diff --git a/packages/bruno-app/src/components/AppView/StyledWrapper.js b/packages/bruno-app/src/components/AppView/StyledWrapper.js
new file mode 100644
index 000000000..5355c7f86
--- /dev/null
+++ b/packages/bruno-app/src/components/AppView/StyledWrapper.js
@@ -0,0 +1,52 @@
+import styled from 'styled-components';
+
+const StyledWrapper = styled.div`
+  display: flex;
+  flex-direction: column;
+  width: 100%;
+  height: 100%;
+  flex-grow: 1;
+  padding: 0.5rem;
+
+  .app-view-toolbar {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 0 0.25rem 0.4rem;
+    font-size: 11px;
+    color: ${(props) => props.theme.colors.text.muted};
+  }
+
+  .app-view-toolbar .app-exit-btn {
+    cursor: pointer;
+    padding: 2px 8px;
+    border: 1px solid ${(props) => props.theme.border.border1};
+    border-radius: 3px;
+    background: transparent;
+    color: ${(props) => props.theme.colors.text.muted};
+
+    &:hover {
+      color: ${(props) => props.theme.text};
+      border-color: ${(props) => props.theme.text};
+    }
+  }
+
+  .app-webview-container {
+    flex: 1 1 0;
+    min-height: 0;
+    display: flex;
+    border: 1px solid ${(props) => props.theme.border.border1};
+    border-radius: 4px;
+    overflow: hidden;
+    background: ${(props) => props.theme.background.surface0};
+  }
+
+  .app-webview {
+    width: 100%;
+    height: 100%;
+    flex: 1 1 0;
+    border: 0;
+  }
+`;
+
+export default StyledWrapper;
diff --git a/packages/bruno-app/src/components/AppView/index.js b/packages/bruno-app/src/components/AppView/index.js
new file mode 100644
index 000000000..af9c682fe
--- /dev/null
+++ b/packages/bruno-app/src/components/AppView/index.js
@@ -0,0 +1,399 @@
+import React, { useRef, useEffect, useCallback, useMemo, useState } from 'react';
+import cloneDeep from 'lodash/cloneDeep';
+import { useDispatch } from 'react-redux';
+import { sendNetworkRequest } from 'utils/network/index';
+import {
+  findEnvironmentInCollection,
+  getEnvironmentVariables,
+  getGlobalEnvironmentVariables
+} from 'utils/collections';
+import { responseReceived, appSetRuntimeVariable, toggleAppMode, initRunRequestEvent } from 'providers/ReduxStore/slices/collections';
+import { uuid } from 'utils/common';
+import { useTheme } from 'providers/Theme';
+import StyledWrapper from './StyledWrapper';
+
+/*
+ * App content runs inside an Electron <webview>, which is an out-of-process guest
+ * with its own document, so it does NOT inherit the app's strict CSP (script-src 'self')
+ * This mirrors the HtmlPreview component used for HTML response previews.
+ *
+ * Messaging (no node integration in the guest, so postMessage/ipc aren't available):
+ *   host  -> guest : webview.executeJavaScript(`window.__brunoReceive(<json>)`)
+ *   guest -> host  : console.log(SENTINEL + json), read via the 'console-message' event
+ */
+const SENTINEL = '__BRUNO_APP_MSG__';
+
+// Encode a value for safe inlining into an executeJavaScript() string as a JS object literal.
+const toJsArg = (value) =>
+  JSON.stringify(value === undefined ? null : value)
+    .replace(/</g, '\\u003c')
+    .replace(/\u2028/g, '\\u2028')
+    .replace(/\u2029/g, '\\u2029');
+
+// The ctx bridge. Injected as early as possible so window.ctx exists before user scripts run.
+const BOOTSTRAP_SCRIPT = `<script>
+(function () {
+  if (window.__brunoBootstrapped) return;
+  window.__brunoBootstrapped = true;
+
+  var SENTINEL = ${JSON.stringify(SENTINEL)};
+  var pending = new Map();
+  var nextRequestId = 0;
+
+  function sendToHost(payload) {
+    try { console.log(SENTINEL + JSON.stringify(payload)); } catch (e) {}
+  }
+
+  var ctx = {
+    theme: 'light',
+    response: null,
+    assertionResults: [],
+    testResults: [],
+    variables: {},
+
+    onThemeChange: null,
+    onResponseUpdate: null,
+    onResultsUpdate: null,
+    onVariablesUpdate: null,
+
+    sendRequest: function (overrides) {
+      return new Promise(function (resolve, reject) {
+        var requestId = ++nextRequestId;
+        pending.set(requestId, { resolve: resolve, reject: reject });
+        sendToHost({ type: 'sendRequest', requestId: requestId, overrides: overrides || {} });
+      });
+    },
+    setRuntimeVariable: function (key, value) {
+      sendToHost({ type: 'setRuntimeVariable', key: String(key), value: value });
+    },
+    log: function () {
+      var args = Array.prototype.slice.call(arguments);
+      sendToHost({ type: 'log', args: args });
+    }
+  };
+  window.ctx = ctx;
+
+  function applyTheme(theme) {
+    ctx.theme = theme || 'light';
+    if (document.body) {
+      document.body.classList.remove('light', 'dark');
+      document.body.classList.add(ctx.theme);
+    }
+  }
+
+  // Host -> guest entry point.
+  window.__brunoReceive = function (msg) {
+    if (!msg) return;
+    switch (msg.type) {
+      case 'state':
+        applyTheme(msg.theme);
+        ctx.response = msg.response || null;
+        ctx.assertionResults = msg.assertionResults || [];
+        ctx.testResults = msg.testResults || [];
+        ctx.variables = msg.variables || {};
+        break;
+      case 'theme':
+        applyTheme(msg.theme);
+        if (typeof ctx.onThemeChange === 'function') ctx.onThemeChange(ctx.theme);
+        break;
+      case 'responseUpdate':
+        ctx.response = msg.response || null;
+        if (typeof ctx.onResponseUpdate === 'function') ctx.onResponseUpdate(ctx.response);
+        break;
+      case 'results':
+        ctx.assertionResults = msg.assertionResults || [];
+        ctx.testResults = msg.testResults || [];
+        if (typeof ctx.onResultsUpdate === 'function') {
+          ctx.onResultsUpdate({ assertionResults: ctx.assertionResults, testResults: ctx.testResults });
+        }
+        break;
+      case 'variables':
+        ctx.variables = msg.variables || {};
+        if (typeof ctx.onVariablesUpdate === 'function') ctx.onVariablesUpdate(ctx.variables);
+        break;
+      case 'response': {
+        var entry = pending.get(msg.requestId);
+        if (!entry) return;
+        pending.delete(msg.requestId);
+        if (msg.error) entry.reject(new Error(msg.error));
+        else entry.resolve(msg.response);
+        break;
+      }
+    }
+  };
+
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', function () { sendToHost({ type: 'ready' }); });
+  } else {
+    sendToHost({ type: 'ready' });
+  }
+})();
+</script>`;
+
+const FRAGMENT_STYLES = `<style>
+  * { box-sizing: border-box; }
+  body {
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+    margin: 0;
+    background: #ffffff;
+    color: #1e1e1e;
+    transition: background-color 0.15s, color 0.15s;
+  }
+  body.dark { background: #1e1e1e; color: #e0e0e0; }
+</style>`;
+
+// User code may be a full HTML document or a fragment. For a full document we inject
+// the bootstrap into it (avoids producing a malformed nested document); a fragment is
+// wrapped in a minimal shell.
+const generateAppHtml = (userCode) => {
+  const code = userCode || '';
+  const isFullDocument = /<html[\s>]/i.test(code) || /<!doctype/i.test(code);
+
+  if (isFullDocument) {
+    if (/<head[^>]*>/i.test(code)) {
+      return code.replace(/<head[^>]*>/i, (m) => `${m}${BOOTSTRAP_SCRIPT}`);
+    }
+    if (/<body[^>]*>/i.test(code)) {
+      return code.replace(/<body[^>]*>/i, (m) => `${m}${BOOTSTRAP_SCRIPT}`);
+    }
+    return `${BOOTSTRAP_SCRIPT}${code}`;
+  }
+
+  return `<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  ${FRAGMENT_STYLES}
+  ${BOOTSTRAP_SCRIPT}
+</head>
+<body>
+${code}
+</body>
+</html>`;
+};
+
+const serializeTimeline = (timeline) => {
+  if (!Array.isArray(timeline)) return timeline;
+  return timeline.map((entry) => ({
+    ...entry,
+    timestamp: entry.timestamp instanceof Date ? entry.timestamp.getTime() : entry.timestamp
+  }));
+};
+
+const projectResponse = (r) => ({
+  status: r?.status ?? null,
+  statusText: r?.statusText ?? null,
+  data: r?.data ?? null,
+  headers: r?.headers ?? null,
+  duration: r?.duration ?? null,
+  size: r?.size ?? null
+});
+
+const buildVariables = (collection) => {
+  const env = getEnvironmentVariables(collection);
+  const global = getGlobalEnvironmentVariables({
+    globalEnvironments: collection?.globalEnvironments || [],
+    activeGlobalEnvironmentUid: collection?.activeGlobalEnvironmentUid
+  });
+  return {
+    ...global,
+    ...env,
+    ...(collection?.collectionVariables || {}),
+    ...(collection?.runtimeVariables || {})
+  };
+};
+
+const AppView = ({ item, collection, code }) => {
+  const dispatch = useDispatch();
+  const { displayedTheme } = useTheme();
+  const webviewRef = useRef(null);
+  const [domReady, setDomReady] = useState(false);
+
+  const src = useMemo(
+    () => `data:text/html;charset=utf-8,${encodeURIComponent(generateAppHtml(code || ''))}`,
+    [code]
+  );
+
+  const environment = useMemo(
+    () => findEnvironmentInCollection(collection, collection.activeEnvironmentUid),
+    [collection]
+  );
+  const variables = useMemo(() => buildVariables(collection), [collection]);
+  const response = useMemo(() => (item.response ? projectResponse(item.response) : null), [item.response]);
+  const assertionResults = useMemo(() => item.assertionResults || [], [item.assertionResults]);
+  const testResults = useMemo(() => item.testResults || [], [item.testResults]);
+
+  // Push a message into the guest. Safe to call before dom-ready (no-op until then).
+  const pushToGuest = useCallback((msg) => {
+    const webview = webviewRef.current;
+    if (!webview || !domReady) return;
+    try {
+      webview.executeJavaScript(`window.__brunoReceive && window.__brunoReceive(${toJsArg(msg)})`).catch(() => {});
+    } catch (_) {
+      /* webview not attached yet */
+    }
+  }, [domReady]);
+
+  const handleSendRequest = useCallback(
+    async (requestId, overrides) => {
+      try {
+        // Mint a requestUid and register the run so the main process emits its
+        // test/assertion/script events against an id the store recognises — this is
+        // what makes ctx.testResults / ctx.assertionResults populate (same as Send).
+        const requestUid = uuid();
+        const requestItem = cloneDeep(item.draft || item);
+        requestItem.requestUid = requestUid;
+        dispatch(initRunRequestEvent({ requestUid, itemUid: item.uid, collectionUid: collection.uid }));
+
+        const flatOverrides = overrides && typeof overrides === 'object' ? { ...overrides } : {};
+        const explicitVars = flatOverrides.variables;
+        delete flatOverrides.variables;
+        const mergedRuntime = {
+          ...(collection.runtimeVariables || {}),
+          ...flatOverrides,
+          ...(explicitVars && typeof explicitVars === 'object' ? explicitVars : {})
+        };
+
+        const result = await sendNetworkRequest(requestItem, collection, environment, mergedRuntime);
+
+        // sendNetworkRequest resolves (rather than rejects) on network/request
+        // errors with an `error` payload — surface that to the guest as a rejection.
+        if (result?.error) {
+          const errorMessage = typeof result.error === 'string'
+            ? result.error
+            : result.error?.message || 'Request failed';
+          pushToGuest({ type: 'response', requestId, error: errorMessage });
+          return;
+        }
+
+        dispatch(
+          responseReceived({
+            itemUid: item.uid,
+            collectionUid: collection.uid,
+            response: {
+              status: result.status,
+              statusText: result.statusText,
+              headers: result.headers,
+              data: result.data,
+              dataBuffer: result.dataBuffer,
+              size: result.size,
+              duration: result.duration,
+              timeline: serializeTimeline(result.timeline)
+            }
+          })
+        );
+
+        pushToGuest({ type: 'response', requestId, response: projectResponse(result) });
+      } catch (err) {
+        pushToGuest({ type: 'response', requestId, error: err?.message || 'Request failed' });
+      }
+    },
+    [item, collection, environment, dispatch, pushToGuest]
+  );
+
+  const handleGuestMessage = useCallback(
+    (data) => {
+      switch (data?.type) {
+        case 'ready':
+          // Readiness is tracked via the webview 'dom-ready' event; nothing to do here.
+          break;
+        case 'sendRequest':
+          handleSendRequest(data.requestId, data.overrides);
+          break;
+        case 'setRuntimeVariable':
+          if (typeof data.key === 'string' && data.key.length) {
+            dispatch(appSetRuntimeVariable({ collectionUid: collection.uid, key: data.key, value: data.value }));
+          }
+          break;
+        case 'log':
+          console.log('[app]', ...(data.args || []));
+          break;
+        default:
+          break;
+      }
+    },
+    [handleSendRequest, dispatch, collection.uid]
+  );
+
+  useEffect(() => {
+    const webview = webviewRef.current;
+    if (!webview) return;
+
+    const onConsoleMessage = (e) => {
+      const text = e?.message;
+      if (typeof text !== 'string' || !text.startsWith(SENTINEL)) return;
+      try {
+        handleGuestMessage(JSON.parse(text.slice(SENTINEL.length)));
+      } catch (_) {
+        /* not our message */
+      }
+    };
+    // executeJavaScript() is only valid after Electron's 'dom-ready'; gate on that.
+    // A reload (e.g. code change) tears the guest down, so reset readiness then.
+    const onDomReady = () => setDomReady(true);
+    const onStartLoading = () => setDomReady(false);
+
+    webview.addEventListener('console-message', onConsoleMessage);
+    webview.addEventListener('dom-ready', onDomReady);
+    webview.addEventListener('did-start-loading', onStartLoading);
+
+    return () => {
+      webview.removeEventListener('console-message', onConsoleMessage);
+      webview.removeEventListener('dom-ready', onDomReady);
+      webview.removeEventListener('did-start-loading', onStartLoading);
+    };
+  }, [handleGuestMessage]);
+
+  // Push initial state once the guest signals ready (also after a reload).
+  // Push a full state snapshot on the readiness transition (initial load and after reloads).
+  // Subsequent changes are handled by the granular effects below.
+  const stateRef = useRef();
+  stateRef.current = { theme: displayedTheme, response, assertionResults, testResults, variables };
+  useEffect(() => {
+    if (!domReady) return;
+    pushToGuest({ type: 'state', ...stateRef.current });
+  }, [domReady, pushToGuest]);
+
+  useEffect(() => {
+    pushToGuest({ type: 'theme', theme: displayedTheme });
+  }, [displayedTheme, pushToGuest]);
+
+  useEffect(() => {
+    pushToGuest({ type: 'responseUpdate', response });
+  }, [response, pushToGuest]);
+
+  useEffect(() => {
+    pushToGuest({ type: 'results', assertionResults, testResults });
+  }, [assertionResults, testResults, pushToGuest]);
+
+  useEffect(() => {
+    pushToGuest({ type: 'variables', variables });
+  }, [variables, pushToGuest]);
+
+  const disableApp = useCallback(() => {
+    dispatch(toggleAppMode({ enabled: false, itemUid: item.uid, collectionUid: collection.uid }));
+  }, [dispatch, item.uid, collection.uid]);
+
+  return (
+    <StyledWrapper data-testid="app-view">
+      <div className="app-view-toolbar">
+        <span>App mode - {item.name}</span>
+        <button type="button" className="app-exit-btn" data-testid="app-exit-button" onClick={disableApp}>
+          Exit to editor
+        </button>
+      </div>
+      <div className="app-webview-container">
+        <webview
+          ref={webviewRef}
+          src={src}
+          partition="persist:bruno-app-view"
+          webpreferences="disableDialogs=true, javascript=yes"
+          className="app-webview"
+        />
+      </div>
+    </StyledWrapper>
+  );
+};
+
+export default AppView;
diff --git a/packages/bruno-app/src/components/RequestPane/AppCodeEditor/StyledWrapper.js b/packages/bruno-app/src/components/RequestPane/AppCodeEditor/StyledWrapper.js
new file mode 100644
index 000000000..59ff15653
--- /dev/null
+++ b/packages/bruno-app/src/components/RequestPane/AppCodeEditor/StyledWrapper.js
@@ -0,0 +1,15 @@
+import styled from 'styled-components';
+
+const StyledWrapper = styled.div`
+  .app-toggle-row {
+    border-bottom: 1px solid ${(props) => props.theme.border.border1};
+  }
+
+  .app-editor {
+    div.CodeMirror {
+      height: inherit;
+    }
+  }
+`;
+
+export default StyledWrapper;
diff --git a/packages/bruno-app/src/components/RequestPane/AppCodeEditor/index.js b/packages/bruno-app/src/components/RequestPane/AppCodeEditor/index.js
new file mode 100644
index 000000000..320d72761
--- /dev/null
+++ b/packages/bruno-app/src/components/RequestPane/AppCodeEditor/index.js
@@ -0,0 +1,55 @@
+import React from 'react';
+import get from 'lodash/get';
+import { useDispatch, useSelector } from 'react-redux';
+import CodeEditor from 'components/CodeEditor';
+import ToggleSwitch from 'components/ToggleSwitch';
+import { updateAppCode, toggleAppMode } from 'providers/ReduxStore/slices/collections';
+import { saveRequest } from 'providers/ReduxStore/slices/collections/actions';
+import { useTheme } from 'providers/Theme';
+import StyledWrapper from './StyledWrapper';
+
+const AppCodeEditor = ({ item, collection }) => {
+  const dispatch = useDispatch();
+  const { displayedTheme } = useTheme();
+  const preferences = useSelector((state) => state.app.preferences);
+
+  const code = item.draft ? get(item, 'draft.app.code', '') : get(item, 'app.code', '');
+  const enabled = item.draft ? get(item, 'draft.app.enabled', false) : get(item, 'app.enabled', false);
+
+  const onEdit = (value) =>
+    dispatch(updateAppCode({ code: value, itemUid: item.uid, collectionUid: collection.uid }));
+
+  const onToggle = () =>
+    dispatch(toggleAppMode({ enabled: !enabled, itemUid: item.uid, collectionUid: collection.uid }));
+
+  const onSave = () => dispatch(saveRequest(item.uid, collection.uid));
+
+  return (
+    <StyledWrapper className="w-full h-full flex flex-col">
+      <div className="app-toggle-row mb-3 px-1 pb-3 flex items-center justify-between">
+        <div className="flex flex-col">
+          <label className="text-xs font-medium">Enable App</label>
+          <p className="text-xs opacity-70">
+            When enabled, replaces the request/response panes with the app view for this request.
+          </p>
+        </div>
+        <ToggleSwitch isOn={enabled} handleToggle={onToggle} size="m" data-testid="app-enable-toggle" />
+      </div>
+
+      <div className="flex-1 app-editor" data-testid="app-code-editor">
+        <CodeEditor
+          collection={collection}
+          value={code || ''}
+          theme={displayedTheme}
+          font={get(preferences, 'font.codeFont', 'default')}
+          fontSize={get(preferences, 'font.codeFontSize')}
+          onEdit={onEdit}
+          onSave={onSave}
+          mode="javascript"
+        />
+      </div>
+    </StyledWrapper>
+  );
+};
+
+export default AppCodeEditor;
diff --git a/packages/bruno-app/src/components/RequestPane/HttpRequestPane/index.js b/packages/bruno-app/src/components/RequestPane/HttpRequestPane/index.js
index a0621adb2..596bd9e71 100644
--- a/packages/bruno-app/src/components/RequestPane/HttpRequestPane/index.js
+++ b/packages/bruno-app/src/components/RequestPane/HttpRequestPane/index.js
@@ -13,6 +13,7 @@ import Assertions from 'components/RequestPane/Assertions';
 import Script from 'components/RequestPane/Script';
 import Tests from 'components/RequestPane/Tests';
 import Settings from 'components/RequestPane/Settings';
+import AppCodeEditor from 'components/RequestPane/AppCodeEditor';
 import Documentation from 'components/Documentation/index';
 import StatusDot from 'components/StatusDot';
 import ResponsiveTabs from 'ui/ResponsiveTabs';
@@ -30,6 +31,7 @@ const TAB_CONFIG = [
   { key: 'assert', label: 'Assert' },
   { key: 'tests', label: 'Tests' },
   { key: 'docs', label: 'Docs' },
+  { key: 'app', label: 'App' },
   { key: 'settings', label: 'Settings' }
 ];
 
@@ -43,6 +45,7 @@ const TAB_PANELS = {
   script: Script,
   tests: Tests,
   docs: Documentation,
+  app: AppCodeEditor,
   settings: Settings
 };
 
@@ -71,6 +74,7 @@ const HttpRequestPane = ({ item, collection }) => {
   const responseVars = getProperty('request.vars.res');
   const auth = getProperty('request.auth');
   const tags = getProperty('tags');
+  const app = item.draft ? get(item, 'draft.app') : get(item, 'app');
 
   const activeCounts = useMemo(() => ({
     params: params.filter((p) => p.enabled).length,
@@ -106,9 +110,10 @@ const HttpRequestPane = ({ item, collection }) => {
       assert: activeCounts.assertions > 0 ? <sup className="font-medium">{activeCounts.assertions}</sup> : null,
       tests: tests?.length > 0 ? (hasTestError ? <StatusDot type="error" /> : <StatusDot />) : null,
       docs: docs?.length > 0 ? <StatusDot /> : null,
+      app: app?.code?.length > 0 ? <StatusDot dataTestId="app" /> : null,
       settings: tags?.length > 0 ? <StatusDot /> : null
     };
-  }, [activeCounts, body.mode, hasAuth, script, item.preRequestScriptErrorMessage, item.postResponseScriptErrorMessage, item.testScriptErrorMessage, tests, docs, tags]);
+  }, [activeCounts, body.mode, hasAuth, script, item.preRequestScriptErrorMessage, item.postResponseScriptErrorMessage, item.testScriptErrorMessage, tests, docs, app, tags]);
 
   const allTabs = useMemo(
     () => TAB_CONFIG.map(({ key, label }) => ({ key, label, indicator: indicators[key] })),
diff --git a/packages/bruno-app/src/components/RequestTabPanel/index.js b/packages/bruno-app/src/components/RequestTabPanel/index.js
index 50af42aaa..359e962be 100644
--- a/packages/bruno-app/src/components/RequestTabPanel/index.js
+++ b/packages/bruno-app/src/components/RequestTabPanel/index.js
@@ -1,5 +1,6 @@
 import React, { useState, useEffect, useRef, useCallback, useMemo } from 'react';
 import find from 'lodash/find';
+import get from 'lodash/get';
 import toast from 'react-hot-toast';
 import { useSelector, useDispatch } from 'react-redux';
 import GraphQLRequestPane from 'components/RequestPane/GraphQLRequestPane';
@@ -20,6 +21,7 @@ import CollectionSettings from 'components/CollectionSettings';
 import { DocExplorer } from '@usebruno/graphql-docs';
 
 import FileEditor from 'components/FileEditor';
+import AppView from 'components/AppView';
 import StyledWrapper from './StyledWrapper';
 import FolderSettings from 'components/FolderSettings';
 import { getGlobalEnvironmentVariables, getGlobalEnvironmentVariablesMasked } from 'utils/collections/index';
@@ -493,6 +495,18 @@ const RequestTabPanel = () => {
     );
   }
 
+  const appEnabled = item.draft ? get(item, 'draft.app.enabled', false) : get(item, 'app.enabled', false);
+  if (appEnabled) {
+    const appCode = item.draft ? get(item, 'draft.app.code', '') : get(item, 'app.code', '');
+    return (
+      <ScopedPersistenceProvider scope={focusedTab.uid}>
+        <StyledWrapper className="flex flex-col flex-grow relative overflow-hidden">
+          <AppView item={item} collection={collection} code={appCode} />
+        </StyledWrapper>
+      </ScopedPersistenceProvider>
+    );
+  }
+
   const renderQueryUrl = () => {
     if (isGrpcRequest) {
       return <GrpcQueryUrl item={item} collection={collection} handleRun={handleRun} />;
diff --git a/packages/bruno-app/src/components/RequestTabs/CollectionHeader/StyledWrapper.js b/packages/bruno-app/src/components/RequestTabs/CollectionHeader/StyledWrapper.js
index 599c773ac..e2947d265 100644
--- a/packages/bruno-app/src/components/RequestTabs/CollectionHeader/StyledWrapper.js
+++ b/packages/bruno-app/src/components/RequestTabs/CollectionHeader/StyledWrapper.js
@@ -215,6 +215,44 @@ const StyledWrapper = styled.div`
       border-radius: ${(props) => props.theme.border.radius.sm}
     }
   }
+
+  .mode-toggle {
+    display: flex;
+    align-items: center;
+    height: 24px;
+    border: 1px solid ${(props) => props.theme.input.border};
+    border-radius: ${(props) => props.theme.border.radius.base};
+    overflow: hidden;
+
+    .mode-btn {
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      width: 28px;
+      height: 100%;
+      padding: 0;
+      border: none;
+      border-right: 1px solid ${(props) => props.theme.input.border};
+      background: transparent;
+      color: ${(props) => props.theme.colors.text.muted};
+      cursor: pointer;
+      transition: background 0.15s ease, color 0.15s ease;
+
+      &:last-child {
+        border-right: none;
+      }
+
+      &:hover:not(.active) {
+        background: ${(props) => props.theme.sidebar.collection.item.hoverBg};
+        color: ${(props) => props.theme.text};
+      }
+
+      &.active {
+        background: ${(props) => props.theme.sidebar.collection.item.hoverBg};
+        color: ${(props) => props.theme.primary.text};
+      }
+    }
+  }
 `;
 
 export default StyledWrapper;
diff --git a/packages/bruno-app/src/components/RequestTabs/CollectionHeader/index.js b/packages/bruno-app/src/components/RequestTabs/CollectionHeader/index.js
index 0744ace4e..0b28f5586 100644
--- a/packages/bruno-app/src/components/RequestTabs/CollectionHeader/index.js
+++ b/packages/bruno-app/src/components/RequestTabs/CollectionHeader/index.js
@@ -15,13 +15,18 @@ import {
   IconUpload,
   IconFileCode,
   IconFileOff,
+  IconCode,
+  IconApps,
   IconTransform
 } from '@tabler/icons';
 import OpenAPISyncIcon from 'components/Icons/OpenAPISync';
 import { switchWorkspace, renameWorkspaceAction, exportWorkspaceAction, confirmWorkspaceCreation, cancelWorkspaceCreation } from 'providers/ReduxStore/slices/workspaces/actions';
 import { updateWorkspace } from 'providers/ReduxStore/slices/workspaces';
 import { showInFolder } from 'providers/ReduxStore/slices/collections/actions';
-import { toggleCollectionFileMode, updateSettingsSelectedTab } from 'providers/ReduxStore/slices/collections';
+import { toggleCollectionFileMode, toggleAppMode, updateSettingsSelectedTab } from 'providers/ReduxStore/slices/collections';
+import { findItemInCollection, findItemInCollectionByPathname } from 'utils/collections';
+import find from 'lodash/find';
+import get from 'lodash/get';
 import { addTab, focusTab } from 'providers/ReduxStore/slices/tabs';
 import { uuid } from 'utils/common';
 import toast from 'react-hot-toast';
@@ -58,11 +63,29 @@ const CollectionHeader = ({ collection, isScratchCollection }) => {
   const activeWorkspaceUid = useSelector((state) => state.workspaces.activeWorkspaceUid);
   const collections = useSelector((state) => state.collections.collections);
   const tabs = useSelector((state) => state.tabs.tabs);
+  const activeTabUid = useSelector((state) => state.tabs.activeTabUid);
 
   // Get the current active workspace
   const currentWorkspace = workspaces.find((w) => w.uid === activeWorkspaceUid);
   const gitRootPath = collection?.git?.gitRootPath;
 
+  // Active request (used by the Request / App / File view-mode toggle)
+  const focusedTab = find(tabs, (t) => t.uid === activeTabUid);
+  const activeItem = focusedTab && collection
+    ? (findItemInCollection(collection, activeTabUid)
+      || (focusedTab.pathname ? findItemInCollectionByPathname(collection, focusedTab.pathname) : null))
+    : null;
+  const isHttpRequestActive = activeItem?.type === 'http-request';
+  const appEnabled = activeItem
+    ? (activeItem.draft ? get(activeItem, 'draft.app.enabled', false) : get(activeItem, 'app.enabled', false))
+    : false;
+
+  const handleToggleAppMode = (enabled) => {
+    if (isHttpRequestActive) {
+      dispatch(toggleAppMode({ enabled, itemUid: activeItem.uid, collectionUid: collection.uid }));
+    }
+  };
+
   // Workspace rename state
   const [isRenamingWorkspace, setIsRenamingWorkspace] = useState(false);
   const [workspaceNameInput, setWorkspaceNameInput] = useState('');
@@ -277,7 +300,11 @@ const CollectionHeader = ({ collection, isScratchCollection }) => {
   // Build overflow menu items for the "..." dropdown
   const overflowMenuItems = [
     { id: 'variables', label: 'Variables', leftSection: IconEye, onClick: viewVariables },
-    { id: 'file-mode', label: collection.fileMode ? 'Switch to Code Mode' : 'Switch to File Mode', leftSection: collection.fileMode ? IconFileOff : IconFileCode, onClick: handleFileModeClick },
+    // File mode is exposed via the Request/App/File view-mode toggle when a request is active;
+    // keep it in the overflow as a fallback for non-request contexts.
+    ...(!isHttpRequestActive
+      ? [{ id: 'file-mode', label: collection.fileMode ? 'Switch to Code Mode' : 'Switch to File Mode', leftSection: collection.fileMode ? IconFileOff : IconFileCode, onClick: handleFileModeClick }]
+      : []),
     ...(!hasOpenApiSyncConfigured
       ? [{ id: 'openapi-sync', label: 'OpenAPI', leftSection: OpenAPISyncIcon, onClick: viewOpenApiSync }]
       : []),
@@ -630,6 +657,48 @@ const CollectionHeader = ({ collection, isScratchCollection }) => {
         {/* Right side: Actions (only for regular collections) */}
         {!isScratchCollection && (
           <div className="flex flex-grow gap-1.5 items-center justify-end">
+            {isHttpRequestActive && (
+              <ToolHint text="Switch view mode" toolhintId="ViewModeToggleToolhintId" place="bottom">
+                <div className="mode-toggle" data-testid="view-mode-toggle">
+                  <button
+                    type="button"
+                    data-testid="view-mode-request"
+                    className={`mode-btn ${!appEnabled && !collection.fileMode ? 'active' : ''}`}
+                    onClick={() => {
+                      if (collection.fileMode) handleFileModeClick();
+                      if (appEnabled) handleToggleAppMode(false);
+                    }}
+                    title="Request"
+                  >
+                    <IconCode size={16} strokeWidth={1.5} />
+                  </button>
+                  <button
+                    type="button"
+                    data-testid="view-mode-app"
+                    className={`mode-btn ${appEnabled && !collection.fileMode ? 'active' : ''}`}
+                    onClick={() => {
+                      if (collection.fileMode) handleFileModeClick();
+                      if (!appEnabled) handleToggleAppMode(true);
+                    }}
+                    title="App"
+                  >
+                    <IconApps size={16} strokeWidth={1.5} />
+                  </button>
+                  <button
+                    type="button"
+                    data-testid="view-mode-file"
+                    className={`mode-btn ${collection.fileMode ? 'active' : ''}`}
+                    onClick={() => {
+                      if (appEnabled) handleToggleAppMode(false);
+                      if (!collection.fileMode) handleFileModeClick();
+                    }}
+                    title="File"
+                  >
+                    <IconFileCode size={16} strokeWidth={1.5} />
+                  </button>
+                </div>
+              </ToolHint>
+            )}
             {collection.format === 'bru' && !migratePillDismissed && (
               <div
                 className="migrate-yml-pill"
diff --git a/packages/bruno-app/src/providers/ReduxStore/middlewares/autosave/middleware.js b/packages/bruno-app/src/providers/ReduxStore/middlewares/autosave/middleware.js
index e12c0b36b..265605204 100644
--- a/packages/bruno-app/src/providers/ReduxStore/middlewares/autosave/middleware.js
+++ b/packages/bruno-app/src/providers/ReduxStore/middlewares/autosave/middleware.js
@@ -45,6 +45,7 @@ const actionsToIntercept = [
   'collections/deleteVar',
   'collections/moveVar',
   'collections/updateRequestDocs',
+  'collections/updateAppCode',
   'collections/runRequestEvent',
   'collections/updateCollectionPresets',
   'collections/setRequestVars',
diff --git a/packages/bruno-app/src/providers/ReduxStore/slices/collections/index.js b/packages/bruno-app/src/providers/ReduxStore/slices/collections/index.js
index 545cdaa1d..0818b5e26 100644
--- a/packages/bruno-app/src/providers/ReduxStore/slices/collections/index.js
+++ b/packages/bruno-app/src/providers/ReduxStore/slices/collections/index.js
@@ -845,6 +845,9 @@ export const collectionsSlice = createSlice({
           if (item.draft.settings) {
             item.settings = item.draft.settings;
           }
+          if (item.draft.app) {
+            item.app = item.draft.app;
+          }
           item.draft = null;
         }
       }
@@ -2842,6 +2845,7 @@ export const collectionsSlice = createSlice({
               request: file.data.request,
               settings: file.data.settings,
               examples: file.data.examples,
+              app: file.data.app,
               filename: file.meta.name,
               pathname: file.meta.pathname,
               raw: file.data.raw,
@@ -2945,6 +2949,16 @@ export const collectionsSlice = createSlice({
             item.request = mergeRequestWithPreservedUids(item.request, file.data.request);
             item.settings = file.data.settings;
             item.examples = file.data.examples;
+            // app.enabled is runtime-only and not persisted, so preserve it across file reloads
+            // even when the file no longer has an `app` block on disk.
+            const currentEnabled = item.draft?.app?.enabled ?? item.app?.enabled ?? false;
+            if (file.data.app) {
+              item.app = { ...file.data.app, enabled: currentEnabled };
+            } else if (currentEnabled) {
+              item.app = { code: null, enabled: true };
+            } else {
+              item.app = null;
+            }
             item.filename = file.meta.name;
             item.pathname = file.meta.pathname;
             item.raw = file.data.raw;
@@ -3371,6 +3385,39 @@ export const collectionsSlice = createSlice({
         }
       }
     },
+    updateAppCode: (state, action) => {
+      const collection = findCollectionByUid(state.collections, action.payload.collectionUid);
+      if (!collection) return;
+
+      const item = findItemInCollection(collection, action.payload.itemUid);
+      if (item && isItemARequest(item)) {
+        if (!item.draft) {
+          item.draft = cloneDeep(item);
+        }
+        item.draft.app = item.draft.app || {};
+        item.draft.app.code = action.payload.code;
+      }
+    },
+    toggleAppMode: (state, action) => {
+      const collection = findCollectionByUid(state.collections, action.payload.collectionUid);
+      if (!collection) return;
+
+      const item = findItemInCollection(collection, action.payload.itemUid);
+      if (item && isItemARequest(item)) {
+        item.app = item.app || {};
+        item.app.enabled = action.payload.enabled;
+        if (item.draft) {
+          item.draft.app = item.draft.app || {};
+          item.draft.app.enabled = action.payload.enabled;
+        }
+      }
+    },
+    appSetRuntimeVariable: (state, action) => {
+      const { collectionUid, key, value } = action.payload;
+      const collection = findCollectionByUid(state.collections, collectionUid);
+      if (!collection) return;
+      collection.runtimeVariables = { ...(collection.runtimeVariables || {}), [key]: value };
+    },
     updateFolderDocs: (state, action) => {
       const collection = findCollectionByUid(state.collections, action.payload.collectionUid);
       const folder = collection ? findItemInCollection(collection, action.payload.folderUid) : null;
@@ -3961,6 +4008,9 @@ export const {
   updateFolderDocs,
   toggleCollectionFileMode,
   updateFileContent,
+  updateAppCode,
+  toggleAppMode,
+  appSetRuntimeVariable,
   moveCollection,
   streamDataReceived,
   collectionAddOauth2CredentialsByUrl,
diff --git a/packages/bruno-app/src/utils/collections/index.js b/packages/bruno-app/src/utils/collections/index.js
index 8599b3ba1..73eeba8af 100644
--- a/packages/bruno-app/src/utils/collections/index.js
+++ b/packages/bruno-app/src/utils/collections/index.js
@@ -704,6 +704,10 @@ export const transformRequestToSaveToFilesystem = (item) => {
     }));
   };
 
+  const appToSave = _item.app && _item.app.code && _item.app.code.length
+    ? { code: _item.app.code }
+    : null;
+
   const itemToSave = {
     uid: _item.uid,
     type: _item.type,
@@ -711,6 +715,7 @@ export const transformRequestToSaveToFilesystem = (item) => {
     seq: _item.seq,
     settings: _item.settings,
     tags: _item.tags,
+    app: appToSave,
     examples: transformExamples(_item.examples || []),
     request: {
       method: _item.request.method,
diff --git a/packages/bruno-filestore/src/formats/bru/index.ts b/packages/bruno-filestore/src/formats/bru/index.ts
index db89329a0..100e443ff 100644
--- a/packages/bruno-filestore/src/formats/bru/index.ts
+++ b/packages/bruno-filestore/src/formats/bru/index.ts
@@ -38,11 +38,16 @@ export const parseBruRequest = (data: string | any, parsed: boolean = false): an
       'ws-request': 'ws.url',
       'default': 'http.url'
     };
+
+    const appData = _.get(json, 'app');
+    const app = appData ? { code: _.get(appData, 'code', null) } : null;
+
     const transformedJson = {
       type: requestType,
       name: _.get(json, 'meta.name'),
       seq: !_.isNaN(sequence) ? Number(sequence) : 1,
       settings: _.get(json, 'settings', {}),
+      app,
       tags: Array.isArray(tags) ? tags : [],
       request: {
         // Preserving special characters in custom methods. Using _.upperCase strips special characters.
@@ -221,6 +226,11 @@ export const stringifyBruRequest = (json: any): string => {
     bruJson.docs = _.get(json, 'request.docs', '');
     bruJson.examples = _.get(json, 'examples', []).map((e: any) => jsonExampleToBru(e));
 
+    const app = _.get(json, 'app');
+    if (app && app.code && app.code.length) {
+      bruJson.app = { code: app.code };
+    }
+
     const bru = jsonToBruV2(bruJson);
     return bru;
   } catch (error) {
diff --git a/packages/bruno-filestore/src/formats/yml/common/app.ts b/packages/bruno-filestore/src/formats/yml/common/app.ts
new file mode 100644
index 000000000..403da7875
--- /dev/null
+++ b/packages/bruno-filestore/src/formats/yml/common/app.ts
@@ -0,0 +1,18 @@
+import type { App as BrunoApp } from '@usebruno/schema-types/collection/item';
+
+export interface OpenCollectionApp {
+  code?: string;
+}
+
+export const toOpenCollectionApp = (app: BrunoApp | null | undefined): OpenCollectionApp | undefined => {
+  if (!app || !app.code) return undefined;
+  return { code: app.code };
+};
+
+export const toBrunoApp = (app: OpenCollectionApp | null | undefined): BrunoApp | null => {
+  if (!app) return null;
+  return {
+    enabled: false,
+    code: app.code || null
+  };
+};
diff --git a/packages/bruno-filestore/src/formats/yml/items/parseHttpRequest.ts b/packages/bruno-filestore/src/formats/yml/items/parseHttpRequest.ts
index e734db994..ce502af10 100644
--- a/packages/bruno-filestore/src/formats/yml/items/parseHttpRequest.ts
+++ b/packages/bruno-filestore/src/formats/yml/items/parseHttpRequest.ts
@@ -9,6 +9,7 @@ import { toBrunoVariables } from '../common/variables';
 import { toBrunoPostResponseVariables } from '../common/actions';
 import { toBrunoScripts } from '../common/scripts';
 import { toBrunoAssertions } from '../common/assertions';
+import { toBrunoApp } from '../common/app';
 import { uuid, ensureString } from '../../../utils';
 
 const parseHttpRequest = (ocRequest: HttpRequest): BrunoItem => {
@@ -79,6 +80,9 @@ const parseHttpRequest = (ocRequest: HttpRequest): BrunoItem => {
     brunoRequest.docs = ocRequest.docs;
   }
 
+  // app
+  const app = toBrunoApp((ocRequest as any).app);
+
   // bruno item
   const brunoItem: BrunoItem = {
     uid: uuid(),
@@ -88,6 +92,7 @@ const parseHttpRequest = (ocRequest: HttpRequest): BrunoItem => {
     tags: info?.tags || [],
     request: brunoRequest,
     settings: null,
+    app,
     fileContent: null,
     root: null,
     items: [],
diff --git a/packages/bruno-filestore/src/formats/yml/items/stringifyHttpRequest.ts b/packages/bruno-filestore/src/formats/yml/items/stringifyHttpRequest.ts
index 35cb03eca..a23305b4b 100644
--- a/packages/bruno-filestore/src/formats/yml/items/stringifyHttpRequest.ts
+++ b/packages/bruno-filestore/src/formats/yml/items/stringifyHttpRequest.ts
@@ -8,6 +8,7 @@ import type { Assertion } from '@opencollection/types/common/assertions';
 import type { Action } from '@opencollection/types/common/actions';
 import type { HttpRequestParam, HttpRequestBody } from '@opencollection/types/requests/http';
 import { stringifyYml } from '../utils';
+import { toOpenCollectionApp, OpenCollectionApp } from '../common/app';
 import { toOpenCollectionAuth } from '../common/auth';
 import { toOpenCollectionHttpHeaders, toOpenCollectionResponseHeaders } from '../common/headers';
 import { toOpenCollectionParams } from '../common/params';
@@ -212,6 +213,12 @@ const stringifyHttpRequest = (item: BrunoItem): string => {
       ocRequest.docs = brunoRequest.docs;
     }
 
+    // app
+    const app: OpenCollectionApp | undefined = toOpenCollectionApp(item.app);
+    if (app) {
+      (ocRequest as any).app = app;
+    }
+
     return stringifyYml(ocRequest);
   } catch (error) {
     console.error('Error stringifying HTTP request:', error);
diff --git a/packages/bruno-lang/v2/src/bruToJson.js b/packages/bruno-lang/v2/src/bruToJson.js
index 106cd55ca..f62ad9737 100644
--- a/packages/bruno-lang/v2/src/bruToJson.js
+++ b/packages/bruno-lang/v2/src/bruToJson.js
@@ -34,7 +34,7 @@ const ANNOTATIONS_KEY = Symbol('annotations');
  *
  */
 const grammar = ohm.grammar(`Bru {
-  BruFile = (meta | http | grpc | ws | query | params | headers | metadata | auths | bodies | varsandassert | script | tests | settings | docs | example)*
+  BruFile = (meta | http | grpc | ws | query | params | headers | metadata | auths | bodies | varsandassert | script | tests | app | settings | docs | example)*
   auths = authawsv4 | authbasic | authbearer | authdigest | authNTLM | authOAuth1 | authOAuth2 | authwsse | authapikey | authOauth2Configs
   bodies = bodyjson | bodytext | bodyxml | bodysparql | bodygraphql | bodygraphqlvars | bodyforms | body | bodygrpc | bodyws
   bodyforms = bodyformurlencoded | bodymultipart | bodyfile
@@ -108,6 +108,7 @@ const grammar = ohm.grammar(`Bru {
   listitem = st+ (alnum | "_" | "-")+ st*
 
   meta = "meta" dictionary
+  app = "app" dictionary
   settings = "settings" dictionary
 
   http = get | post | put | delete | patch | options | head | connect | trace | httpcustom
@@ -522,6 +523,14 @@ const sem = grammar.createSemantics().addAttribute('ast', {
       meta
     };
   },
+  app(_1, dictionary) {
+    const appData = mapPairListToKeyValPair(dictionary.ast);
+    return {
+      app: {
+        code: appData.code || null
+      }
+    };
+  },
   settings(_1, dictionary) {
     let settings = mapPairListToKeyValPair(dictionary.ast);
     const getNumFromRecord = createGetNumFromRecord(settings);
diff --git a/packages/bruno-lang/v2/src/jsonToBru.js b/packages/bruno-lang/v2/src/jsonToBru.js
index f78e756c9..654c02f34 100644
--- a/packages/bruno-lang/v2/src/jsonToBru.js
+++ b/packages/bruno-lang/v2/src/jsonToBru.js
@@ -14,7 +14,7 @@ const stripLastLine = (text) => {
 };
 
 const jsonToBru = (json) => {
-  const { meta, http, grpc, ws, params, headers, metadata, auth, body, script, tests, vars, assertions, settings, docs, examples } = json;
+  const { meta, http, grpc, ws, params, headers, metadata, auth, body, script, tests, vars, assertions, settings, app, docs, examples } = json;
 
   let bru = '';
 
@@ -757,6 +757,12 @@ ${indentString(tests)}
 `;
   }
 
+  if (app && app.code && app.code.length) {
+    bru += `app {\n`;
+    bru += `  code: '''\n${indentString(app.code, 2)}\n  '''`;
+    bru += '\n}\n\n';
+  }
+
   if (settings && Object.keys(settings).length) {
     bru += 'settings {\n';
     for (const key in settings) {
diff --git a/packages/bruno-schema-types/src/collection/item.ts b/packages/bruno-schema-types/src/collection/item.ts
index bdf3b3346..00aa1dabf 100644
--- a/packages/bruno-schema-types/src/collection/item.ts
+++ b/packages/bruno-schema-types/src/collection/item.ts
@@ -27,6 +27,11 @@ export interface WebSocketItemSettings {
 
 export type ItemSettings = HttpItemSettings | WebSocketItemSettings | null;
 
+export interface App {
+  code?: string | null;
+  enabled?: boolean | null;
+}
+
 export interface Item {
   uid: UID;
   type: ItemType;
@@ -35,6 +40,7 @@ export interface Item {
   tags?: string[] | null;
   request?: Request | null;
   settings?: ItemSettings;
+  app?: App | null;
   fileContent?: string | null;
   root?: FolderRoot | null;
   items?: Item[] | null;
diff --git a/packages/bruno-schema/src/collections/index.js b/packages/bruno-schema/src/collections/index.js
index f93121a76..a997c96a4 100644
--- a/packages/bruno-schema/src/collections/index.js
+++ b/packages/bruno-schema/src/collections/index.js
@@ -684,6 +684,11 @@ const itemSchema = Yup.object({
     then: (schema) => schema.nullable(),
     otherwise: Yup.array().strip()
   }),
+  app: Yup.object({
+    code: Yup.string().nullable()
+  })
+    .noUnknown(true)
+    .nullable(),
   filename: Yup.string().nullable(),
   pathname: Yup.string().nullable()
 })
diff --git a/tests/apps/apps-ctx-api.spec.ts b/tests/apps/apps-ctx-api.spec.ts
new file mode 100644
index 000000000..44ce96503
--- /dev/null
+++ b/tests/apps/apps-ctx-api.spec.ts
@@ -0,0 +1,212 @@
+import { test, expect, ElectronApplication } from '../../playwright';
+import {
+  createCollection,
+  createRequest,
+  openRequest,
+  setAppCode,
+  enableApp,
+  saveRequest,
+  selectRequestBodyMode,
+  getAppWebviewHtml
+} from '../utils/page';
+
+/*
+ * The app runs inside an out-of-process <webview> guest, so we can't reach it
+ * through the renderer page. Instead we evaluate in the Electron main process,
+ * locate the guest WebContents, and run JS inside it.
+ */
+const guestEval = (electronApp: ElectronApplication, code: string) =>
+  electronApp.evaluate(async ({ webContents }, c) => {
+    // The app view loads from a data:text/html URL. Filtering on that keeps us
+    // bound to the app guest even if other webviews (e.g. HTML response preview)
+    // are present.
+    const guest = webContents.getAllWebContents().find((wc) => {
+      try {
+        return wc.getType() === 'webview' && (wc.getURL() || '').startsWith('data:text/html');
+      } catch {
+        return false;
+      }
+    });
+    if (!guest) return undefined;
+    return await guest.executeJavaScript(c, true);
+  }, code);
+
+const waitForGuestReady = async (electronApp: ElectronApplication) => {
+  await expect
+    .poll(async () => guestEval(electronApp, 'typeof window.ctx'), { timeout: 15000 })
+    .toBe('object');
+};
+
+const guestResult = (electronApp: ElectronApplication) =>
+  guestEval(electronApp, `document.getElementById('out') && document.getElementById('out').getAttribute('data-result')`);
+
+// A fragment app exposing helpers the host-side test can invoke in the guest.
+// It echoes the resolved `q` field from the response body into `#out[data-result]`.
+const CTX_APP = `
+<div id="out" data-result="pending">pending</div>
+<script>
+  window.__send = function (overrides) {
+    document.getElementById('out').setAttribute('data-result', 'sending');
+    return ctx.sendRequest(overrides)
+      .then(function (res) {
+        var d = res && res.data;
+        if (typeof d === 'string') { try { d = JSON.parse(d); } catch (e) {} }
+        var q = (d && d.q) ? d.q : '(none)';
+        document.getElementById('out').setAttribute('data-result', String(q));
+      })
+      .catch(function (e) {
+        document.getElementById('out').setAttribute('data-result', 'ERR:' + (e && e.message));
+      });
+  };
+  window.__setVar = function (k, v) { ctx.setRuntimeVariable(k, v); };
+  window.__log = function () { ctx.log('hello from app', 42); return 'logged'; };
+</script>`;
+
+// POST to the echo endpoint with a templated JSON body so an overridden `q`
+// runtime variable round-trips back in the response. (Uses /api/echo/json,
+// the same endpoint the rest of the suite relies on.)
+const ECHO_JSON_URL = 'http://localhost:8081/api/echo/json';
+
+// Set the JSON request body via the CodeMirror API — typing `{{q}}` would trip
+// auto-close-bracket handling.
+const setJsonBodyWithVar = async (page) => {
+  await selectRequestBodyMode(page, 'JSON');
+  const editor = page.getByTestId('request-body-editor').locator('.CodeMirror').first();
+  await editor.waitFor({ state: 'visible' });
+  await editor.evaluate((el) => {
+    const cm = (el as any).CodeMirror;
+    if (cm) cm.setValue('{"q":"{{q}}"}');
+  });
+};
+
+test.describe('Apps - ctx API', () => {
+  test('exposes the full ctx surface inside the guest', async ({ page, electronApp, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-surface');
+    await createCollection(page, 'apps-ctx', collectionPath);
+    await createRequest(page, 'ctx-req', 'apps-ctx', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-ctx', 'ctx-req', { persist: true });
+
+    await setAppCode(page, CTX_APP);
+    await enableApp(page);
+    await waitForGuestReady(electronApp);
+
+    const raw = await guestEval(
+      electronApp,
+      `JSON.stringify({
+        ctx: typeof window.ctx,
+        sendRequest: typeof window.ctx.sendRequest,
+        setRuntimeVariable: typeof window.ctx.setRuntimeVariable,
+        log: typeof window.ctx.log,
+        variablesIsObject: !!(window.ctx.variables && typeof window.ctx.variables === 'object'),
+        hooks: ['onThemeChange','onResponseUpdate','onResultsUpdate','onVariablesUpdate'].filter(function (k) { return k in window.ctx; })
+      })`
+    );
+    const surface = JSON.parse(raw as string);
+
+    expect(surface.ctx).toBe('object');
+    expect(surface.sendRequest).toBe('function');
+    expect(surface.setRuntimeVariable).toBe('function');
+    expect(surface.log).toBe('function');
+    expect(surface.variablesIsObject).toBe(true);
+    expect(surface.hooks).toEqual(['onThemeChange', 'onResponseUpdate', 'onResultsUpdate', 'onVariablesUpdate']);
+  });
+
+  test('ctx.theme is applied to the guest document', async ({ page, electronApp, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-theme');
+    await createCollection(page, 'apps-theme', collectionPath);
+    await createRequest(page, 'theme-req', 'apps-theme', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-theme', 'theme-req', { persist: true });
+
+    await setAppCode(page, CTX_APP);
+    await enableApp(page);
+    await waitForGuestReady(electronApp);
+
+    const raw = await guestEval(
+      electronApp,
+      'JSON.stringify({ theme: window.ctx.theme, bodyClass: document.body.className })'
+    );
+    const { theme, bodyClass } = JSON.parse(raw as string);
+    expect(['light', 'dark']).toContain(theme);
+    expect(bodyClass).toContain(theme);
+  });
+
+  test('ctx.log is callable without throwing', async ({ page, electronApp, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-log');
+    await createCollection(page, 'apps-log', collectionPath);
+    await createRequest(page, 'log-req', 'apps-log', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-log', 'log-req', { persist: true });
+
+    await setAppCode(page, CTX_APP);
+    await enableApp(page);
+    await waitForGuestReady(electronApp);
+
+    const result = await guestEval(electronApp, 'window.__log()');
+    expect(result).toBe('logged');
+  });
+
+  test('ctx.sendRequest sends the request and resolves with the response', async ({ page, electronApp, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-send');
+    await createCollection(page, 'apps-send', collectionPath);
+    await createRequest(page, 'send-req', 'apps-send', { method: 'POST', url: ECHO_JSON_URL });
+    await openRequest(page, 'apps-send', 'send-req', { persist: true });
+
+    await setJsonBodyWithVar(page);
+    await setAppCode(page, CTX_APP);
+    await saveRequest(page);
+    await enableApp(page);
+    await waitForGuestReady(electronApp);
+
+    await test.step('flat override keys become runtime variables', async () => {
+      await guestEval(electronApp, `void window.__send({ q: 'reflectme' })`);
+      await expect.poll(() => guestResult(electronApp), { timeout: 15000 }).toBe('reflectme');
+    });
+
+    await test.step('explicit { variables } override is also honoured', async () => {
+      await guestEval(electronApp, `void window.__send({ variables: { q: 'viaExplicit' } })`);
+      await expect.poll(() => guestResult(electronApp), { timeout: 15000 }).toBe('viaExplicit');
+    });
+  });
+
+  test('ctx.setRuntimeVariable persists for subsequent sends', async ({ page, electronApp, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-setvar');
+    await createCollection(page, 'apps-setvar', collectionPath);
+    await createRequest(page, 'setvar-req', 'apps-setvar', { method: 'POST', url: ECHO_JSON_URL });
+    await openRequest(page, 'apps-setvar', 'setvar-req', { persist: true });
+
+    await setJsonBodyWithVar(page);
+    await setAppCode(page, CTX_APP);
+    await saveRequest(page);
+    await enableApp(page);
+    await waitForGuestReady(electronApp);
+
+    await guestEval(electronApp, `window.__setVar('q', 'viaSet')`);
+    // Wait for the variable to round-trip back into the guest's ctx.variables
+    // (host dispatch → store update → AppView re-render → variables push) rather
+    // than guessing with a fixed timeout, then send with no override.
+    await expect
+      .poll(() => guestEval(electronApp, `window.ctx && window.ctx.variables && window.ctx.variables.q`), { timeout: 15000 })
+      .toBe('viaSet');
+    await guestEval(electronApp, 'void window.__send()');
+    await expect.poll(() => guestResult(electronApp), { timeout: 15000 }).toBe('viaSet');
+  });
+
+  test('the ctx bootstrap and user code are injected into the webview source', async ({ page, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ctx-bootstrap');
+    await createCollection(page, 'apps-boot', collectionPath);
+    await createRequest(page, 'boot-req', 'apps-boot', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-boot', 'boot-req', { persist: true });
+
+    await setAppCode(page, CTX_APP);
+    await enableApp(page);
+
+    const html = await getAppWebviewHtml(page);
+    // ctx API surface is present in the injected bootstrap
+    expect(html).toContain('window.ctx');
+    expect(html).toContain('sendRequest');
+    expect(html).toContain('setRuntimeVariable');
+    expect(html).toContain('__brunoReceive');
+    // user code is present
+    expect(html).toContain('window.__send');
+    expect(html).toContain('window.__log');
+  });
+});
diff --git a/tests/apps/apps-ui.spec.ts b/tests/apps/apps-ui.spec.ts
new file mode 100644
index 000000000..2d475bd44
--- /dev/null
+++ b/tests/apps/apps-ui.spec.ts
@@ -0,0 +1,121 @@
+import { test, expect } from '../../playwright';
+import {
+  createCollection,
+  createRequest,
+  openRequest,
+  selectRequestPaneTab,
+  setAppCode,
+  enableApp,
+  exitApp,
+  selectViewMode,
+  saveRequest,
+  closeAllTabs
+} from '../utils/page';
+
+const SIMPLE_APP = `<div id="hello">Hello from the app</div>`;
+
+// Read the app code currently loaded in the App-tab editor (via the CodeMirror API).
+const readAppEditor = (page) =>
+  page
+    .getByTestId('app-code-editor')
+    .locator('.CodeMirror')
+    .first()
+    .evaluate((el) => (el as any).CodeMirror?.getValue());
+
+test.describe('Apps - request-level UI', () => {
+  test('App tab: enable takes over the panes, exit returns to the editor', async ({ page, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ui-toggle');
+    await createCollection(page, 'apps-ui', collectionPath);
+    await createRequest(page, 'app-req', 'apps-ui', {
+      url: 'http://localhost:8081/api/echo/anything/x',
+      method: 'GET'
+    });
+    await openRequest(page, 'apps-ui', 'app-req', { persist: true });
+
+    await test.step('App tab exposes the toggle and editor', async () => {
+      await selectRequestPaneTab(page, 'App');
+      await expect(page.getByTestId('app-enable-toggle')).toBeVisible();
+      await expect(page.getByTestId('app-code-editor')).toBeVisible();
+      // request pane is still the normal request view while disabled
+      await expect(page.getByTestId('request-pane')).toBeVisible();
+    });
+
+    await setAppCode(page, SIMPLE_APP);
+
+    await test.step('Enabling app mode replaces the request/response area with the app view', async () => {
+      await enableApp(page);
+      await expect(page.getByTestId('app-view').locator('webview')).toBeVisible();
+      await expect(page.getByTestId('request-pane')).toBeHidden();
+    });
+
+    await test.step('Exit returns to the request pane / App editor', async () => {
+      await exitApp(page);
+      await selectRequestPaneTab(page, 'App');
+      await expect(page.getByTestId('app-code-editor')).toBeVisible();
+    });
+  });
+
+  test('App tab shows a status-dot indicator once code is present', async ({ page, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ui-indicator');
+    await createCollection(page, 'apps-ind', collectionPath);
+    await createRequest(page, 'ind-req', 'apps-ind', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-ind', 'ind-req', { persist: true });
+
+    await selectRequestPaneTab(page, 'App');
+    // No code yet → no indicator
+    await expect(page.getByTestId('responsive-tab-app').getByTestId('status-dot-app')).toHaveCount(0);
+
+    await setAppCode(page, SIMPLE_APP);
+    await expect(page.getByTestId('responsive-tab-app').getByTestId('status-dot-app')).toBeVisible();
+  });
+
+  test('Collection toolbar view-mode toggle switches Request / App / File', async ({ page, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ui-viewmode');
+    await createCollection(page, 'apps-mode', collectionPath);
+    await createRequest(page, 'mode-req', 'apps-mode', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-mode', 'mode-req', { persist: true });
+    await setAppCode(page, SIMPLE_APP);
+
+    await test.step('Request mode is active by default', async () => {
+      await expect(page.getByTestId('view-mode-request')).toHaveClass(/active/);
+      await expect(page.getByTestId('request-pane')).toBeVisible();
+    });
+
+    await test.step('Switch to App mode', async () => {
+      await selectViewMode(page, 'app');
+      await expect(page.getByTestId('view-mode-app')).toHaveClass(/active/);
+      await expect(page.getByTestId('app-view').locator('webview')).toBeVisible();
+    });
+
+    await test.step('Switch to File mode (app view goes away)', async () => {
+      await selectViewMode(page, 'file');
+      await expect(page.getByTestId('view-mode-file')).toHaveClass(/active/);
+      await expect(page.getByTestId('app-view')).toBeHidden();
+    });
+
+    await test.step('Switch back to Request mode', async () => {
+      await selectViewMode(page, 'request');
+      await expect(page.getByTestId('view-mode-request')).toHaveClass(/active/);
+      await expect(page.getByTestId('request-pane')).toBeVisible();
+    });
+  });
+
+  test('App code persists across save + reopen', async ({ page, createTmpDir }) => {
+    const collectionPath = await createTmpDir('apps-ui-persist');
+    await createCollection(page, 'apps-persist', collectionPath);
+    await createRequest(page, 'persist-req', 'apps-persist', { url: 'http://localhost:8081/api/echo/anything/x' });
+    await openRequest(page, 'apps-persist', 'persist-req', { persist: true });
+
+    await setAppCode(page, SIMPLE_APP);
+    await saveRequest(page);
+
+    await closeAllTabs(page);
+
+    await openRequest(page, 'apps-persist', 'persist-req', { persist: true });
+    await selectRequestPaneTab(page, 'App');
+    await expect(page.getByTestId('app-code-editor')).toBeVisible();
+    await expect.poll(() => readAppEditor(page)).toBe(SIMPLE_APP);
+    // App mode starts disabled on reopen (enabled is runtime-only, not persisted)
+    await expect(page.getByTestId('app-enable-toggle')).toBeVisible();
+  });
+});
diff --git a/tests/utils/page/actions.ts b/tests/utils/page/actions.ts
index d19f00172..e9f4ab858 100644
--- a/tests/utils/page/actions.ts
+++ b/tests/utils/page/actions.ts
@@ -1944,6 +1944,75 @@ const generateCollectionDocs = async (
   });
 };
 
+/**
+ * Set the request's app code. Opens the App tab and writes the editor value
+ * directly via the CodeMirror API (avoids auto-close-bracket corruption when
+ * typing HTML/JS char-by-char). The app must not be enabled (editor visible).
+ * @param page - The page object
+ * @param code - The HTML/JS app code
+ */
+const setAppCode = async (page: Page, code: string) => {
+  await test.step('Set app code', async () => {
+    await selectRequestPaneTab(page, 'App');
+    const editor = page.getByTestId('app-code-editor').locator('.CodeMirror').first();
+    await editor.waitFor({ state: 'visible' });
+    await editor.evaluate((el, val) => {
+      const cm = (el as any).CodeMirror;
+      if (cm) cm.setValue(val);
+    }, code);
+  });
+};
+
+/**
+ * Enable app mode via the App tab's "Enable App" toggle. Asserts the app view
+ * takes over the request/response area.
+ * @param page - The page object
+ */
+const enableApp = async (page: Page) => {
+  await test.step('Enable app mode (App tab toggle)', async () => {
+    await selectRequestPaneTab(page, 'App');
+    await page.getByTestId('app-enable-toggle').click();
+    await expect(page.getByTestId('app-view')).toBeVisible({ timeout: 5000 });
+  });
+};
+
+/**
+ * Exit app mode via the app view's "Exit to editor" button.
+ * @param page - The page object
+ */
+const exitApp = async (page: Page) => {
+  await test.step('Exit app mode', async () => {
+    await page.getByTestId('app-exit-button').click();
+    await expect(page.getByTestId('app-view')).toBeHidden({ timeout: 5000 });
+  });
+};
+
+/**
+ * Switch the active request's view mode using the collection toolbar toggle.
+ * @param page - The page object
+ * @param mode - 'request' | 'app' | 'file'
+ */
+const selectViewMode = async (page: Page, mode: 'request' | 'app' | 'file') => {
+  await test.step(`Switch view mode to "${mode}"`, async () => {
+    await page.getByTestId(`view-mode-${mode}`).click();
+  });
+};
+
+/**
+ * Read the decoded HTML the app webview is loading (its data: URL src).
+ * Useful for asserting the injected ctx bootstrap and user code.
+ * @param page - The page object
+ * @returns The decoded HTML document string
+ */
+const getAppWebviewHtml = async (page: Page): Promise<string> => {
+  const webview = page.getByTestId('app-view').locator('webview');
+  await webview.waitFor({ state: 'attached', timeout: 5000 });
+  const src = await webview.getAttribute('src');
+  if (!src) return '';
+  const comma = src.indexOf(',');
+  return decodeURIComponent(src.slice(comma + 1));
+};
+
 /**
  * Rename a websocket message by double-clicking its label and typing a new name.
  * @param page - The page object
@@ -2080,6 +2149,11 @@ export {
   openRequestInFolder,
   setUrlEncoding,
   generateCollectionDocs,
+  setAppCode,
+  enableApp,
+  exitApp,
+  selectViewMode,
+  getAppWebviewHtml,
   renameWsMessage
 };