diff --git a/frontend/index.html b/frontend/index.html
index 1ff3e70..02ccb1e 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -62,6 +62,10 @@ textarea { resize: vertical; min-height: 120px; }
 .offline-work-controls label { display:flex; gap:8px; align-items:center; min-height:44px; }
 .offline-work-controls input { width:20px; height:20px; }
 .offline-work-controls button { min-height:44px; }
+.install-app-card { display:flex; gap:10px; align-items:center; flex-wrap:wrap; width:100%; padding:10px; border:1px solid #31577f; border-radius:12px; background:#10233a; }
+.install-app-card[hidden] { display:none; }
+.install-app-card p { margin:0; flex:1 1 240px; }
+.install-app-card button { min-height:44px; }
 .widget { border: 1px solid #1b2d45; border-radius: 12px; padding: 10px; background: linear-gradient(180deg,#0f1d33,#0b1526); }
 .widget h3 { margin: 4px 0 8px; font-size: 13px; color: #7aa1c9; }
 .event { padding: 8px 0; border-bottom: 1px solid #1b2d45; }
@@ -343,6 +347,13 @@ textarea { resize: vertical; min-height: 120px; }
         <button id="clear-offline-work" type="button">Clear offline work data</button>
         <span class="small" id="offline-work-status" role="status" aria-live="polite"></span>
         <span class="small" id="delivery-receipt-status" role="status" aria-live="polite"></span>
+        <div class="install-app-card" id="install-app-card" hidden>
+          <p><strong>Install Stackchain</strong><br><span class="small">Keep mobile work one tap away and launch the saved app shell during an outage.</span></p>
+          <p class="small" id="install-app-guidance" hidden>On Safari, tap Share, then choose <strong>Add to Home Screen</strong>.</p>
+          <button id="install-app" type="button">Install Stackchain</button>
+          <button id="dismiss-install-app" type="button">Not now</button>
+        </div>
+        <span class="small" id="install-app-status" role="status" aria-live="polite"></span>
       </div>
     </div>
     <div class="my-work-list" id="my-work-list"></div>
@@ -792,6 +803,7 @@ textarea { resize: vertical; min-height: 120px; }
 <script src="static/work-route.js"></script>
 <script src="static/context-poller.js"></script>
 <script src="static/mobile-task-dock.js"></script>
+<script src="static/install-app.js"></script>
 <script>
 (function(){
   const qs = (s, el=document) => el.querySelector(s);
@@ -3731,6 +3743,22 @@ textarea { resize: vertical; min-height: 120px; }
       console.warn('Stackchain install support unavailable', error)
     );
   }
+  const isIosDevice = /iPad|iPhone|iPod/.test(navigator.userAgent) ||
+    (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
+  const isIosSafari = isIosDevice && /Safari/.test(navigator.userAgent) &&
+    !/CriOS|FxiOS|EdgiOS|OPiOS/.test(navigator.userAgent);
+  createInstallApp({
+    window,
+    card: qs('#install-app-card'),
+    installButton: qs('#install-app'),
+    dismissButton: qs('#dismiss-install-app'),
+    guidance: qs('#install-app-guidance'),
+    status: qs('#install-app-status'),
+    storage: localStorage,
+    isStandalone: () => window.matchMedia('(display-mode: standalone)').matches ||
+      navigator.standalone === true,
+    isIosSafari: () => isIosSafari,
+  }).start();
   contextPoller.start();
   document.addEventListener('visibilitychange', () => {
     contextPoller.setVisible(!document.hidden);
diff --git a/frontend/install-app.js b/frontend/install-app.js
new file mode 100644
index 0000000..c4bfb8d
--- /dev/null
+++ b/frontend/install-app.js
@@ -0,0 +1,62 @@
+(function (root, factory) {
+  if (typeof module === 'object' && module.exports) module.exports = factory;
+  else root.createInstallApp = factory;
+})(typeof self !== 'undefined' ? self : this, function createInstallApp(options) {
+  const dismissedKey = 'stackchain.install.dismissed.v1';
+  let deferredPrompt = null;
+
+  function hide() {
+    options.card.hidden = true;
+  }
+
+  function showNativePrompt(event) {
+    event.preventDefault();
+    deferredPrompt = event;
+    options.guidance.hidden = true;
+    options.installButton.hidden = false;
+    options.card.hidden = false;
+  }
+
+  async function install() {
+    if (!deferredPrompt) return;
+    const prompt = deferredPrompt;
+    deferredPrompt = null;
+    options.installButton.disabled = true;
+    await prompt.prompt();
+    const choice = await prompt.userChoice;
+    if (choice.outcome === 'accepted') {
+      hide();
+      options.status.textContent = 'Stackchain was added to your device.';
+    } else {
+      hide();
+      options.installButton.disabled = false;
+      options.status.textContent = 'Installation was not completed.';
+    }
+  }
+
+  function dismiss() {
+    options.storage.setItem(dismissedKey, '1');
+    hide();
+  }
+
+  function start() {
+    if (options.isStandalone() || options.storage.getItem(dismissedKey) === '1') {
+      hide();
+      return;
+    }
+    if (options.isIosSafari()) {
+      options.installButton.hidden = true;
+      options.guidance.hidden = false;
+      options.card.hidden = false;
+    }
+    options.window.addEventListener('beforeinstallprompt', showNativePrompt);
+    options.window.addEventListener('appinstalled', () => {
+      deferredPrompt = null;
+      hide();
+    });
+    options.installButton.addEventListener('click', install);
+    options.dismissButton.addEventListener('click', dismiss);
+  }
+
+  return {start};
+});
diff --git a/frontend/service-worker.js b/frontend/service-worker.js
index 9a7e74b..7cea91b 100644
--- a/frontend/service-worker.js
+++ b/frontend/service-worker.js
@@ -1,6 +1,6 @@
 const BASE = new URL('./', self.location.href).pathname;
 importScripts(BASE + 'static/background-issue-sync.js');
-const CACHE = 'stackchain-dashboard-shell-v23';
+const CACHE = 'stackchain-dashboard-shell-v24';
 const OUTAGE_STATUSES = new Set([500, 502, 503, 504]);
 const SHELL = [
   BASE,
@@ -30,6 +30,7 @@ const SHELL = [
   BASE + 'static/work-route.js',
   BASE + 'static/context-poller.js',
   BASE + 'static/mobile-task-dock.js',
+  BASE + 'static/install-app.js',
   BASE + 'static/background-issue-sync.js',
 ];
 
diff --git a/tests/test_install_app.py b/tests/test_install_app.py
new file mode 100644
index 0000000..9597e66
--- /dev/null
+++ b/tests/test_install_app.py
@@ -0,0 +1,212 @@
+import json
+import subprocess
+from pathlib import Path
+
+import pytest
+
+from src.views import dashboard
+
+
+INSTALL_APP = Path(__file__).resolve().parents[1] / "frontend" / "install-app.js"
+
+
+def run_install_scenario(scenario: str) -> dict:
+    script = f"""
+const createInstallApp = require({json.dumps(str(INSTALL_APP))});
+class FakeTarget {{
+  constructor() {{ this.listeners = {{}}; }}
+  addEventListener(name, callback) {{ (this.listeners[name] ||= []).push(callback); }}
+  dispatch(name, event = {{}}) {{ for (const callback of this.listeners[name] || []) callback(event); }}
+}}
+class FakeButton extends FakeTarget {{
+  constructor() {{ super(); this.disabled = false; }}
+  click() {{ this.dispatch('click', {{currentTarget:this}}); }}
+}}
+(async () => {{
+{scenario}
+}})().catch(error => {{ console.error(error); process.exit(1); }});
+"""
+    completed = subprocess.run(
+        ["node", "-e", script], capture_output=True, text=True
+    )
+    assert completed.returncode == 0, completed.stderr
+    return json.loads(completed.stdout)
+
+
+def test_native_install_prompt_is_revealed_by_eligibility_and_invoked_once():
+    result = run_install_scenario(
+        """
+const windowTarget = new FakeTarget();
+const card = {hidden:true};
+const install = new FakeButton();
+const dismiss = new FakeButton();
+const guidance = {hidden:true};
+const status = {textContent:''};
+let promptCalls = 0;
+const app = createInstallApp({
+  window:windowTarget, card, installButton:install, dismissButton:dismiss,
+  guidance, status, storage:{getItem:()=>null, setItem:()=>{}},
+  isStandalone:()=>false, isIosSafari:()=>false,
+});
+app.start();
+windowTarget.dispatch('beforeinstallprompt', {
+  preventDefault(){},
+  prompt:async () => { promptCalls += 1; },
+  userChoice:Promise.resolve({outcome:'accepted'}),
+});
+const shown = !card.hidden;
+install.click();
+await new Promise(resolve => setImmediate(resolve));
+install.click();
+await new Promise(resolve => setImmediate(resolve));
+process.stdout.write(JSON.stringify({shown, promptCalls, hidden:card.hidden, status:status.textContent}));
+"""
+    )
+
+    assert result == {
+        "shown": True,
+        "promptCalls": 1,
+        "hidden": True,
+        "status": "Stackchain was added to your device.",
+    }
+
+
+def test_declined_native_install_hides_the_spent_choice_and_announces_it():
+    result = run_install_scenario(
+        """
+const windowTarget = new FakeTarget();
+const card = {hidden:true};
+const install = new FakeButton();
+const status = {textContent:''};
+const app = createInstallApp({
+  window:windowTarget, card, installButton:install, dismissButton:new FakeButton(),
+  guidance:{hidden:true}, status, storage:{getItem:()=>null, setItem:()=>{}},
+  isStandalone:()=>false, isIosSafari:()=>false,
+});
+app.start();
+windowTarget.dispatch('beforeinstallprompt', {
+  preventDefault(){}, prompt:async()=>{}, userChoice:Promise.resolve({outcome:'dismissed'}),
+});
+install.click();
+await new Promise(resolve => setImmediate(resolve));
+process.stdout.write(JSON.stringify({hidden:card.hidden, disabled:install.disabled, status:status.textContent}));
+"""
+    )
+
+    assert result == {
+        "hidden": True,
+        "disabled": False,
+        "status": "Installation was not completed.",
+    }
+
+
+def test_ios_safari_gets_manual_add_to_home_screen_guidance():
+    result = run_install_scenario(
+        """
+const windowTarget = new FakeTarget();
+const card = {hidden:true};
+const install = new FakeButton(); install.hidden = false;
+const dismiss = new FakeButton();
+const guidance = {hidden:true};
+const status = {textContent:''};
+const app = createInstallApp({
+  window:windowTarget, card, installButton:install, dismissButton:dismiss,
+  guidance, status, storage:{getItem:()=>null, setItem:()=>{}},
+  isStandalone:()=>false, isIosSafari:()=>true,
+});
+app.start();
+process.stdout.write(JSON.stringify({cardHidden:card.hidden, installHidden:install.hidden, guidanceHidden:guidance.hidden}));
+"""
+    )
+
+    assert result == {
+        "cardHidden": False,
+        "installHidden": True,
+        "guidanceHidden": False,
+    }
+
+
+def test_standalone_launch_never_promotes_installation():
+    result = run_install_scenario(
+        """
+const windowTarget = new FakeTarget();
+const card = {hidden:true};
+const app = createInstallApp({
+  window:windowTarget, card, installButton:new FakeButton(), dismissButton:new FakeButton(),
+  guidance:{hidden:true}, status:{textContent:''}, storage:{getItem:()=>null, setItem:()=>{}},
+  isStandalone:()=>true, isIosSafari:()=>true,
+});
+app.start();
+windowTarget.dispatch('beforeinstallprompt', {preventDefault(){}, prompt:async()=>{}, userChoice:Promise.resolve({outcome:'accepted'})});
+process.stdout.write(JSON.stringify({hidden:card.hidden}));
+"""
+    )
+
+    assert result == {"hidden": True}
+
+
+def test_dismissal_is_remembered_and_suppresses_later_promotion():
+    result = run_install_scenario(
+        """
+const values = new Map();
+const storage = {getItem:key => values.get(key) || null, setItem:(key, value) => values.set(key, value)};
+const firstWindow = new FakeTarget();
+const firstCard = {hidden:true};
+const firstDismiss = new FakeButton();
+const first = createInstallApp({
+  window:firstWindow, card:firstCard, installButton:new FakeButton(), dismissButton:firstDismiss,
+  guidance:{hidden:true}, status:{textContent:''}, storage,
+  isStandalone:()=>false, isIosSafari:()=>true,
+});
+first.start();
+firstDismiss.click();
+const secondCard = {hidden:true};
+const second = createInstallApp({
+  window:new FakeTarget(), card:secondCard, installButton:new FakeButton(), dismissButton:new FakeButton(),
+  guidance:{hidden:true}, status:{textContent:''}, storage,
+  isStandalone:()=>false, isIosSafari:()=>true,
+});
+second.start();
+process.stdout.write(JSON.stringify({firstHidden:firstCard.hidden, remembered:values.size, secondHidden:secondCard.hidden}));
+"""
+    )
+
+    assert result == {"firstHidden": True, "remembered": 1, "secondHidden": True}
+
+
+def test_appinstalled_hides_an_visible_native_promotion():
+    result = run_install_scenario(
+        """
+const windowTarget = new FakeTarget();
+const card = {hidden:true};
+const app = createInstallApp({
+  window:windowTarget, card, installButton:new FakeButton(), dismissButton:new FakeButton(),
+  guidance:{hidden:true}, status:{textContent:''}, storage:{getItem:()=>null, setItem:()=>{}},
+  isStandalone:()=>false, isIosSafari:()=>false,
+});
+app.start();
+windowTarget.dispatch('beforeinstallprompt', {preventDefault(){}, prompt:async()=>{}, userChoice:Promise.resolve({outcome:'accepted'})});
+const shown = !card.hidden;
+windowTarget.dispatch('appinstalled');
+process.stdout.write(JSON.stringify({shown, hidden:card.hidden}));
+"""
+    )
+
+    assert result == {"shown": True, "hidden": True}
+
+
+@pytest.mark.anyio
+async def test_dashboard_renders_and_wires_touch_safe_install_promotion():
+    html = await dashboard()
+
+    assert 'id="install-app-card"' in html
+    assert 'id="install-app"' in html
+    assert 'id="dismiss-install-app"' in html
+    assert 'id="install-app-guidance"' in html
+    assert 'Share, then choose <strong>Add to Home Screen</strong>' in html
+    assert '.install-app-card button { min-height:44px;' in html
+    assert '<script src="static/install-app.js"></script>' in html
+    assert 'createInstallApp({' in html
+    assert "window.matchMedia('(display-mode: standalone)').matches" in html
+    assert "navigator.standalone === true" in html
+    assert "isIosSafari" in html
diff --git a/tests/test_service_worker.py b/tests/test_service_worker.py
index 5eb2298..940abad 100644
--- a/tests/test_service_worker.py
+++ b/tests/test_service_worker.py
@@ -91,11 +91,11 @@ async function dispatchNotificationClick(route) {{
     return json.loads(completed.stdout)
 
 
-def test_live_section_revisions_ship_in_a_new_shell_cache():
+def test_mobile_install_flow_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v23" in source
-    assert "BASE + 'static/today-work.js'" in source
+    assert "stackchain-dashboard-shell-v24" in source
+    assert "BASE + 'static/install-app.js'" in source
 
 
 def test_background_sync_event_flushes_closed_app_issue_outbox_only_for_its_tag():
@@ -207,6 +207,7 @@ def test_install_precaches_complete_subpath_scoped_app_shell():
         "/dashboard/static/work-route.js",
         "/dashboard/static/context-poller.js",
         "/dashboard/static/mobile-task-dock.js",
+        "/dashboard/static/install-app.js",
         "/dashboard/static/background-issue-sync.js",
     }