diff --git a/web/.env.example b/web/.env.example
index 2604758..23023d1 100644
--- a/web/.env.example
+++ b/web/.env.example
@@ -1,5 +1,6 @@
 NEXT_PUBLIC_SITE_URL=http://localhost:3000
 NEXT_PUBLIC_API_BASE_URL=http://localhost:3001/api/v1
+NEXT_PUBLIC_LATEST_APP_VERSION_CODE=17
 NEXT_PUBLIC_GOOGLE_CLIENT_ID=
 NEXT_PUBLIC_TAWKTO_EMBED_URL=
 
diff --git a/web/app/(app)/dashboard/(components)/device-list.tsx b/web/app/(app)/dashboard/(components)/device-list.tsx
index 24f1c76..6ed6b88 100644
--- a/web/app/(app)/dashboard/(components)/device-list.tsx
+++ b/web/app/(app)/dashboard/(components)/device-list.tsx
@@ -3,14 +3,20 @@
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
-import { ScrollArea } from '@/components/ui/scroll-area'
 import { Smartphone, Battery, Signal, Copy } from 'lucide-react'
 import { useToast } from '@/hooks/use-toast'
 import httpBrowserClient from '@/lib/httpBrowserClient'
 import { ApiEndpoints } from '@/config/api'
+import { Routes } from '@/config/routes'
 import { useQuery } from '@tanstack/react-query'
 import { Skeleton } from '@/components/ui/skeleton'
 import { formatDeviceName } from '@/lib/utils'
+import {
+  DeviceVersionCandidate,
+  getDeviceVersionCode,
+  isDeviceOutdated,
+  latestAppVersionCode,
+} from './update-app-helpers'
 
 export default function DeviceList() {
   const { toast } = useToast()
@@ -86,14 +92,24 @@ export default function DeviceList() {
                       <h3 className='font-semibold text-sm'>
                         {formatDeviceName(device)}
                       </h3>
-                      <Badge
-                        variant={
-                          device.status === 'online' ? 'default' : 'secondary'
-                        }
-                        className='text-xs'
-                      >
-                        {device.enabled ? 'Enabled' : 'Disabled'}
-                      </Badge>
+                      <div className='flex items-center gap-2'>
+                        {isDeviceOutdated(device as DeviceVersionCandidate) && (
+                          <Badge
+                            variant='outline'
+                            className='border-amber-300 bg-amber-50 text-amber-700 dark:border-amber-800 dark:bg-amber-950/40 dark:text-amber-300'
+                          >
+                            Update available
+                          </Badge>
+                        )}
+                        <Badge
+                          variant={
+                            device.status === 'online' ? 'default' : 'secondary'
+                          }
+                          className='text-xs'
+                        >
+                          {device.enabled ? 'Enabled' : 'Disabled'}
+                        </Badge>
+                      </div>
                     </div>
                     <div className='flex items-center space-x-2 mt-1'>
                       <code className='relative rounded bg-muted px-[0.3rem] py-[0.2rem] font-mono text-xs'>
@@ -116,6 +132,11 @@ export default function DeviceList() {
                       <div className='flex items-center'>
                         <Signal className='h-3 w-3 mr-1' />-
                       </div>
+                      <div>
+                        App version:{' '}
+                        {getDeviceVersionCode(device as DeviceVersionCandidate) ??
+                          'unknown'}
+                      </div>
                       <div>
                         Registered at:{' '}
                         {new Date(device.createdAt).toLocaleString('en-US', {
@@ -124,6 +145,31 @@ export default function DeviceList() {
                         })}
                       </div>
                     </div>
+                    {isDeviceOutdated(device as DeviceVersionCandidate) && (
+                      <div className='mt-3 flex items-center justify-between gap-2 rounded-lg border border-brand-100 bg-brand-50/60 px-3 py-2 dark:border-brand-900/50 dark:bg-brand-950/20'>
+                        <p className='text-xs text-muted-foreground'>
+                          This device is behind the latest supported version{' '}
+                          <span className='font-medium text-foreground'>
+                            {latestAppVersionCode}
+                          </span>
+                          .
+                        </p>
+                        <Button
+                          variant='outline'
+                          size='sm'
+                          asChild
+                          className='shrink-0'
+                        >
+                          <a
+                            href={Routes.downloadAndroidApp}
+                            target='_blank'
+                            rel='noreferrer'
+                          >
+                            Update app
+                          </a>
+                        </Button>
+                      </div>
+                    )}
                   </div>
                 </CardContent>
               </Card>
diff --git a/web/app/(app)/dashboard/(components)/update-app-helpers.ts b/web/app/(app)/dashboard/(components)/update-app-helpers.ts
new file mode 100644
index 0000000..16bcddd
--- /dev/null
+++ b/web/app/(app)/dashboard/(components)/update-app-helpers.ts
@@ -0,0 +1,169 @@
+'use client'
+
+import { useCallback, useEffect, useState } from 'react'
+
+export type DeviceVersionCandidate = {
+  _id: string
+  brand: string
+  model: string
+  name?: string | null
+  appVersionCode?: number | null
+  appVersionInfo?: {
+    versionCode?: number | null
+  } | null
+}
+
+export const DEFAULT_LATEST_APP_VERSION_CODE = 17
+export const UPDATE_APP_REMIND_LATER_MS = 6 * 60 * 60 * 1000
+export const UPDATE_APP_DONT_ASK_AGAIN_MS = 30 * 24 * 60 * 60 * 1000
+
+const UPDATE_APP_SNOOZE_KEY = 'update_app_prompt_snooze_until'
+const UPDATE_APP_SNOOZE_EVENT = 'update-app-prompt-snooze-changed'
+
+const envLatestVersionCode = Number.parseInt(
+  process.env.NEXT_PUBLIC_LATEST_APP_VERSION_CODE?.trim() ?? '',
+  10
+)
+
+export const latestAppVersionCode =
+  Number.isFinite(envLatestVersionCode) && envLatestVersionCode > 0
+    ? envLatestVersionCode
+    : DEFAULT_LATEST_APP_VERSION_CODE
+
+export function getDeviceVersionCode(device: DeviceVersionCandidate) {
+  const heartbeatVersionCode = device.appVersionInfo?.versionCode
+
+  if (typeof heartbeatVersionCode === 'number') {
+    return heartbeatVersionCode
+  }
+
+  return typeof device.appVersionCode === 'number' ? device.appVersionCode : null
+}
+
+export function isDeviceOutdated(
+  device: DeviceVersionCandidate,
+  latestVersionCode = latestAppVersionCode
+) {
+  const deviceVersionCode = getDeviceVersionCode(device)
+
+  if (deviceVersionCode === null) {
+    return false
+  }
+
+  return deviceVersionCode < latestVersionCode
+}
+
+export function getOutdatedDevices(
+  devices: DeviceVersionCandidate[] | undefined,
+  latestVersionCode = latestAppVersionCode
+) {
+  if (!devices?.length) {
+    return []
+  }
+
+  return devices.filter((device) => isDeviceOutdated(device, latestVersionCode))
+}
+
+export function summarizeOutdatedDeviceNames(
+  devices: DeviceVersionCandidate[],
+  formatDeviceName: (device: DeviceVersionCandidate) => string,
+  visibleCount = 3
+) {
+  const visibleDevices = devices.slice(0, visibleCount).map(formatDeviceName)
+  const remainingCount = Math.max(devices.length - visibleDevices.length, 0)
+
+  if (visibleDevices.length === 0) {
+    return ''
+  }
+
+  if (visibleDevices.length === 1) {
+    return visibleDevices[0]
+  }
+
+  if (visibleDevices.length === 2) {
+    return remainingCount > 0
+      ? `${visibleDevices[0]}, ${visibleDevices[1]} and ${remainingCount} more device${
+          remainingCount > 1 ? 's' : ''
+        }`
+      : `${visibleDevices[0]} and ${visibleDevices[1]}`
+  }
+
+  const namedPrefix = `${visibleDevices[0]}, ${visibleDevices[1]} and ${visibleDevices[2]}`
+
+  return remainingCount > 0
+    ? `${namedPrefix} and ${remainingCount} more device${
+        remainingCount > 1 ? 's' : ''
+      }`
+    : namedPrefix
+}
+
+function readUpdatePromptSnoozeUntil() {
+  if (typeof window === 'undefined') {
+    return 0
+  }
+
+  const value = window.localStorage.getItem(UPDATE_APP_SNOOZE_KEY)
+  const parsedValue = value ? Number.parseInt(value, 10) : 0
+
+  return Number.isFinite(parsedValue) ? parsedValue : 0
+}
+
+function emitUpdatePromptSnoozeChanged() {
+  if (typeof window === 'undefined') {
+    return
+  }
+
+  window.dispatchEvent(new Event(UPDATE_APP_SNOOZE_EVENT))
+}
+
+export function setUpdatePromptSnooze(durationMs: number) {
+  if (typeof window === 'undefined') {
+    return
+  }
+
+  window.localStorage.setItem(
+    UPDATE_APP_SNOOZE_KEY,
+    (Date.now() + durationMs).toString()
+  )
+  emitUpdatePromptSnoozeChanged()
+}
+
+export function useUpdatePromptSnooze() {
+  const [snoozeUntil, setSnoozeUntil] = useState(0)
+
+  const refreshSnoozeUntil = useCallback(() => {
+    setSnoozeUntil(readUpdatePromptSnoozeUntil())
+  }, [])
+
+  useEffect(() => {
+    refreshSnoozeUntil()
+
+    const handleVisibilityChange = () => {
+      if (document.visibilityState === 'visible') {
+        refreshSnoozeUntil()
+      }
+    }
+
+    window.addEventListener('storage', refreshSnoozeUntil)
+    window.addEventListener(
+      UPDATE_APP_SNOOZE_EVENT,
+      refreshSnoozeUntil as EventListener
+    )
+    document.addEventListener('visibilitychange', handleVisibilityChange)
+
+    return () => {
+      window.removeEventListener('storage', refreshSnoozeUntil)
+      window.removeEventListener(
+        UPDATE_APP_SNOOZE_EVENT,
+        refreshSnoozeUntil as EventListener
+      )
+      document.removeEventListener('visibilitychange', handleVisibilityChange)
+    }
+  }, [refreshSnoozeUntil])
+
+  return {
+    isSnoozed: snoozeUntil > Date.now(),
+    snoozeUntil,
+    refreshSnoozeUntil,
+  }
+}
diff --git a/web/app/(app)/dashboard/(components)/update-app-modal.tsx b/web/app/(app)/dashboard/(components)/update-app-modal.tsx
new file mode 100644
index 0000000..96955b9
--- /dev/null
+++ b/web/app/(app)/dashboard/(components)/update-app-modal.tsx
@@ -0,0 +1,160 @@
+'use client'
+
+import { useEffect, useMemo, useRef, useState } from 'react'
+import Link from 'next/link'
+import { useQuery } from '@tanstack/react-query'
+import { Download, Sparkles, Smartphone } from 'lucide-react'
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { ApiEndpoints } from '@/config/api'
+import { Routes } from '@/config/routes'
+import httpBrowserClient from '@/lib/httpBrowserClient'
+import { formatDeviceName } from '@/lib/utils'
+import {
+  DeviceVersionCandidate,
+  UPDATE_APP_DONT_ASK_AGAIN_MS,
+  UPDATE_APP_REMIND_LATER_MS,
+  getOutdatedDevices,
+  latestAppVersionCode,
+  setUpdatePromptSnooze,
+  summarizeOutdatedDeviceNames,
+  useUpdatePromptSnooze,
+} from './update-app-helpers'
+
+export default function UpdateAppModal() {
+  const [isOpen, setIsOpen] = useState(false)
+  const ignoreNextOpenChangeRef = useRef(false)
+  const { isSnoozed } = useUpdatePromptSnooze()
+
+  const { data: devicesResponse, isLoading, error } = useQuery({
+    queryKey: ['devices'],
+    queryFn: () =>
+      httpBrowserClient
+        .get(ApiEndpoints.gateway.listDevices())
+        .then((res) => res.data),
+  })
+
+  const outdatedDevices = useMemo(
+    () =>
+      getOutdatedDevices(
+        (devicesResponse?.data ?? []) as DeviceVersionCandidate[]
+      ),
+    [devicesResponse?.data]
+  )
+
+  const primaryOutdatedDevice = outdatedDevices[0]
+
+  useEffect(() => {
+    if (isLoading || error || isSnoozed || outdatedDevices.length === 0) {
+      setIsOpen(false)
+      return
+    }
+
+    if (isOpen) {
+      return
+    }
+
+    const timer = window.setTimeout(() => {
+      setIsOpen(true)
+    }, 900)
+
+    return () => window.clearTimeout(timer)
+  }, [error, isLoading, isOpen, isSnoozed, outdatedDevices.length])
+
+  const closeWithSnooze = (durationMs: number) => {
+    setUpdatePromptSnooze(durationMs)
+    ignoreNextOpenChangeRef.current = true
+    setIsOpen(false)
+  }
+
+  const handleOpenChange = (open: boolean) => {
+    if (!open && isOpen) {
+      if (ignoreNextOpenChangeRef.current) {
+        ignoreNextOpenChangeRef.current = false
+      } else {
+        setUpdatePromptSnooze(UPDATE_APP_REMIND_LATER_MS)
+      }
+    }
+
+    setIsOpen(open)
+  }
+
+  if (!primaryOutdatedDevice || error) {
+    return null
+  }
+
+  const deviceSummary = summarizeOutdatedDeviceNames(
+    outdatedDevices,
+    formatDeviceName
+  )
+
+  return (
+    <Dialog open={isOpen} onOpenChange={handleOpenChange}>
+      <DialogContent className='sm:max-w-lg border-brand-200 dark:border-brand-800'>
+        <DialogHeader>
+          <div className='mx-auto mb-3 flex h-12 w-12 items-center justify-center rounded-full bg-brand-100 text-brand-600 dark:bg-brand-900/30 dark:text-brand-300'>
+            <Smartphone className='h-6 w-6' />
+          </div>
+          <DialogTitle className='text-center text-2xl'>
+            You are using an older version of the textbee mobile app
+          </DialogTitle>
+          <DialogDescription className='text-center text-sm sm:text-base'>
+            <span className='font-medium text-foreground'>{deviceSummary}</span>{' '}
+            is ready for an update. Install version {latestAppVersionCode} to get
+            improved reliability, bug fixes, and more.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className='space-y-3 rounded-xl border border-brand-100 bg-brand-50/60 p-4 dark:border-brand-900/50 dark:bg-brand-950/20'>
+          <div className='flex items-start gap-3'>
+            <Sparkles className='mt-0.5 h-4 w-4 text-brand-500' />
+            <div className='space-y-1 text-sm text-muted-foreground'>
+              <p className='font-medium text-foreground'>Update highlights</p>
+              <p>Improved reliability, bug fixes, and more.</p>
+            </div>
+          </div>
+          <div className='flex items-start gap-3'>
+            <Download className='mt-0.5 h-4 w-4 text-brand-500' />
+            <div className='space-y-1 text-sm text-muted-foreground'>
+              <p className='font-medium text-foreground'>Recommended action</p>
+              <p>Download the latest Android app build and update your device.</p>
+            </div>
+          </div>
+        </div>
+
+        <DialogFooter className='flex-col gap-2 sm:flex-col'>
+          <Button asChild className='w-full'>
+            <Link href={Routes.downloadAndroidApp}>Update now</Link>
+          </Button>
+          <div className='flex w-full items-center justify-between gap-2'>
+            <Button
+              type='button'
+              variant='ghost'
+              size='sm'
+              onClick={() => closeWithSnooze(UPDATE_APP_REMIND_LATER_MS)}
+              className='text-muted-foreground'
+            >
+              Remind later
+            </Button>
+            <Button
+              type='button'
+              variant='ghost'
+              size='sm'
+              onClick={() => closeWithSnooze(UPDATE_APP_DONT_ASK_AGAIN_MS)}
+              className='text-muted-foreground hover:text-destructive'
+            >
+              Don&apos;t ask again
+            </Button>
+          </div>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
diff --git a/web/app/(app)/dashboard/(components)/update-app-notification-bar.tsx b/web/app/(app)/dashboard/(components)/update-app-notification-bar.tsx
new file mode 100644
index 0000000..2c0ef14
--- /dev/null
+++ b/web/app/(app)/dashboard/(components)/update-app-notification-bar.tsx
@@ -0,0 +1,64 @@
+'use client'
+
+import { useMemo } from 'react'
+import Link from 'next/link'
+import { useQuery } from '@tanstack/react-query'
+import { ArrowUpRight, BellRing } from 'lucide-react'
+import { Alert, AlertDescription } from '@/components/ui/alert'
+import { Button } from '@/components/ui/button'
+import { ApiEndpoints } from '@/config/api'
+import { Routes } from '@/config/routes'
+import httpBrowserClient from '@/lib/httpBrowserClient'
+import { formatDeviceName } from '@/lib/utils'
+import {
+  DeviceVersionCandidate,
+  getOutdatedDevices,
+  latestAppVersionCode,
+  summarizeOutdatedDeviceNames,
+} from './update-app-helpers'
+
+export default function UpdateAppNotificationBar() {
+  const { data: devicesResponse, isLoading, error } = useQuery({
+    queryKey: ['devices'],
+    queryFn: () =>
+      httpBrowserClient
+        .get(ApiEndpoints.gateway.listDevices())
+        .then((res) => res.data),
+  })
+
+  const outdatedDevices = useMemo(
+    () =>
+      getOutdatedDevices(
+        (devicesResponse?.data ?? []) as DeviceVersionCandidate[]
+      ),
+    [devicesResponse?.data]
+  )
+
+  const primaryOutdatedDevice = outdatedDevices[0]
+
+  if (isLoading || error || !primaryOutdatedDevice) {
+    return null
+  }
+
+  const summary = summarizeOutdatedDeviceNames(outdatedDevices, formatDeviceName)
+  const verb = outdatedDevices.length > 1 ? 'are' : 'is'
+
+  return (
+    <Alert className='sticky top-4 z-20 border-brand-200 bg-brand-50/95 text-brand-950 shadow-sm backdrop-blur dark:border-brand-800 dark:bg-brand-950/90 dark:text-brand-50'>
+      <BellRing className='h-4 w-4 text-brand-600 dark:text-brand-300' />
+      <AlertDescription className='flex flex-col gap-3 md:flex-row md:items-center md:justify-between'>
+        <div className='pr-2 text-sm'>
+          <span className='font-medium'>{summary}</span> {verb} running an older app
+          version. Update to version {latestAppVersionCode} for improved
+          reliability, bug fixes, and more.
+        </div>
+        <Button asChild size='sm' className='w-full md:w-auto shrink-0'>
+          <Link href={Routes.downloadAndroidApp}>
+            Update app
+            <ArrowUpRight className='ml-1 h-4 w-4' />
+          </Link>
+        </Button>
+      </AlertDescription>
+    </Alert>
+  )
+}
diff --git a/web/app/(app)/dashboard/layout.tsx b/web/app/(app)/dashboard/layout.tsx
index b71e4ad..e0e6cf7 100644
--- a/web/app/(app)/dashboard/layout.tsx
+++ b/web/app/(app)/dashboard/layout.tsx
@@ -5,8 +5,9 @@ import Link from 'next/link'
 import { usePathname } from 'next/navigation'
 import AccountDeletionAlert from './(components)/account-deletion-alert'
 import UpgradeToProAlert from './(components)/upgrade-to-pro-alert'
+import UpdateAppModal from './(components)/update-app-modal'
+import UpdateAppNotificationBar from './(components)/update-app-notification-bar'
 import VerifyEmailAlert from './(components)/verify-email-alert'
-import BlackFridayModal from './(components)/black-friday-modal'
 import { SurveyModal } from '@/components/shared/survey-modal'
 
 export default function DashboardLayout({
@@ -51,6 +52,7 @@ export default function DashboardLayout({
       {/* Main content with left padding to account for fixed sidebar */}
       <main className='flex-1 min-w-0 overflow-auto md:ml-24'>
         <div className='space-y-2 p-4'>
+          <UpdateAppNotificationBar />
           <VerifyEmailAlert />
           <AccountDeletionAlert />
           <UpgradeToProAlert />
@@ -93,6 +95,7 @@ export default function DashboardLayout({
       <div className='h-16 md:hidden'></div>
 
       <SurveyModal />
+      <UpdateAppModal />
     </div>
   )
 }