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App Version Check / Update Notifications

2 Min. reading time App-Funktionalitäten

The App Version Check verifies whether the user is using the latest version of the app. If not, the app can display an update notification so that the user can install the latest update—either from the App Store or directly via Over-the-Air (OTA). This ensures that all users have access to new features, bug fixes, and security updates.

🔧 Technical Explanation

In Expo-compatible React Native apps, the version is determined using system-specific constants and, if necessary, backend checks. There are two main scenarios:

1. Over-the-Air (OTA) Updates with Expo

  • Expo updates can deliver minor changes (UI, logic, text) without a new app store release
  • Use expo-updates for:
    • automatic check at startup (checkForUpdate())
    • Notification when an update is available (fetchUpdate())
    • App restart after installation (reloadAsync())

2. Check Store Version (App Store / Play Store)

  • The app compares the local version (expo-constants.manifest.version) with the current store version (e.g., via API or a manually maintained version on the server)
  • If the version is out of date:
    • Display an update notification
    • Force an update if necessary

Tools & Modules:

  • expo-updates – OTA updates & version check
  • expo-constants – current app version information
  • expo-linking – Redirect to the store page
  • Custom API endpoints for maintaining and controlling the minimum version

💡 Use Cases

  • Prevent error messages by blocking old versions
  • Notify users about new features (release notes with “What’s New?”)
  • OTA updates for quick bug fixes
  • Manage versions based on user tenant or region
  • Enforce optional or mandatory updates

❓ Important Questions and Answers About App Version & Update Checks

How does the app detect if an update is available? By comparing the installed version (locally) with the server version or by using expo-updates.checkForUpdate() for OTA updates. What is the difference between an OTA update and a store update?

  • OTA update: Immediate, without the App Store, for code & UI
  • Store update: For new native modules or permissions – requires App Store approval Can updates be installed automatically? Yes—using expo-updates.autoUpdate or fetchUpdate() + reloadAsync(). However, users can also be notified and prompted manually. How do I redirect users directly to the App Store? Use Linking.openURL() to the App Store or Play Store URL. The URL is version-dependent and must be maintained. Can I force updates based on the user? Yes—with a backend check, you can define minimum versions and, for example, display a block screen or update dialog for older versions.