Siren
Notify users when a new version of your app is available
Notify users when a new version of your app is available and prompt them to upgrade. Siren checks a user's currently installed version of your iOS app against the version that is currently available in the App Store. If a new version is available, a language localized alert can be presented to the user informing them of the newer version, and giving them the option to update the application. Alternatively, Siren can notify your app through alternative means, such as a custom user interface...