AppChecker – App & System info displays the TargetAPI of all your installed apps. This allows you to check which of your apps already support the latest features of your Android system.
The latest update allows you to check some system information such as screen size and resolution, your processor and memory information. It also allows you to check your DRM status, e.g. the Widevine security level.
New displays the AndroidManifest.xml file of any application.
If you’re using Android 6 Marshmallow or later, this app helps you check which of your apps already support the new granular permission settings.
Google Guidelines:
To allow an application to take advantage of these changes and ensure that it adapts to the style of each user’s device, an application developer should set the targetSdkVersion value to match the latest Android version available.