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Hi Jonathan, Thank you for your post. You should use WhisperSync feature of GameCircle to persist app data in cloud and share those across the apps. SharedPreferences could be a solution but it can save and share the data in a device locally. But you integrate WhisperSync in your apps, you can share the data (users progress in all the apps) across all the apps for an Amazon user registered in many devices. To do that you should create a security profile, and all of your apps should use that profile with different api keys what are created by registering the package names and the MD5 fingerprint of the certificates you are using to sign the apps. Please refer below links for better understanding of GameCircle features: https://developer.amazon.com/sdk/gamecircle.html https://developer.amazon.com/sdk/gamecircle/documentation/gamecircle-config.html https://developer.amazon.com/sdk/gamecircle/documentation/gamecircle-init.html https://developer.amazon.com/sdk/gamecircle/documentation/whispersync.html You could certainly submit 2 different apps that have have the same main class.

I am still a new developer, but my understanding is that SharedPreferences will not allow you to share data between applications (at least not currently). There were some discussions about that at StackOverflow, one of which pointed to the Android documentation for SharedPreference, which still warns that "currently this class does not support use across multiple processes. This will be added later."

developer.android.com/reference/android/content/SharedPreferences.html

Hi, I already recommended you to use WhisperSync feature of GameCircle to persist app data in cloud and share those across the apps.