It is not possible to transfer an app purchase or any in-app purchases between various versions of our apps on different platforms such as iOS (iPhone/iPad), Android (phones/tablets), or Mac/Windows computers. For example, a purchase of the AmpliTube app for iPhone will not open access to the AmpliTube app in the Google Play Store or on your Mac/Windows computer. Another example, a purchase of in-app content in the iGrand Piano app for Android will not transfer over to iGrand Piano for iPhone/iPad.