AppOnSD is a free utility tool for Android devices developed by incpro. Its main function is to move apps stored in internal storage to the SD card. However, this feature may not be available depending on the Android version. The program has three lists: the first one shows apps that can be installed on an SD card, the second one shows apps installed on the SD card or that can be moved to internal storage, and the third one shows apps that are only installed in internal storage. The app also provides brief information about each app and sends a message notification when an app is updated.

To use AppOnSD, select an app from the list and then choose "Change storage location" in the "Application Manager" screen. This utility tool is a great option for those who need to free up space on their Android device and optimize its performance.