Migrate Helper is a free Android app developed by BaltiApps that serves as a backup-restore assistant. It is specifically designed to work in tandem with a backup-restore app and helps you seamlessly migrate your data to a new device or ROM. The app requires the WRITE_EXTERNAL_STORAGE permission to store TWRP zip files for uninstalling the helper.

To use Migrate Helper, you first need to take a migrate backup. Then, boot to TWRP and flash the zips as explained in the app's "Restore by TWRP" section. Once done, boot up the ROM and click on the helper notification to continue restoring. Migrate Helper is an easy-to-use app that simplifies the backup and restore process, ensuring that your data is safe and secure.