KeyCheck is a Flutter app that allows you to check if a Bitcoin wallet’s private key matches the public address.
This app may be useful for validating paper wallets.
You can get the source code for this app on Github at https://github.com/imprologic/keycheck
Since the privacy of a Bitcoin wallet’s private key is paramount, we chose not to provide an installable app. If you want to use this app, you would have to clone the above repository and build / deploy it yourself.