SPIC - Play Integrity Checker APP
The received integrity verdict from the APIs can be check locally on the device or send to a remote server so they can be validated there. The remote server implementation has to be self hosted for now.
The app is OpenSource and the source code of the android app as well as the server implementation can be found on Github (see /herzhenr/SPIC-android and /herzhenr/SPIC-server)