This app is 100% open source! You can find the source code here:
https://github.com/1nikolas/play-integrity-checker-app
This app shows info about your device integrity as reported by Google Play Services. If any of this fails could mean your device is rooted or tampered in a way (for example having an unlocked bootloader).
Note: Google has a 10k requests/day limit. If it stops working it's probably that.
Data safety
Safety starts with understanding how developers
collect and share your data. Data privacy and security practices may vary based
on your use, region, and age. The developer provided this information and may
update it over time.