Android app you can test it with

[yareach]

Try to install RB Klíč or RB Key in English. I tried to use it in Bluestacks and WSA under Windows 11 and it always detects it is an emulator.
To test it, you don't need to have an account. Just install the app. If it opens up a web page with security warning and stops, it detected an emulator. If you manage to slide up the title in the middle and get to registering your an account, it works.