The iOS version is avaiable here: https://apps.apple.com/de/app/testbirds-companion/id1512755199
...or via this QR code:
The Play Store version can be accessed here: https://play.google.com/store/apps/details?id=com.testbirds.tester
...or via this QR code:
The Testbirds Companion is be available on the following devices:
iPhones – iOS versions 13 and over
Android phones – Android 6 and over
The Testbirds Companion App is currently only available in English and German