RWTHapp is available on F-Droid via a repository.

F-Droid is a Google Play Store alternative through which you can download the RWTHapp. Just like Google Play Store F-Droid offers automatic updates and verifies the authenticity of apps. F-Droid can be downloaded from the project’s website and is updated automatically.

To find the RWTHapp on F-Droid, add a new repository. Enter https://app.rwth-aachen.de/fdroid/repo. After refreshing the repository you can find and download the RWTHapp under available apps.