This app was mentioned in 2 comments, with an average of 1.00 upvote
It's a navigation app with bicycle routes. Funny enough I could also not find it in the playstore when looking for it (was recommended by a friend); but searching for the playstore link on google worked - here it is:
https://play.google.com/store/apps/details?id=org.selfip.leinad.android.bbbike&hl=en
Gibts auch als App, man muss nur gut suchen :) UX allerdings auch übel, aber die sache 💯 wert.
https://play.google.com/store/apps/details?id=org.selfip.leinad.android.bbbike