Show HN: DER DIE DAS – learn German noun gender with spaced repetition and games

I built this app for my language buddy who is learning German (while he teaches me Chinese). He struggled so much with German articles/determiners. So I made this, it also teaches article changes and noun declensions. There is spaced repetition, audio loops, multi-player games, some cultural lessons and more. It would be nice to get some feedback from German learners!