I'm working on Kanji Palace (https://kanjipalace.com).
It's an app to learn Japanese language with AI. It has visual mnemonic images, JLPT progress tracker, Kanji info graphic, etc.
Later, I will add AI-comic creation based on Kanji characters you've selected.
I know 4 languages. 3 of those I learnt because of my family. I learnt Russian because of work (+fun). I feel that it is always best to go the classic route and learn a language from a manual (currently learning mandarin from a manual) and that gamified experiences of learning languages have a very low learning/effort ratio.