Here's a few random suggestions: - spaced repetition. Again, anki style. - audio. Can you make it easy to record a phrase, anki style? Or maybe even make AI pronounce them correctly?
I would something like that.
I believe the spaced repetition feature must be prioritized because that's the most important thing in this app. I mean, what's the purpose of seeing the words over and over again if I already have confidence with them?
For the pronunciation feature, I had similar work before and there are great open source tools and libraries we can build upon that analyze your pronunciation and spot where you made mistakes. We can use open source TTS libraries to pronounce the correct version.
I also would definitely want to see audio questions in exercises similar to Duolingo, and it would be great to work on those features.
It also has audio and pronunciation. It is around the halfway mark in the demo.
Not: Bu benim en sevdiğim şarkılardan biridir!! (it's one my fav songs)
Ben de aşık ya! (Mine too!)