There is one large problem specifically for my use case in learning japanese: The AI voice orchestration layer has issues — the TTS does not work perfectly and mispronounces words and adds syllables where there shouldn't be any. Maybe you can look to add a separate (mark as recommended for japanese) japanese teacher with a different TTS module? That would instantly make me subscribe to the service, and i bet many others feel the same. Dear Development Team, i love the app design.