Thank you so much! I will definitely add those ideas to the roadmap in the README (pointing out this comment). I believe the spaced repetition feature must be

Thank you so much! I will definitely add those ideas to the roadmap in the README (pointing out this comment). 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.