A few things I've noticed:
* during my first review the "Skip" and "Reveal" buttons didn't seem to work for me. when I exited and re-entered, they worked but presented the same cards anyway. I'd expect skipping to mean that I'm skipping at least for this session, if not for this whole day.
* my leaderboard has two people, both with the same name. I imagine this is me? Unclear who the leaderboard would be comparing me to since it looks like it's subject-specific.
* nice that you don't have to sign up for an account and can just jump in right away.
More generally, the challenge I've found with using AI for Anki-style quizzing is the hallucination -- I'd hate to find out I invested time into learning & retaining something that turns out to be wrong. How do you think about this risk / do you do any interesting stuff on the back-end to mitigate?
Maybe if you put more information up front it would be a better proposition. You need more than a pitch going 'this product is the best!!!' for me to start investing time and giving out information.