I'm not sure if this is exactly what you're looking for, but I've been working on a spaced repetition app[0] recently that supports markdown for cards, as well

I'm not sure if this is exactly what you're looking for, but I've been working on a spaced repetition app[0] recently that supports markdown for cards, as well as the ability to convert markdown notes into cards. [0] https://mochi.cards https://mochi.cards