I've always been interested in spaced repetition but never had the patience to learn the "right" way to do it. This looks pretty helpful.
Do you think this AI x repetition concept works better for some types of learning than others?
Owl wasn't built with AI in mind, though. It isn't necessarily an AI product. We use it where it helps (analyzing a paper and creating cards to study that paper is very cool, for example). I think there are even more angles to explore, but we can't claim to have tried them all :-)