The startup I'm working on is a flashcard mobile webapp that uses spaced repetition, but also uses multiple choice quizzes for new cards that get harder each ti

The startup I'm working on is a flashcard mobile webapp that uses spaced repetition, but also uses multiple choice quizzes for new cards that get harder each time a card is shown again. This lets students transition from answer recognition to answer recollection without that anxious feeling that comes from trying to recall recently learned cards. It was designed for adults learning vocabulary for second languages or professional certifications, but lately we've been trying to see what kinds of features we could add to make it more useful for kids as well. The recognize-to-recall transition could really be useful for students who otherwise would be overwhelmed from the anxious feelings of recalling recently new cards. One feature we're looking at is the use of mini games and tiny (10-15 second) video clips to make the app more fun and help space out new cards a bit more. If anyone has a child who could benefit from reduced-anxiety learning, I'd love to chat with you and get your thoughts. Check out my HN profile for my contact info and more about the webapp.