LearnClash

LearnClash is a competitive learning app for curious teens and adults (13+). Play 1v1 quiz duels on the topics you care about, then revisit missed questions through spaced repetition. Turns are asynchronous, with optional live play when both players join. Solo, Daily Clash and clearly labeled AI rivals give you something to play while friends are away. Free on iOS and Android, with no ads in any tier.