DuoLearn

DuoLearn is a free, open-source learning application that helps people build deep understanding of any subject through interactive, bite-sized lessons. Inspired by Duolingo, DuoLearn applies proven cognitive science techniques — spaced repetition, confidence calibration, and progressive difficulty — to any topic.

The platform ships with coding interview preparation (algorithms and system design) and allows anyone to create courses on any subject. No account required. Optional Google Sign-In for leaderboards only.

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