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Catch the FlawCatchtheFlaw

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Create a lesson

A lesson made from your mistakes

Pick a subject. Lumi reads your history in it, finds what trips you up most, and the AI writes a new mystery on exactly that.

Catch the Flaw

A five-minute misconception practice. Progress stays in this browser. Lumi is a character who is wrong on purpose — not a live tutor who will help you.

Start learning Sticker book Why this works For parents How it works

Demo: fill this browser with an example learner's practice.

© Rajat Khanduri · September 2026