Import lines from YouTube, Lichess, or raw PGN. Train with spaced repetition until every response is automatic.
Your repertoire lives in different places. We bring it all together.
Paste a video link. We extract every opening line from the instructor's analysis — validated move by move.
Connect your account and browse your studies, or paste any public study link. Chapters become lines instantly.
Paste raw PGN from anywhere — ChessBase, databases, your own notes. Multi-game files split automatically.
The same algorithm behind Anki, adapted for chess. Lines you nail fade into the background. Lines you botch keep coming back until they stick.
No locked courses. No subscriptions for content you already know. Build repertoires from your own analysis and drill exactly what matters to you.
Lines with shared moves merge into a branching tree. See where your variations diverge, spot gaps, and understand how your repertoire fits together.
Accuracy, review count, ease factor — per repertoire. Know exactly which openings are solid and which need more reps.
Free and open source. Import your lines and start drilling in under a minute.