Open-source, browser-local chess opening trainer — drill your repertoire with spaced repetition. No account, no server.
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Updated
Jun 21, 2026 - JavaScript
Open-source, browser-local chess opening trainer — drill your repertoire with spaced repetition. No account, no server.
Free, unlimited chess game review in your browser — Stockfish 18 (WASM), 11k tactics, FSRS trainer, openings & endgames, weakness analyzer.
Personal chess opening trainer for macOS — repertoire training, spaced repetition, Stockfish analysis, Lichess explorer. Qt/PySide6, GPLv3.
Play against Stockfish with real-time move grading, plus an opening trainer: 3810-opening ECO book, FSRS spaced repetition, and a pawn-structure engine that explains the why.
Learn the Cow opening (e3, d3, Ne2, Nd2, Nb3, Ng3) — lessons, hint ladder, drill mode with a built-in engine
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