ChessAtlas vs Chessbook: which chess opening trainer wins in 2026?

It depends on how you train. Chessbook is native-mobile-first with a large opening library; it's a polished tool if you consume pre-made lines. ChessAtlas is built around YOUR repertoire: build it, sync games from Lichess and Chess.com, detect deviations automatically, and drill with FSRS. If you analyze your own games and want the full game-to-fix loop, ChessAtlas wins.

Chessbook surfaces mistakes from your imported online games against its course lines. ChessAtlas's Deviation Finder runs the same idea against your fully custom repertoire: it scans every imported Lichess and Chess.com game, flags the exact move where you left your prep, and schedules the correction with FSRS straight into your review queue. The difference is depth of customisation, not feature presence.

Partly. Chessbook has a free tier with a cap on how much repertoire you can store, and a paid Pro subscription above it. ChessAtlas is also free to start: 200 variations, 2 linked Lichess or Chess.com accounts, automatic deviation detection, and the full Course Library, with no credit card. The difference is what the paid plan buys: ChessAtlas Premium lifts capacity limits rather than unlocking features you could not otherwise reach.

Yes, a free tier capped at 400 moves; storing more repertoire than that needs the paid Pro subscription. ChessAtlas has a free plan as well: 200 variations of your own repertoire, 2 linked Lichess or Chess.com accounts, automatic deviation detection, and the full Course Library, no credit card.

It depends on how you study. If you want a polished native mobile app and a large, data-driven course library to drill, Chessbook does that well. If you want to train the exact lines you play and see where your real Lichess and Chess.com games left your preparation, that is the workflow ChessAtlas is built around. Both are free to try before you decide.

Yes, the free tier covers 200 variations and 2 linked accounts, with no credit card. Premium is $9.99/mo (or $6.99/mo billed annually) for unlimited variations and accounts.

FSRS (Free Spaced Repetition Scheduler), a research-backed algorithm that outperforms SM2 (used in Anki) and the generic SRS schemes used by most opening apps. In practice: fewer reviews for the same retention.

Yes. ChessAtlas imports PGN files, and the Course Library has pre-made opening courses if you want to start from something. You can also build from scratch in the Repertoire Builder in a few minutes.