ChessAtlas vs Chessbook: which chess opening trainer wins in 2026?
Both apps train chess openings with spaced repetition. The real difference is whether you want to consume pre-made courses or actually close the loop between your games and your repertoire. Here's the honest comparison.
Feature comparison
| Feature | Chessbook | ChessAtlas |
|---|---|---|
| Free tier size | 400 moves | 200 variations |
| Spaced repetition algorithm | Generic SRS | FSRS (research-backed) |
| Repertoire Builder | Build or pick | Build from scratch, PGN import, Course Library |
| Deviation Finder (from real games) | Against course lines | Against your custom repertoire, FSRS-scheduled |
| Game import (Lichess / Chess.com) | Supported | Both, automatic |
| Native mobile app | Yes (their core strength) | Web + responsive (app on roadmap) |
| Opening course library | Extensive data-driven | Growing + build-your-own |
| Price (paid) | Pro subscription | $9.99/mo Premium (or $6.99/mo annual) |
Why pick ChessAtlas
You close the full loop: play → detect → fix → drill
ChessAtlas imports your Lichess and Chess.com games, detects where you left your prep, adds the correction to your review queue, and schedules it with FSRS. That full loop is our core feature, running against your fully custom repertoire and with FSRS scheduling for each flagged position.
FSRS, not generic SRS
FSRS is a research-backed algorithm trained on hundreds of millions of real review logs. For the same retention, it schedules ~30% fewer reviews than SM2 (what Anki and most opening apps still use). See how it works.
Better pricing
ChessAtlas Premium is $9.99/mo (or $6.99/mo billed annually), in the same range as Chessbook's paid plan and with the same feature depth. The free tier gives you 200 variations before any commitment, no credit card needed.
Where Chessbook still wins
To be fair: Chessbook has a polished, actively-developed native mobile app, and their opening course library is deeply data-driven with win-rate stats by ELO. If you train on the bus and care mostly about browsing a large catalog of expert courses, Chessbook is a solid choice. If you care about YOUR games becoming YOUR corrections, ChessAtlas is built for that.
Frequently asked questions
Which is better, ChessAtlas or Chessbook?
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.
Does Chessbook have deviation detection?
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.
Is ChessAtlas free?
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.
What spaced repetition algorithm does ChessAtlas use?
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.
Can I import my existing repertoire?
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.
Try ChessAtlas, free forever on the starter tier
Import your Lichess or Chess.com games, let Deviation Finder flag your gaps, and drill them with FSRS. 2 minutes to first review.
Create free account