Built by a player, for players

Why ChessAtlas exists

Most chess opening tools fall into one of two camps. On one side, course platforms sell you a grandmaster’s polished repertoire and ask you to memorize it. On the other, game databases let you look up any move from any game ever played. Both are useful. Neither answers the question every improving club player actually has: I prepared this line, I played this line, I lost. Where did I leave my preparation, and what should I study next?

ChessAtlas is built end-to-end around that loop. You build a repertoire (or fork one from the library). You link your Lichess or Chess.com account. The app watches your games, detects the exact move where you left your prep, and surfaces that position back into spaced-repetition training. The lines you keep forgetting come back more often. The lines you know cold drop off the schedule. That is the whole product.

What makes it different

• FSRS, not SM2. FSRS is a research-backed spaced-repetition algorithm trained on hundreds of millions of real Anki reviews. For the same retention it typically schedules 15–30% fewer reviews than SM2, the 1980s algorithm most chess trainers still ship with.
• Deviation Finder. Import your recent games and ChessAtlas surfaces the exact move where you (or your opponent) left your repertoire. The position lands back in your training queue automatically.
• Your repertoire is yours. The free tier includes a full repertoire builder with 200 variations, no course purchase required. Import PGN, edit the tree, add comments. Premium just lifts the variation cap.
• Six languages. The app runs in English, French, Spanish, German, Portuguese, and Hindi. The UI and training engine are fully translated; the learning content prioritizes the languages where we have native reviewers.

About Antoine

I am the founder and lead engineer behind ChessAtlas. I have been playing chess since I was a teenager and have spent most of my career shipping software, most of it in fintech and education-adjacent tools. ChessAtlas started as a personal frustration: I would prepare a line before a weekend tournament, play it, and six weeks later not remember whether my thirteenth-move idea was correct. The solution, obvious in hindsight, was spaced repetition plus automatic game review. None of the tools on the market did both. So I built one.

I am a club-level player, not a master. The GM-annotated content you find on ChessAtlas comes from sources we cite explicitly (see our editorial policy); everything I write personally is UX, product, and the construction side of repertoire building, which is what I actually know well.

You can find me on GitHub, on Twitter/X as @chessatlas, or on our Discord. If you have a repertoire question or a bug report, Discord is the fastest channel; anything more substantive comes through contact.

How we handle accuracy

Chess content on the internet has a serious hallucination problem: invented win rates, fake GM games, move orders that do not work in any real position. Our editorial policy documents every guardrail we ship with, including the PGN validation every opening page passes before publication, and the rule that no statistic appears on the site without a cited source.

The company

ChessAtlas is operated by ANKT SERVICES, a registered French company. Full legal entity details are on the Terms of Service and Terms of Sale pages. Pricing is listed on the pricing page — the free tier is permanent, not a trial.