ChessAtlas vs ChessFlare: the honest 2026 comparison
Both tools help chess players train their opening repertoire, and both come from small indie teams. But the features, algorithm, and platform coverage differ in ways that matter for serious repertoire work. Here's what to know.
Feature comparison
| Feature | ChessFlare | ChessAtlas |
|---|---|---|
| Spaced repetition algorithm | SM2 (older) | FSRS (research-backed) |
| Game import | Lichess | Lichess + Chess.com (both) |
| Deviation Finder (auto) | Not offered | Free on all tiers |
| Course Library | Limited | Growing expert library + build-your-own |
| Languages | FR / EN | EN / FR / ES / DE / PT / HI |
| Native mobile app | iOS + Android (their strength) | Web + responsive (app planned) |
| Price (paid) | Freemium | $9.99/mo Premium (or $6.99/mo annual) |
Why pick ChessAtlas
FSRS algorithm is measurably better
FSRS is a modern spaced repetition algorithm trained on millions of review logs, outperforming SM2 (used by ChessFlare and most legacy SRS tools) with about 30% fewer reviews for the same retention. See how ChessAtlas uses FSRS.
Deviation Finder closes the loop
ChessAtlas automatically scans your real Lichess and Chess.com games, finds the exact move where you left your prep, and adds the correction to your drill queue. This is the whole point of training a repertoire, and it's a feature ChessFlare doesn't offer.
6 languages, real coverage
ChessAtlas is fully translated in English, French, Spanish, German, Portuguese, and Hindi. If you play chess in any of these languages, you get native UI and course content, not just cosmetic translations.
Where ChessFlare wins
ChessFlare ships native iOS and Android apps with offline training, a real advantage if you commute or train on the go. It's a solid solo-built product from an independent French developer with a loyal community. If mobile-first and offline are your top priorities, ChessFlare is worth trying alongside ChessAtlas.
Frequently asked questions
ChessAtlas or ChessFlare, which is better?
ChessFlare is a solid solo-built French product with native iOS and Android apps. ChessAtlas offers a more advanced spaced repetition algorithm (FSRS vs SM2), automatic deviation detection from your real games, 6 languages, and a full Course Library. If you want the strongest web-based training experience with deeper algorithmic work, ChessAtlas is the better choice.
Does ChessFlare support Chess.com?
ChessFlare primarily targets Lichess. ChessAtlas supports both Lichess and Chess.com automatically, so your full game history across platforms can feed into deviation detection.
What is FSRS and how does it compare to SM2?
FSRS (Free Spaced Repetition Scheduler) is a research-backed algorithm trained on hundreds of millions of real Anki review logs. It schedules reviews with about 30% fewer cards than SM2 (the 1980s-era algorithm used in Anki, ChessFlare and most other SRS tools) for the same retention rate.
Is ChessAtlas free?
Yes, the free tier includes 200 variations, 1 linked account, deviation detection, and access to the Course Library. No credit card.
Does ChessAtlas work on mobile?
ChessAtlas is a web app that works on any device including mobile browsers. A native iOS/Android app is on the roadmap. ChessFlare's native apps are its strength if you need offline training on the go.
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