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.
Last updated: July 10, 2026
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) | Yes (iOS + Android), plus full web app |
| 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 typically schedules 15–30% fewer reviews than SM2 (the 1980s-era algorithm that powered Anki by default until Anki 23.10 (late 2023) and is still used in ChessFlare and most other SRS tools) for the same retention rate.
Is ChessFlare free?
Partly. ChessFlare has a Free plan at $0 per month that covers repertoire creation and PGN import, with unlimited training and full web plus mobile sync reserved for Pro. ChessAtlas is free to start as well, and its paid plan works differently: it lifts capacity limits instead of gating training modes. On the free plan you build up to 200 variations, link 2 Lichess or Chess.com accounts, get automatic deviation detection, and review all of it with FSRS spaced repetition.
How much does ChessFlare cost?
ChessFlare Pro is $6.49 per month, or $4.99 per month billed annually at $59.99 per year with a 7-day trial, or $110 once for lifetime access (prices published on chessflare.com, checked August 2026). ChessAtlas Premium is $9.99 per month, or $6.99 per month billed annually, and it removes the variation and linked-account limits rather than unlocking training features.
Is ChessAtlas free?
Yes, the free tier includes 200 variations, 2 linked accounts, deviation detection, and access to the Course Library. No credit card.
Does ChessAtlas work on mobile?
Yes. ChessAtlas has native iOS and Android apps, and the web app works on any device including mobile browsers. ChessFlare also ships native mobile apps.
See all ChessAtlas comparisons
ChessAtlas is an independent product and is not affiliated with, endorsed by, or sponsored by ChessFlare. ChessFlare, its logo and its screenshots are the property of their respective owner. This comparison is written and maintained by the ChessAtlas team.
Start training with FSRS + Deviation Finder
Free tier · no credit card · import your games in 30 seconds
Create free account