COMPANY
About Us
Chess Analysis AI is a free, unlimitedchess analysis website for players who want to understand their games — not just see +2.1. We run Stockfish 16 directly in your browser, grade every move from Brilliant to Blunder, and explain each mistake in plain language. No signup, no daily limit, no upload queue.
Why we built this
Most "free chess analysis" ends after one game per day — right when you're motivated to fix what went wrong. We were tired of the paywall appearing after every loss. So we built the tool we wanted for our own training: paste a PGN or enter a username, get accuracy, eval graph, best lines, and one-sentence "why" notes in seconds — for as many games as you want, on phone or desktop.
What makes us different
- Truly unlimited & free — blitz to classical, your whole history, no account.
- Private by design — analysis runs 100% on your device via WebAssembly. See our Privacy Policy.
- Explains, not just scores — "knight fork wins the rook — king must move" beats staring at +2.1.
- Training loop — game review → analysis board → opening drills → Elo tracking, all linked.
What we offer
- Free Game Review — accuracy, move grades, coach notes, shareable reports.
- Analysis Board — explore any position with live engine lines.
- Opening Trainer — 20 lines with ideas, traps, and watch-it-played drills.
- Free tools — Elo calculator, board editor, chess clock, and more.
Independence & fair play
We are an independent platform, not affiliated with, endorsed, or sponsored by Chess.com, Lichess, FIDE, or the Stockfish team. Engine: Stockfish (open-source, GPL). Pieces: Cburnett set (CC BY-SA). We support fair play unconditionally: use our engine for study and review — never to cheat in rated games. Read ourTerms & Conditions.
Analyze your last loss — free, in seconds
Join thousands of players turning blunders into lessons every week.