Is ChessAnalyser really free?
Yes. Unlimited game reviews at full engine strength, free. The analysis runs on your device, so serving it costs us nothing and we never need to charge for it.
FAQ
Questions before the first move.
Do I need an account?
No sign-up is needed to analyze games or study openings. An optional account is planned so you can save your games and progress across devices.
Can I import Chess.com and Lichess games?
Yes. You can paste or upload standard PGNs, fetch Lichess games by URL or username, and fetch Chess.com games from public monthly archives.
Where are my imported games saved?
On your device. Imported games and finished reports are stored in your browser, so recent games reopen instantly and nothing is uploaded anywhere.
Does the chess engine run on a server?
No. A full Stockfish engine runs inside your browser while you analyze. Your games stay on your device.
How are accuracy and move labels calculated?
Every position is evaluated by Stockfish, converted to win probability, and each move is classified by how much winning chance it kept or gave away. The report also shows a realistic played-like rating range for the game instead of an inflated score.