ChessAnalyzerFree chess game review with Stockfish 18
Every move rated from Brilliant to Blunder, your accuracy, the moments that decided the game — and openings and tactics to fix what you find. In your browser or on Android. No account.
What you get
Every move rated
Brilliant, Great, Best, Excellent, Good, Book, Inaccuracy, Mistake, Miss and Blunder — based on winning chances, so the labels are fair in every position. How it works
Accuracy and critical moments
See both players' accuracy, the evaluation graph, and the few moves that decided the game. About accuracy
Stockfish 18, locally
The engine runs on your device: depth, engine lines and evaluation, with nothing uploaded. Reading the engine
24 opening courses
Every move explained, with a practice mode that asks you to find the moves yourself. Browse openings
63 verified tactics puzzles
Forks, pins, skewers, mates and more — every solution checked by Stockfish 18. Train tactics
Your estimated rating
A performance estimate from the quality of your moves, with an honest error range. How it is estimated
How it works
- Import a game — paste PGN, drop a file, or fetch your games from Lichess or Chess.com by username. Step-by-step guide
- Run the review — Quick for a fast look, Smart Deep Review for a deep look at the moments that matter.
- Study the critical moments and turn each mistake into a lesson. A review routine that works
Popular openings
Italian Game
Fast development and a bishop aimed at f7, the weakest square in Black's camp. The classic first opening to learn with White.
Two Knights: the Fried Liver trap
A sharp attacking line. If Black recaptures on d5 with the knight, White can sacrifice on f7 and hunt the king into the open.
Ruy Lopez
The Spanish Game: slow, deep pressure on Black's centre. A lifetime opening played at every level.
Queen's Gambit Declined
White offers the c-pawn to deflect Black from the centre. Black declines and keeps a rock-solid position.
London System
A system you can play against almost anything: the same setup, easy plans, no theory to memorise.
Sicilian Najdorf
Black's fighting answer to 1.e4. Unbalanced positions where Black plays for a win.
Frequently asked questions
Is ChessAnalyzer free?
Yes. The web analyzer and the Android app are free. The Android app is supported by ads.
Do I need an account?
No. There is no sign-up. Your games, analyses and progress are stored on your own device.
Which engine does it use?
Stockfish 18, one of the strongest chess engines in the world, running directly in your browser or on your phone.
Does it work offline?
The Android app works fully offline. The web analyzer can be installed as an app and works offline after the first visit.
Can I import my games from other sites?
Yes: paste PGN, import a PGN file, or fetch your latest games from Lichess or Chess.com by username.