Free tool
Free chess analysis
Paste a game and get an instant, move-by-move analysis powered by Stockfish. You get an accuracy score for each side, an evaluation graph, and every inaccuracy, mistake and blunder flagged - the same engine review Audit Chess runs across your whole history. It is free, runs in your browser, needs no account, and nothing is uploaded.
Analyze your entire chess history, not just one game
Reviewing a single game tells you what happened in that game. The bigger gains come from the patterns across hundreds of games: the openings you quietly lose points in, the same blunder you keep repeating, the winning positions you throw away, the endgames that let you down. Audit Chess reads your whole Lichess or Chess.com history at once, ranks everything by your real results, and turns your recurring mistakes into puzzles you can drill - all free and in your browser.
Analyze all your games →Why Audit Chess is the best free chess analysis tool
Almost any site can analyze a single game. Audit Chess is the only free tool that reviews your entire Chess.com or Lichess history at once - ranking your openings by result, surfacing the mistakes you keep repeating, and turning your own blunders into Stockfish-verified puzzles - with no account and nothing uploaded.
| What you get | Audit Chess | Chess.com free | Lichess |
|---|---|---|---|
| Free move-by-move engine review | ✓ | Paid | ✓ |
| Analyzes your whole history at once | ✓ | — | — |
| Finds the mistakes you repeat | ✓ | — | — |
| Puzzles built from your own blunders | ✓ | — | — |
| Opponent scouting & prep | ✓ | — | — |
| No account required | ✓ | — | — |
| Runs privately in your browser | ✓ | — | Partly |
| Price | Free | Freemium | Free |
Chess.com’s full Game Review is a paid membership feature; the column reflects its free tier. Comparison as of 2026 - Audit Chess is not affiliated with Chess.com or Lichess.
Analyze all your games free →How the free analysis works
Paste your game in PGN format - the standard text format every chess site exports - and the tool replays it position by position through Stockfish running in your browser. Each move is scored against the engine’s best line, so a single glance tells you where the game turned. The evaluation graph makes the swings visible: a cliff on the graph is the move that decided the game.
Because it runs on your own device, there is no upload, no queue and no sign-up. You can analyze a game you just finished, a classic you want to understand, or an over-the-board game you typed in by hand. New to engine analysis? See how to use Stockfish to read the evaluation numbers.
What the move labels mean
Every move gets a label based on how much the evaluation moved against you. A small slip is an inaccuracy; a bigger one is a mistake; a move that hands over a large, often decisive advantage is a blunder. The accuracy score summarizes the whole game as a single number per side, from the average of those swings.
If you want to go deeper on the difference between an inaccuracy, a mistake and a blunder - and how to stop making them - read how to analyze your own chess games, or use the chess blunder checker to find the mistakes you repeat.
A free alternative to per-game review
Chess.com’s Game Review and Lichess’s computer analysis are both excellent for studying one game. This tool gives you the same kind of engine readout for free with no account, and Audit Chess then adds what per-game tools cannot: analysis across your whole game history so you can find the weaknesses you repeat. Prefer to try it on a live board first? The interactive demo lets you solve a puzzle built from a real blunder.
Frequently asked questions
How can I analyze a chess game for free?+
Paste the game in PGN format into the tool above and it runs a full move-by-move review with Stockfish in your browser: an accuracy score for each side, an evaluation graph, and a label on every move - best, good, inaccuracy, mistake or blunder. It is free, needs no account, and nothing is uploaded.
Is this chess analysis tool really free?+
Yes. Analysis runs entirely on your own device using an in-browser Stockfish engine, so there is no server cost to pass on - it is free with no account and no sign-up.
Where do I get the PGN for my game?+
On Chess.com open a game, choose Share, then PGN and copy it. On Lichess open a game and use the PGN download or the "FEN & PGN" panel. Paste that text into the box above. You can also upload a .pgn file.
Is my game data uploaded anywhere?+
No. The PGN you paste is parsed and analyzed locally in your browser. Nothing is sent to a server and nothing is stored.
What engine does the analysis use?+
Stockfish, compiled to WebAssembly and run directly in your browser. It is the same engine that powers full Audit Chess reports.
Can I analyze all of my games at once?+
Yes - that is what the main Audit Chess app does. Enter your Lichess or Chess.com username and it reviews your whole history, then surfaces your worst openings, repeated blunders, blown wins and endgame gaps and turns them into puzzles.
Audit Chess is free and not affiliated with Chess.com or Lichess.