Free tool
Analyze your Chess.com games
Enter your Chess.com username and Audit Chess reviews your whole history with Stockfish - no PGN exporting, no login to Chess.com, no account here. Instead of one game at a time, you get the patterns across all of them: the openings that quietly cost you rating, the blunders you repeat, and the winning games you keep letting slip.
A username, not a folder of PGNs
Most analysis tools make you export a game, then paste it, then repeat. Audit Chess reads your games straight from the public Chess.com API by username, so the setup is a single field. It pulls your archives, runs Stockfish over every move in your browser - a fast depth-8 pass across the whole history, with deeper depth-14 searches on demand for puzzles and single-game review - and assembles the whole picture at once. If you would rather check a single game, you can still paste one into the free analysis tool.
What it finds in your Chess.com history
Every opening you play becomes an interactive tree ranked by your real results, so a line you score 30% with stops hiding inside a decent overall rating. It flags the winning positions you threw away, the forced mates you missed, and the blunders you make again and again - then turns those blunders into puzzles you can drill.
It also profiles your endgames and playing style, and maps when you play your best and worst chess across the day and week.
A free alternative to Chess.com Game Review
Chess.com’s built-in review is good for a guided walk through one game, but the full version sits behind a paywall and it only ever looks at a single game. Audit Chess is the complementary tool: free, whole-history, and pattern-focused. See the full breakdown in Audit Chess vs Chess.com Game Review, browse other Chess.com analysis alternatives, or, if you also play elsewhere, analyze your Lichess games.
What is Audit Chess?
Audit Chess is a chess analysis platform that reads your Chess.com or Lichess game history and identifies the recurring weaknesses, opening tendencies, blunders, blown wins, missed mates and endgame patterns that are hard to see from a single game. It runs Stockfish in your browser, needs no account, and never uploads your games.
What makes it different: most chess engines analyze one position or one game. Audit Chess focuses on the patterns across your whole history - and turns them into training, so your own blunders become Stockfish-verified puzzles and your weakest openings become concrete things to study.
Frequently asked questions
How do I analyze my Chess.com games?+
Enter your Chess.com username on Audit Chess. It pulls your public game archives, replays every game with Stockfish, and builds a profile: your openings ranked by result, the blunders you repeat, the winning positions you lose, your endgame and playstyle tendencies, and puzzles from your own mistakes. No account and no PGN exporting required.
Do I need to export a PGN from Chess.com first?+
No. Audit Chess reads your games directly from the public Chess.com API by username, so you never have to download or paste anything. If you only want to check one specific game, you can still paste its PGN into the free analysis tool.
Does it work with the Chess.com free account, and is my data safe?+
It works with any public Chess.com account - free or paid - and it only reads games your profile already makes public. The analysis runs entirely in your browser with Stockfish; nothing is uploaded to a server and no login to Chess.com is needed.
How is this different from Chess.com Game Review?+
Chess.com Game Review walks you through one game at a time and its full version is a paid feature. Audit Chess analyzes your whole history at once, for free, to find the patterns across games - which openings keep costing you, which mistakes you repeat, which wins you throw away. Many players use both.
How many games can it analyze?+
Hundreds. The whole-history pass is designed to score every move across your full archive in one run, then rank where your points actually go, so a large game count makes the patterns clearer rather than slower to read.
Audit Chess is free and not affiliated with Chess.com or Lichess.