Free tool
Chess performance analyzer
Your rating is one number hiding a dozen stories. This analyzer breaks it apart - your records by time control, your best and worst hours, month-by-month trends and your playing sessions - so you can see when and how you actually win. Built from your real Chess.com and Lichess games, free, no account.
What it measures
Every stat here is computed from your own games - no self-report, no guesswork:
Records and streaks
Overall win/draw/loss and your best and worst runs - the longest winning streak, the losing skid you want to avoid repeating, and your record against higher- and lower-rated opponents.
By time control
Bullet, blitz, rapid and daily split out separately, because a healthy rapid score can hide a bullet habit that is quietly costing you rating and confidence.
By hour and day
When you actually play well. Many players score far better in the morning than late at night, or crater on a particular day - the analyzer puts a number on it.
Monthly trends
Month-by-month results so improvement (or a slump) shows up as a trend, not a single noisy rating reading.
Sessions and tilt
Games grouped into sessions by the gaps between them, so you can see whether your results hold up over a long sitting or fall off after the third game - the classic tilt signature.
Opponents
How you fare across the range of opponents you meet, so a good record built only on weaker players does not read as strength.
Chess statistics, not just a rating graph
A rating graph tells you the score went up or down. Chess statistics tell you why. When you look at your play as data - win rate by format, results by hour, how a session decays - the things you can actually change come into focus: play rapid instead of bullet when it matters, stop after two losses, avoid rated games at midnight. None of that is visible in a single rating line.
These are the same analytics behind the activity insights in your report - surfaced here as a dedicated statistics view so you can read your numbers first and dig into the chess second.
From statistics to a fix
Statistics point at when you lose; the rest of Audit Chess explains what to do about it. Once the stats flag a problem, rank your openings by result, find the weaknesses behind the losing streaks, and turn your repeated blunders into practice with a full game analysis. For the mindset side, read how to stop losing winning positions.
Who is it for?
Stuck-rating players
When the number will not move, the reason is usually in the stats - a time control that drags you down, or a time of day you should not be playing rated. See it in one screen.
Data-minded improvers
If you like knowing your numbers, this is your dashboard: records, splits, trends and sessions, all from your real games rather than a self-report.
Anyone who suspects they tilt
Session analysis shows exactly where a sitting goes wrong, so you learn when to stop instead of chasing losses.
Coaches
Get a student’s performance profile - formats, timing, consistency - before the first lesson, so you know where the leaks are not just on the board.
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
What does the chess performance analyzer measure?+
Your results across your whole history: overall and by time control, your best and worst records, win and loss streaks, how you perform by hour of day and day of week, month-by-month trends, and your playing sessions - including how your results hold up as a session gets longer. It is built entirely from your Chess.com and Lichess games.
Is this the same as a rating graph?+
No - a rating graph shows one line going up or down. A performance analyzer breaks that line apart: it shows that you score 58% in the morning but 41% after 9pm, that your third game in a session is where results dip, or that blitz is dragging your confidence while your rapid is climbing. Those are the statistics a single rating number hides.
How is performance different from game analysis?+
Statistics tell you when and how much you win; analysis tells you what to fix. The performance analyzer finds the patterns in your results - times, formats, sessions - and the game analysis explains the chess behind them, ranking your openings by result and turning repeated blunders into puzzles. They answer different halves of the same question.
Do I need an account or to upload anything?+
No. Enter your Chess.com or Lichess username and it reads your public games straight from their APIs - no export, no login, nothing uploaded. The stats are computed in your browser.
Audit Chess is free and not affiliated with Chess.com or Lichess.