ChessyAI Chess Coach appEvery tool, and when to use it
All of these tools are free and need nothing but a username or a position. Game data comes from the public Chess.com and Lichess APIs, the same games anyone can see on your profile, and the Stockfish engine runs in your own browser. There is no sign-up and no password.
Improve your games
- Free Game Review: pick one of your recent games and get accuracy, a label for every move (from best to blunder, plus great moves and misses) and an eval graph. Then it scans your last 30 to 50 games for the one mistake you keep repeating. Use it after any loss.
- Chess Weakness Report: analyzes your last 25 to 50 games and draws your Rating DNA across tactics, openings, endgame, time management, conversion and resilience, with your three biggest weaknesses ranked. Use it once a month to see what to work on.
- Analysis Board: Stockfish 18 with an eval bar, the engine's best lines, a board editor for any position and PGN import. Share a position with a link. Use it to check one position or go through a game by hand.
- Why Am I Stuck at My Rating?: looks at your games for the reasons players stall at a level. Use it when your rating hasn't moved in months.
Understand your habits
- Tilt & Bad Hours Detector: your best and worst hours and days, your win rate after one, two and three losses in a row, and how many games you can play in one sitting before your results drop. Use it if you tend to play "one more game" after a loss.
- Rating Converter: estimates your rating across Chess.com, Lichess and FIDE and shows your percentile. There is no official conversion, so it gives honest estimates and explains why. Each level has its own page, for example is 1200 a good chess rating?
Just for fun
- Roast My Chess: a savage-but-friendly roast of your account, written from your real stats: blunders, your worst opening, your worst hour, tilt streaks and flagging. Every joke is backed by a number from your games.
- Chess Wrapped 2026: your year in review as shareable cards: games played, best win, most-played opening, best time of day and your player type.
Where to start
If you've never looked closely at your games, start with the weakness report. It gives you the big picture in one go. Then use the game review on a few losses to see the actual moves behind it. If the report points to something outside the board, like bad hours or losing streaks, the tilt detector fills in the details.
And if you just want a laugh first, run the roast. It covers the same weaknesses with jokes.
How these tools work
When you enter a username, the tool requests your recent games from the Chess.com or Lichess public API. Only public games are used. Moves are checked by Stockfish, a free and open-source engine, compiled to run in your browser. That's why longer analyses depend on your device: a computer is faster than a phone. The roast and some short summaries are written by an AI model, which only gets the stats from your games and is told not to add any of its own.
The numbers are honest estimates. Accuracy formulas differ between tools, rating conversions are approximate and small samples are noisy. We say so wherever it matters.
Guides to go with the tools
The tools show you what's happening. The guides explain what to do about it. Good places to start: how to find your chess weaknesses, how to analyze your chess games and how to stop hanging pieces. All of them are in the guides section.
These tools come from the team behind Chessy — AI Chess Coach app, which does all of this automatically after every game, builds puzzles from your own mistakes and gives you a coach who has read your games.