Free chess game analysis
Find out why you lost that game.
Paste it in and see every mistake, because knowing exactly where it went wrong is how you stop repeating it. Free, unlimited, no account.
Seeing the mistake is step one. Not repeating it is the goal.
Analysis shows you what went wrong in one game. The same kind of miss can show up in other games, and a single game can't show you that. A free account can keep the game, so you can train the pattern instead of one position.
Find your repeat mistake
Scan your last 4 public games and see the slip that costs the most, so you can see what keeps coming back.
Train it away
The chamber can turn a mistake from your games into a short drill, so you can practice the move that was there.
Keep everything
Save the game on this device, so you can open it again after you leave this page.
The analysis above stays free and unlimited either way. A free account just means you keep what you find.
Free stays free
The Leak-Fix Plan
The analysis on this page stays free and unlimited. When you want that scan across more of your games, Pro is The Leak-Fix Plan.
The Wide Window
100 games priced, not 30. A repeated cost has more games to show up in.
Scan on Demand
Played tonight? Scan tonight. No weekly wait.
The Full Repertoire
Every opening tree you play, trained to Master depth with no hints.
No Ceiling
No heart cap, unlimited decks, studies, and share links. Your library and streak on every device, with 2 freezes.
Cancel in Settings anytime. Pro stays on until your paid period ends. Export your decks on any plan.
See the planFAQ
Is it really free and unlimited? What's the catch?
Yes. You can analyze as many games as you want on this page, because Stockfish runs in your browser and this page does not meter it. The catch is that the page forgets the game when you leave, so you can create a free account when you want to keep it.
Do I need an account?
No. You can paste a game or a public username and see the mistakes with no account, because the engine runs on your device. An account is only for saving the game and for the training tools.
Is my game saved or shared?
Not from this page. The game stays in your browser, because a username lookup goes straight from your browser to Chess.com or Lichess, so you can see a public game without uploading it here. If you save it, it goes into your library on this device. This page does not share your game.
How do I get my game in?
Paste a PGN, or type your Chess.com or Lichess username and pick a recent public game, so you can start from the game you just played. If you don't have one handy, the sample game is one tap.
What will I actually see?
You see the board, an eval bar, every move with a badge, and a note with the move you played beside the move Stockfish prefers, so you can tell them apart. Arrow keys step through the game, and you can try a different move from any position.
Is the analysis any good?
It is Stockfish in your browser. A fast pass walks the whole game so you can see the mistakes quickly, then the position you are on is searched more deeply, so the line can improve after that first pass. A short search can miss a quiet mistake a longer one would catch.
What does signing up give me?
You keep the game you were analyzing, because this page would otherwise forget it. You also get the training chamber on this device, with drills, your saved games, and a scan of your recent public games, so you can work on the pattern instead of one position. No password. Your email and a 6-digit code are enough. A free library stays on this device.
Will you spam me?
No. The only email we send is the 6-digit code you asked for, because that is how you sign in without a password. A new account can also get a welcome note, and later notes, inside the app when those notes are turned on. Those stay in your account, so your inbox is limited to the code you requested.