Why is it free?
There is no server to pay for. Stockfish runs inside your browser, so an analysis costs nothing to run, and there is no queue and no daily limit.
Free chess analysis
of your own games.
The public name you play under on Lichess or Chess.com. No account, no password, nothing uploaded — the engine runs here in your browser tab.
Game review
Replay one game with a verdict on every move.
Opening galaxy
See every game you played as one map of your openings.
Analysis board
Play out any position beside the moves you played there.
Training plan
Turn your whole record into a week you can print.
Play patterns Beta
Read how another account plays, on a scale from 1 to 100.
A different account, on purpose
Puzzle of the day ·
White to move — one move ends it.
Show the answer
New here
Training plan
Every game you have played, read for what actually costs you points — and turned into a week of training you can print and stick on a wall. It names at most three things to work on, shows the numbers behind each one, and tells you plainly how long your rating goal usually takes. If nothing in your games stands out, it says that too.
Questions people ask before they type a name
Do you store my games?
No. They come straight from the public Lichess and Chess.com records into this tab. Nothing about you reaches a server here, because there is none.
Do I need an account?
There are none. Your name is kept in this browser only, and a different device starts over. That is the price of having no accounts, and it is the reason there is nothing here to leak.
How long does one game take?
Usually under a minute, plus a 7 MB engine download the first time you use it. After that the engine stays in your browser cache.
Is the accuracy the same as Chess.com’s?
No. It counts the win probability you gave away, on a scale of its own, so the two numbers will not match. Where both have been measured, this one came out above Chess.com’s, not below.
Can I analyse older games?
The review lists your twelve most recent games. For everything further back, the opening galaxy reads your whole archive at once.
What is Play patterns for?
It reads how one account plays, its move timing, its consistency between games and the moves themselves, and puts that on a scale from 1 to 100. It is a description, not an accusation, it publishes nothing and it names nobody.
Which engine, under which licence?
Stockfish 17.1 Lite, compiled to WebAssembly and shipped unmodified under the GNU GPL version 3 (source, WebAssembly build). Move generation uses chess.js, opening names come from lichess-org/chess-openings, the piece set is Cburnett under GPL version 2 or later, and the analytics script is Plausible under AGPL version 3.