Play · Review · Train
See what your moves actually cost
Analyse your chess games from chess.com or lichess, or paste any PGN. Stockfish runs in your browser — nothing is ever uploaded.
Free, and staying that way
Every feature is free. There is nothing to buy.
Stockfish runs on your own processor, so grading a game costs nothing to serve however many you grade. If it has been useful, you can put something in the tin — and it unlocks nothing.