Download, documentation, technical details, and frequent questions. One of the strongest chess engines in the world. Winner of the Top Chess Engine Championship and Chess.com Computer Chess Championship, and consistently ranks highly on rating lists.

Download Stockfish for Windows, Android, MacOS, iOS or Linux.

Play against Stockfish: learn with the best chess engine. Stockfish is one of the best chess engines avaliable. And with the help of WebAssembly the engine can now also be executed online in the browser.

Stockfish is the strongest chess engine available to the public and has been for a considerable amount of time. It is a free open-source engine that is currently developed by an entire community. Stockfish was based on a chess engine created by Tord Romstad in 2004 that was developed further by Marco Costalba in 2008.

Stockfish is a free and open-source chess engine, available for various desktop and mobile platforms. It can be used in chess software through the Universal Chess Interface.

Stockfish is a free and strong UCI chess engine derived from Glaurung 2.1 that analyzes chess positions and computes the optimal moves. Stockfish does not include a graphical user interface (GUI) that is required to display a chessboard and to make it easy to input moves.

Mar 30, 2025 · The Stockfish project builds on a thriving community of enthusiasts (thanks everybody!) who contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong.