Stockfish is a powerful chess analysis app. Play two-player games, or get an instant, accurate analysis of any game. Stockfish will tell you who's winning and calculate the best move.
Stockfish has a gorgeous board that looks fantastic on Retina Displays. It's full of nice touches: when you click or drag a piece, its destination squares are highlighted in yellow, and the best move is shown with a red arrow. Plus, you can go full screen for the most immersive chess experience.
The analysis is powered by the Stockfish chess engine, the strongest free chess engine in the world. You're getting top-notch analysis that surpasses the strongest human chess grandmasters.
Stockfish has many enhancements for advanced users. You can browse through multi-game PGN files, copy and paste FEN strings, utilize Syzygy endgame tablebases, and use MultiPV.
Stockfish is completely free, and the source code is available on our website (stockfishchess.org) under the GPLv3 license.
A Windows version is available on the developer's website. We didn't add it because the Windows version is a command-line app, so you have to select from multiple versions, then download a GUI to use it.