Stockfish should not need any introduction to chess fans. It is one of the strongest chess engines around. Best of all, it is open source and available as a free download for many platforms. Thanks to these Stockfish iPhone apps, you can play and analyze your games on-the-go:
Arkon: this chess opening explorer for iPhone comes with an offline Stockfish engine. This app simply helps you build a solid opening repertoire with solid analysis. Move popularity information is also provided.
Chessify: an amazing app that lets you scan chess diagrams for analysis on your phone. It has Stockfish in the cloud and even lets you search YouTube videos for positions you are analyzing. You can use this app to follow top chess tournaments and play against the engine.
SmallFish Chess: an open source chess app based on Stockfish. It lets you play against the engine, analyze your games, and learn from the engine. You can control the engine parameters too.
Stockfish Chess: another free Stockfish iPhone app that lets you practice chess anywhere. It has adjustable playing strength and multiple styles of play for you to choose from. You can play against the machine or both sides. The source code is available under the GNU General Public License.
Analyze This Chess: lets you analyze your game with Stockfish. You can set up any position, paste any PGN or FEN and have the games replayed automatically. You have the option to add comments to your games and load games via browser or iTunes.
Have you found better Stockfish apps for smartphones? Please share them here.