JabberChess is the first speech-activated mobile chess application that allows users to play chess with...

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JabberChess is the first speech-activated mobile chess application that allows users to play chess with voice commands. Users can talk to the app to start a new game (as black or white), play moves or request the location of the pieces on the chessboard. This makes it the first chess application that is truly accessible to visually impaired users. The speech commands use the standard chess algebraic notation to make moves on the chessboard. The app's voice and speech recognition functionalities use software packages from Nuance Communications, a world-leading company in speech recognition technologies. JabberChess is built on top of the open-source Stockfish chess program and engine, one of the strongest chess engines in the world. In other words, visually impaired users can now play chess games against the world’s strongest chess engine on their mobile phones.

With the generosity of Nuance Communications, JabberChess is free to all visually impaired users. I hope to use this first release to gather feedback so that I can improve the application in my future releases. Please, send your valuable feedback to [email protected]


1. Start JabberChess App Using Voice Command

To start JabberChess, you can say “Start JabberChess” to Siri. Users can also click on the app icon to start it.

2. Talk to JabberChess

JabberChess shows Stockfish’s screen layout. It has a chessboard displayed on the upper two thirds of the screen and a chess notation area below the chessboard, which takes the remaining one third of the screen, except for a narrow menu bar at the very bottom of the screen. To talk to JabberChess, you need to activate its speech recognizer by swiping anywhere in the chess notation area. You can swipe either from left to right or right to left. Afterwards, you should hear the app say "Listening", indicating for you to state your command. After you finish speaking, the app should say "Done listening”. Otherwise, the app did not detect the end of your speech and will eventually time out. Once JabberChess detects the end of your speech and is able to understand it, it will execute your command. Otherwise, it will respond with “Invalid command”.

The term “successful swipe” will henceforth indicate a swipe in the chess notation area (the bottom one third of the screen) that the app successfully detects and responds with "Listening".

Remember to wait for JabberChess to complete its speech before swiping again.

3. Start A Game Using Voice

If you want to start a game as white player, you need to say “Start game with white” after a successful swipe. After the game starts, JabberChess should say “Game ready”. That means a new game started, where you are the white player and the chess engine is the black player. If you want to start a game as the black player, you should tell the app “Start game with black” instead. If you start a game as the black player, you need to wait for the white player (the engine) to make a move, which JabberChess will announce. Then, make a successful swipe and respond with your move.

4. Tell JabberChess to Make A Move

In order to make a move, do a successful swipe and then state your move using chess algebraic notation. For example, you can say “e4”. The app should move the pawn to square e4. If JabberChess detects an invalid move, it will respond with “Invalid move”. It would tell you “Invalid command” if it did not understand what you said.

5. Ask JabberChess for Pieces and Their Positions on the Chessboard

If you need to know where the pieces are on the chessboard, you can ask JabberChess to show the current pieces and their positions by saying “Show Position” after a successful swipe. It should start saying each piece currently on the chessboard, its color and its position in algebraic coordinates.

6. Stockfish in JabberChess

JabberChess contains all of the Stockfish features for click and touch actions.

7. See app website for details and known issues.


Get it (41.0 MB) on app store


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