Open-source notices
CloudChess source
CloudChess application source and original artwork are available under GPL-3.0-or-later. Existing third-party licenses remain applicable. The matching source release includes the native engine integration, neural network, required resources and build instructions.
Stockfish
CloudChess uses Stockfish and its neural-network evaluation data. Stockfish is copyright the Stockfish developers and is licensed under the GNU General Public License, version 3. The bundled license is available below. CloudChess uses a native bridge and separately compiled baseline and dot-product engine variants.
Opening and puzzle data
The opening book uses the Lichess chess-openings project and public Lichess game data released under CC0. Source information and the CC0 text are bundled with the app. CloudChess is not affiliated with or endorsed by Chess.com or Lichess.