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Credits

Last updated: September 13, 2026

Engines

• Stockfish — GPL v3. We ship a modified WebAssembly build; its source: github.com/chessceo/stockfish.
• Leela Chess Zero — GPL v3, lczero.org.

Piece sets

Alpha	Eric Bentzen	Commercial licence
cburnett	Colin M.L. Burnett	GPL v2+
Executive, Executive 2, Football, Letter, Shapes, Blindfold, Checkers	Chess.ceo	Proprietary

Software

• Lucide icons (ISC), Phosphor icons (MIT), Dockview (MIT), fflate (MIT), Noto Sans Symbols 2 (OFL 1.1).

Chess.com, Lichess and FIDE names and logos belong to their owners and only mark links to those sites.