Stockfish.js 19.0.1 Lite
Chess engine. GPL-3.0 license.
Source code License textLicenses
and sources
This site uses open-source software, models, and visual assets. Their authors, sources, and licenses are listed below.
Position analysis
Maia 3
Human move model and Maia platform frontend move encoding table. GPL-3.0 license.
Source code License textLichess rated database
Opening move statistics for January 2013. CC0 license.
Data sourceInterface
Chess pieces and board
chess.com-boards-and-pieces asset pack, MIT.
Source codeChess.com move sounds
Move, capture, check, castling, promotion, and game-end sounds play from Chess.com's CDN. The files are not bundled with this site.
Sound sourceFallback Lichess SFX sounds
If the CDN is unavailable, open Move, Capture, and Check sounds are used. By Enigmahack, AGPLv3+.
Sound files Terms of useInter
Primary interface font, SIL Open Font License 1.1.
Source code License textDruk Cyr
Font used with permission from the site owner.
Heroicons
Interface icons, MIT.
Source code License textLibraries
@scoriiu/fenshot
Chessboard recognition, MIT.
Source codeonnxruntime-web
Running the Maia model in the browser, MIT.
Source codechess.js
Chess rules and move recording, BSD-2-Clause.
Source codeMotion
Interface animations, MIT.
Project site