Built on open source.

The Quiet Board uses these locally hosted libraries. No account or cloud AI service is needed to play.

Stockfish.js 19.0.0

Stockfish.js © 2026 Chess.com, LLC. Based on Stockfish by Tord Romstad, Marco Costalba, Joona Kiiski, Gary Linscott, and other contributors. Distributed under the GNU General Public License, version 3. The engine files are the unmodified lite single-threaded build from the stockfish npm package.

GNU GPL v3 license · Download corresponding engine source, build scripts, and network data · Exact upstream revision

Three.js 0.186.0

© 2010–2026 Three.js authors. MIT license.

License and copyright notice · Project

chess.js 1.4.0

© Jeff Hlywa and contributors. BSD-2-Clause license.

License and copyright notice · Project

This game

The board design, procedural pieces, and application code are provided under GNU GPL v3. This software is provided without warranty. Library copyright notices and their original licenses remain applicable.

Download game source and build instructions · Engine source / build notes

Keep the licenses and source downloads available when redistributing or hosting this game.