The ChesStresS client (the game that runs in your browser or inside the app) is free software under the GNU General Public License, version 3. This page is the offer of its source code, free of charge, to everyone who has the app or uses the website. Kod źródłowy klienta ChesStresS jest dostępny bezpłatnie na tej stronie, na licencji GPLv3.
The client is written in plain HTML, CSS and JavaScript and is not compiled or minified: the files the game runs are the source code. Every file is served at chesstress.com under the name shown below; the apps for iPhone and Android contain the same files, wrapped with Capacitor (MIT licence). Licence text: Copying.txt.
If the list does not load here, open chesstress.com/source.html. You can also ask for the files as one archive, free of charge: [email protected].
The chess engine is Stockfish, GPLv3, by the Stockfish developers, built for the web as Stockfish.js 19 (lite, single-threaded): files stockfish-19-lite-single.js and stockfish-19-lite-single.wasm, unchanged. Source code of that build: github.com/nmrugg/stockfish.js. Source code of Stockfish: github.com/official-stockfish/Stockfish.
The ChesStresS game server is a separate service; it is not distributed and not under the GPL. The name “ChesStresS”, the logo and the visual identity are not licensed under the GPL. The intro music is © Three Border Collies, all rights reserved.