This page follows the GNU JavaScript License Web Labels convention (https://www.gnu.org/licenses/javascript-labels.html). The free-software JavaScript and WebAssembly served by flexichess.com is listed below with its license and corresponding source. The application's own bundled scripts are first-party proprietary code and are not listed as free software.
| stockfish.js | GPL-3.0-or-later | stockfish.js v18.0.0 release (corresponding source) |
| stockfish.wasm | GPL-3.0-or-later | stockfish.js v18.0.0 release (corresponding source) |
Full attribution for every component, and a standing written offer of corresponding source, lives at flexichess.com/credits.