Attributions
Included Assets
Credits for the assets and engine components currently shipped by the website
Chess engine
Stockfish.js 18, based on Stockfish
The bundled browser engine files identify themselves as GPLv3-licensed Stockfish.js 18 builds.
Wrapper source: github.com/nmrugg/stockfish.js
Engine source: github.com/official-stockfish/Stockfish
License: GNU GPL v3
Distributed without warranty, to the extent permitted by applicable law.
Replay encoding
Mediabunny 1.61.5 by Vanilagy · MP4 encoding · MPL-2.0
Unmodified library. Source · Exact distributed version and source package · License
gifenc 1.0.3 by Matt DesLauriers · GIF encoding · MIT
gifenc sourceCopyright (c) 2017 Matt DesLauriers
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Platform logos
Chess.com pawn logo and Lichess logo
Used as source-identification icons in the dashboard and analysis UI, not as this app's own branding.
Chess.com asset source: Official community brand asset pack
Lichess asset source: Wikimedia Commons file page
Lichess license: GNU AGPL v3 or later
Interface icons
Selected UI icons from the Pixelarticons Interface Icons collection by halfmage
This includes several interface glyphs used across the app, including icons such as Dashboard and Close.
Collection: Pixelarticons Interface Icons
Author: halfmage
License: MIT License
Brand and game icons
Favicon and move-classification icon set
Project-owned custom artwork used for the site mark and move quality indicators.
Board sound effects
Board sound pack from jcarolus/android-chess
This app ships the `res/raw` chess sound pack from the Android Chess project and currently uses `move.mp3`, `capture.mp3`, and `illegal.mp3` for board feedback.
Source: github.com/jcarolus/android-chess/tree/master/app/src/main/res/raw
License: MIT License
Illustrated set
Chess Pieces and Board Pack by Joszs
Licensed under Creative Commons Attribution 4.0 International.
Source: joszs.itch.io/chess-pack
License: CC BY 4.0
Minimal set
Project-owned AI-generated chess piece set.
Geometry set
Project-owned AI-generated chess piece set.
Baskervile set
Custom chess piece set by Baskervile, provided for this project.
Cburnett set
Cburnett piece set from Wikimedia Commons
Licensed under Creative Commons Attribution-ShareAlike 3.0.
Source: commons.wikimedia.org
License: CC BY-SA 3.0
Chessnut set
Chessnut piece set by Alexis Luengas
Licensed under Apache License 2.0.
Source: github.com/LexLuengas/chessnut-pieces
License: Apache 2.0
Alfarishy set
Alfarishy piece set by Jordan Alfarishy
Licensed under Creative Commons Attribution 3.0.
Source: thenounproject.com
License: CC BY 3.0
Saakyan set
Saakyan piece set by Sergey Saakyan
Licensed under Creative Commons Attribution 3.0.
Source: thenounproject.com
License: CC BY 3.0
Kosal set
Kosal piece set by Philatype
Licensed under Creative Commons Attribution 4.0 International.
Source: github.com/philatype/kosal
License: CC BY 4.0
Trendy set
Trendy piece set by Benjamin Kinard
Licensed under Creative Commons Attribution 3.0.
Source: thenounproject.com
License: CC BY 3.0
Vecon set
Vecon piece set by vecon
Licensed under Creative Commons Attribution 3.0.
Source: thenounproject.com
License: CC BY 3.0
Notes
Assets not approved for commercial launch are not served by the site
Additional archived piece and board packs were moved out of the public asset path and are kept in the repository under `non-licensed/` for reference only.