Disclosure: this site is made by the ChessHelper team, and ChessHelper (chesshelper.ai) is our own product. We rank it first for learning and analysis and say where other extensions do better. How we handle this.
BestChessExtension

Credits

This site uses openly licensed photos and chess graphics. Thank you to their authors. The site itself is made by the team behind ChessHelper (chesshelper.ai).

Photos

PhotoAuthorLicense
Schachbrett -- 2021 -- 9676 (home, guides)Dietmar RabichCC BY-SA 4.0
Battle field with chess board (safety guide)Carlos ValenzuelaCC BY-SA 4.0
Canada Water Chess Club 5 (fair-play guide)Barney Moss from London, UKCC BY 2.0

All photos come from Wikimedia Commons. They were resized and converted to WebP for this site; no other changes were made.

Chess pieces

Board diagrams use the cburnett piece set by Colin M.L. Burnett, licensed under the GNU GPL v2 or later. The site icon is the cburnett white knight on a blue tile.

Analysis tools used for checking

Chess lines on this site were checked with Stockfish (GPLv3; source code) and chess.js (BSD license). Neither runs on this website; they were used while writing.

Trademarks

Chrome and Chrome Web Store are trademarks of Google LLC. Chess.com, Lichess and the extension names mentioned belong to their owners. Extension icons on our cards are simple placeholders, not the developers' logos.