Chess.com Local Eval (Stockfish) by CTP

Chess dot com local eval provides private, on-device post-game analysis for completed Chess.com games in Firefox.

Features:

• Bundled Stockfish WebAssembly engine—no cloud analysis
• Evaluation graph and evaluation score bar
• Best move and principal variation
• Blunder, mistake, inaccuracy, good, and conservative brilliant labels
• Move navigation and board synchronization
• Board arrows, highlights, and move-quality icons
• Selectable Stockfish depth from 8 through 18
• No account, analytics, telemetry, remote API, or paid Chess.com endpoint

For fair play, engine analysis is unavailable while a game is live or in progress. Review becomes available only after the page exposes a definitive game result or the completed game is opened in Chess.com’s analysis view.

All calculations happen locally on the user’s device. Game moves and analysis results are not transmitted anywhere.

Chess dot com local eval is an independent, unofficial project. It is not affiliated with, endorsed by, or sponsored by Chess.com. Chess.com is a trademark of its respective owner.