Chee - Live Chess Analysis

Live chess analysis overlay powered by Stockfish WASM

Chee adds a real-time analysis panel to your chess games on Chess.com and Lichess.org. It runs Stockfish (one of the strongest chess engines) entirely in your browser using WebAssembly — no server, no account, no data sent anywhere. Features: • Multi-line analysis — see the top 3-5 best moves and continuations • Adjustable search depth (19-22 ply) • Eval bar showing who's winning at a glance • Arrow overlays on the board for suggested moves • Move classifications — Brilliant, Crazy, Best, Excellent, Good, Inaccuracy, Mistake, Blunder • Crazy sacrifice detection — flags material sacrifices that maintain evaluation • Blunder guard — warns when you click a piece not in any top engine line • Eval score chart — SVG area chart plotting eval over the game • PGN export — copy annotated PGN with eval comments and classification symbols • Accuracy tracker — running accuracy percentage in the status bar • Tactical insights — dashed arrows show the best move after Mistakes and Blunders • Pre-move hints — see the engine's best move or classification-based hint arrows • Opening name display — 850-entry ECO opening database • Copy FEN to clipboard with one click • Draggable panel — drag the header to reposition anywhere, double-click to reset • Resizable panel — drag the bottom-right grip to adjust width • Minimize or hide the panel when you don't need it • Catppuccin theme system — Latte, Frappé, Macchiato, Mocha, or auto-match the site theme Supported sites: • chess.com — live games (/game/*, /play/*) • lichess.org — all game pages All analysis runs locally in your browser. No data is collected or transmitted.