Click any piece on Chess.com or Lichess and see every legal move it can make, ranked and color-coded by Stockfish 18, built to help you understand chess, not just play it.
Also works in Microsoft Edge. Edge can install extensions directly from the Chrome Web Store.
Most tools hand you a single "best move" and leave the rest unexplained. StockFishy annotates the whole position, piece by piece.
Click any piece to reveal all of its legal moves at once, each ranked and color-coded on a six-step scale from Best down to Blunder, the same vocabulary used on Chess.com and Lichess.
Before you click anything, every piece that can move is marked with a quiet ring and its own rating badge, and the three strongest moves on the whole board are drawn as arrows.
A dashed arrow shows the response Stockfish expects from your opponent after the top move, a small look ahead, not just a single ply.
Toggle it on and the position re-analyzes itself after every move, yours and your opponent's, with nothing left to click.
Stockfish 18 is compiled to WebAssembly and runs entirely inside your browser. No position, no move, no game is ever sent to a server.
Alt+A (Option+A on a Mac) triggers analysis without reaching for the mouse, useful mid-game on either site.
Every move is classified relative to the position's best option, so a glance at the color tells you as much as the number.
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