Blunder Review by Blunder Review

Blunder Review gives you a proper Stockfish review of your chess games — free, ten games a day.

This extension is the shortest path to it. Finish a game on Chess.com or Lichess, click the toolbar button, and the game opens in Blunder Review with the engine already working: every inaccuracy, mistake and blunder labelled with what it actually cost, a what-if board for exploring the lines you didn't play, and hint arrows built from your own history.

Connect your account and Blunder Review also finds your leaks — the positions you keep reaching and keep getting wrong across your whole game history, which a single game review can never see.

The extension itself is deliberately minimal. It does nothing until clicked, reads only the address of the current tab to recognise a finished game, and sends nothing anywhere until you choose to review. No analytics, no tracking, no browsing history.

Free to use. Paid plans add deeper server-side analysis and more daily reviews.