See The Mate is a free chess analysis tool that runs the Stockfish 18 engine directly in your browser. Paste a game from chess.com or Lichess, or search by username, and get instant move-by-move evaluation, blunder detection, and opening identification — with no account, no paywall, and no daily limit.
Yes. Every feature — full-depth Stockfish analysis, move classification, the evaluation graph, and unlimited puzzles — is free with no daily cap. There is no premium tier and nothing is locked behind a subscription.
Chess.com limits free accounts to one game review per day and reserves full-depth analysis for Diamond members. See The Mate runs Stockfish 18 locally in your browser, so there is no server cost and therefore no limit — you can review as many games as you want at full engine depth.
No. You can search chess.com or Lichess by username, or paste a PGN or Lichess game URL directly, and start analysing immediately.
No. The Stockfish engine runs as WebAssembly inside your own browser tab. Your moves and positions are evaluated on your device and are never uploaded anywhere.
Each move is graded by comparing it to Stockfish’s best move at that position and measuring the centipawn loss — the drop in evaluation caused by your move. Small or zero loss earns Best, Excellent, or Brilliant; large loss is flagged as a Mistake or Blunder, the same scale used by chess.com and Lichess.