GameLens Tools
Free chess tools
No signup, no limits, everything runs in your browser. Pick a tool — every one feeds straight into a full free game review.
Chess Accuracy Calculator
Get your real accuracy percentage from any game — computed by a real Stockfish engine, not an estimate.
Blunder Checker
Paste any game and see every blunder flagged with a plain-English explanation of what it let your opponent do.
PGN Viewer & Opening Detector
Paste a PGN to see its moves, detect the opening (ECO), and jump into a full review when you're ready.