Import your games, find your blunders, master 20 openings, and solve thousands of puzzles — all free, in your browser.
No credit card. No download. Works on any device.
ChessLens combines analysis, opening training, and tactics practice in one clean interface.
Import any PGN. See every blunder, mistake, and missed opportunity with Stockfish 18.
Learn Italian, Sicilian, French, Queen's Gambit and more — with guided walkthroughs.
Sharpen your tactics with rated puzzles matched to your skill level.
Play against Stockfish, challenge friends, or explore any position.
From sign-up to your first improvement — in about 2 minutes.
Sign up with email or Google in seconds. No credit card, no download. Your progress syncs across every device you log in from.
Paste a PGN from Chess.com or Lichess — we'll fetch and analyze it instantly. Or play a live game against Stockfish to generate fresh material to study.
Stockfish evaluates each move. Blunders, mistakes, inaccuracies — all highlighted on the board with the engine's suggested improvements so you see exactly what to play instead.
Pick from 20 curated openings. Walkthrough mode shows you the key moves, ideas, and plans move by move — then challenges you with 10 targeted puzzles to lock in the pattern.
Solve rated puzzles that adapt to your level. Track your rating, current streak, and best streak — the same stats-based approach used by Chess.com and Lichess.
Join ChessLens and start analyzing today.
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