Free chess tools

Chess Wrapped

See your 2026 in chess: games played, rating peak, favourite openings, your rival and your best streak. Free for Chess.com and Lichess, no signup.

Time control calculator

Is 10+0 rapid or blitz? Type any clock and see what Chess.com, Lichess and FIDE call it, with the rule each one uses. Free, no signup.

Win probability calculator

Your chances against someone 200 points higher: win, draw and loss rates from millions of real Lichess games, by rating and time control.

PGN viewer

Paste a PGN from Chess.com, Lichess or anywhere and replay the game move by move, comments included. Free, no signup, nothing uploaded.

Blunder check

Paste a game or a position and check any move with Stockfish. Coach Bjorn explains the tactic behind a mistake. Free, no signup.

Accuracy checker

Paste a PGN and Stockfish grades every move: accuracy for both sides, every blunder and mistake, and Coach Bjorn on yours. Free, no signup.

Opening stats

Type your Chess.com or Lichess username and see which openings you win and lose with, as White and as Black. Free, no signup.

Diagram maker

Set up any chess position and download it as an image in four board colors, or copy its FEN. Free, no signup, made in your browser.

Cheater check

Check your last 500 Chess.com or Lichess games for opponents later banned for cheating, and see how many of your losses came down to the board.