ChessOnyx turns your own games into your best training material.

Import your games from Chess.com and Lichess, run them through Stockfish 18, and see exactly where each game turned — not just that a move was bad, but which idea you missed and what the position really demanded.

ANALYZE YOUR GAMES
• Full Stockfish 18 analysis, running right on your device
• Every move classified: marvelous, flawless, polished, solid, inaccuracy, mistake, blunder
• Evaluation graph, best lines, and the tactical motif behind each turning point
• Automatic import from Chess.com and Lichess, or paste any PGN

TRAIN WITH PUZZLES
• Over 3 million puzzles, rated and sorted by theme
• Unlimited practice in random mode, plus rated puzzles that move your rating
• Tactical theme statistics that show which motifs you keep missing

STUDY OPENINGS
• Opening explorer backed by a master game database
• Detailed pages on the main openings, from the Italian to the Sicilian
• Move explanations, key variations, and an interactive board
• Take any line straight to the board and play it against the engine

PLAY AGAINST THE ENGINE
• Play at the strength you choose, from beginner to full engine
• Pick an opening for the bot to play, and drill the line until it is routine
• Send the finished game to analysis in one tap

TRACK YOUR PROGRESS
• Rating history, accuracy trends, and per-phase performance
• See whether you lose games in the opening, the middlegame, or the endgame
• Peak rating, best streak and accuracy records, kept across every mode

BUILT FOR EVERYONE
ChessOnyx is free to use, with a Pro tier for players who want more. High-quality analysis should not sit behind a steep subscription, so the core is open to all players — from beginners learning why a move loses material to club players hunting down a recurring weakness.

Available in 16 languages.

Subscriptions are managed on chessonyx.com.