ChessLab

ChessLab is a complete chess companion for iPhone and iPad: play, analyze, train and experiment, with the Stockfish engine built in and without ever leaving the app. PLAY VS STOCKFISH Take on Stockfish at any strength you like, from beginner (~900 Elo) to maximum (~3190 Elo), with or without a clock. Hints, a warning before risky moves, and an evaluation bar can all be toggled on demand. TWO PLAYERS Play locally on the same device, with a "pass-and-play" mode that flips the pieces so both players read the board comfortably. ANALYZE Run a game or a position through Stockfish: move-by-move classification (inaccuracy, mistake, blunder, brilliant move…), an evaluation graph, best- move and opponent-threat arrows, and auto-play through the moves. Import by PGN, FEN, position editor, or photo scanner. OPENINGS Browse the complete set of 149 ECO families, tagged by style (classical, hypermodern, system, irregular), pick your side, and drill each line move by move. PUZZLES Over 100,000 tactics puzzles from the Lichess database, filterable by rating and theme, plus puzzles generated automatically from your own mistakes in analysis. Spaced repetition and progress tracking included. LABORATORY Pit two Stockfish configurations against each other over a series of games to compare their strength, with an estimated Elo gap and confidence interval. EDITOR AND SCANNER Set up a position by hand, or scan it from a screenshot or a photo — review and correct the recognized position before playing or analyzing it. BUILT FOR IPAD Full-size board with move list, graph and MultiPV visible at once, keyboard and trackpad support, polished portrait and landscape layouts. PRIVACY 100% local: no account, no server, no analytics, no ads. Your games and settings stay on your device. Fully bilingual, French and English. ChessLab embeds the Stockfish engine (GPLv3 license) and the cburnett vector piece set (CC BY-SA) — full source code and license notices are available from within the app (Settings → Licenses).