ChessLab vs Chess Trainer

ChessLab is a complete chess companion for iPhone and iPad: play, analyse, train and experiment, with Stockfish built in, without ever leaving the app. OPPONENTS THAT PLAY LIKE HUMANS Nine characters played by Maia-3, a network trained on millions of human games: it does not look for the best move, it plays the one a human of that level would play, blunders included. Each has a style, a repertoire and a temperament, and a level set on the human scale. Or take on Stockfish, from beginner (~900 Elo) to maximum (~3190). Optional clock, hints, a warning before risky moves and an evaluation bar, all on demand. ANALYSE AND UNDERSTAND Every move is graded (inaccuracy, mistake, blunder, brilliant…), each player gets an accuracy score, and the app tells you why a move was bad. The Coach adds the share of players at your level who play it. At the end, it offers to turn your mistakes and missed mates into puzzles. Load a game by PGN, FEN, position editor or photo scanner. DAILY SESSION Every day, what to review: opening positions that are due, missed puzzles, an endgame. A streak of days and medals to keep you going. OPENINGS 58 hand-written openings (bilingual), checked against the engine: every move is explained, coloured arrows tie the board to the move list, and spaced repetition makes them stick. Import your own repertoires as PGN too. ENDGAMES 78 courses proven by endgame tablebases: no move taught gives up a win, no defence offered loses a draw. Plus free training, where any move that keeps the verdict is accepted. PUZZLES Over 100,000 problems from the Lichess database, filtered by level and theme, plus your own, drawn from your mistakes. Personal rating and “At my level”. VARIANTS AND MORE Chess960 and eleven variants against the computer (King of the Hill, Three-Check, Horde, Atomic, Crazyhouse, Duck Chess, Barricades…), each with its own analysis. Two-player mode, and a Laboratory to compare two Stockfish settings. IPHONE AND IPAD A large board with side-by-side panels on iPad, keyboard and trackpad, portrait and landscape. Fully bilingual, French and English. Optional iCloud sync, off by default. PRIVACY Offline by default: no ChessLab server, no analytics, no ads. Your games stay on your device. ChessLab embeds the Stockfish engine (GPLv3 license), the University of Toronto's Maia-3 network (AGPLv3 license) and free vector piece sets — cburnett (GPLv2+/CC BY-SA), chessnut (Apache 2.0) and merida (GPLv2+). Full source code and license notices are available from within the app (Settings → Licenses).

Chess is not learned from a book — it is learned on the board. Chess Trainer makes you PLAY every idea: every lesson ends with positions you must win yourself, and every pattern becomes a move your hands know. THE ROAD Short lessons you play, not read. Watch each idea arrive move by move, replay it as often as you like, then prove it — three positions where you deliver the mate yourself, and a boss game to seal the unit. CHECKMATE PUZZLES Mate in 1, 2 and 3, every solution engine-verified. Learn the 29 named checkmate patterns — back rank, smothered, Anastasia and the rest — and collect them in the Mate-dex: a card is engraved the first time YOU deliver that mate in a real position. 5,000 RATED PUZZLES From 400 to 2400, by theme: forks, pins, mates, defence, endgames. A puzzle rating that moves after every puzzle, a daily puzzle for your level, and a streak. PLAY • Our own on-device bot: plays anywhere, no internet needed, free forever. • Rated levels from 1350 to 2850 Elo, powered by Stockfish — the world's strongest open-source engine — running on our servers. • Pass & play with a friend on one device. GAME REVIEW Every move graded, from Brilliant to Blunder, with an accuracy score for both sides. See what the engine would have played, step through the game move by move, and keep the review forever — reopening it is free, even offline. Every mistake gets a sentence — what it cost, what it allowed, what was better — and you can retry the move. FAIR BY DESIGN Lessons, every Journey mission and the on-device bot are free. Every day you also get 10 rated puzzles, one Stockfish game and one game review. Coins buy one more; Chess Trainer Pro makes everything unlimited. No ads, ever. No account, no login. 13 languages. Built for iPhone and iPad. Subscription details Chess Trainer Pro is available as a monthly or yearly auto-renewing subscription, or as a one-time lifetime purchase. Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in Settings → Apple ID → Subscriptions. Privacy Policy: https://chesstrainer-web.web.app/privacy/ Terms of Use (EULA): https://chesstrainer-web.web.app/terms/