ChessLab

Description

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

Pick an opening and step through it move by move: every move is explained,

the alternatives are offered, and colored arrows link the board to the move

list. 58 hand-written openings (bilingual), with simplified spaced-repetition

training to memorize them.

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.

iCLOUD SYNC (optional)

Turn on iCloud sync in Settings so your games follow you across all your

devices, via your private iCloud. No account to create, no ChessLab server.

Off by default: the app works fully offline.

PRIVACY

Offline by default: no ChessLab server, no analytics, no ads. Your games

and settings stay on your device. iCloud sync, if you enable it, uses your

own private iCloud — your data is never shared with the developer. Fully

bilingual, French and English.

ChessLab embeds the Stockfish engine (GPLv3 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).