Chess Lab vs ChessLab

Open the app and your previous channel is right there. Watch world-class games in your spare time. Save interesting matches and analyze the positions. Chess Lab: Arasan Engine is a chess app that combines a world-class chess engine and Lichess spectating into one beautiful, intuitive interface. ▪ Play instantly with "Web Invite" - No download or account creation required for your opponent. - Just send an invite link, and they can join immediately from their smartphone or PC browser. ▪ Diverse game modes - Web Invite Match: Easy private matches via URL. - Offline CPU Match: Play against the powerful Arasan engine (featuring the latest v26.1 / NNUE v8). Practice with 30 levels of adjustable strength. - Local 2-Player Match: Play face-to-face on a single device. ▪ Watch world chess on your smartphone. Lichess Spectating - Watch top world games right in the app, just like watching TV or manga on your phone. - Channel selection (Top Rated / Bullet / Blitz / Rapid / Classical), thumbnail/list display, and item count (10/20/30) support. - Displays board, moves, clock, playback controls, and termination reason. Rewind moves to review. - Your previous tab and channel open automatically, putting world games right in front of you during spare moments. - Save interesting games to history to use for your own learning. ▪ Extensive analysis & replay features - Powered by Arasan: Built-in UCI engine that calculates highly accurate evaluations and best moves. - Real-time Analysis: Displays evaluation bar and eval graph in real-time during games. Recalculate past games with "Analyze Position" and save the graph. The graph uses a dynamic scale that excludes mate scores and clamps at a maximum of ±15 pawns. - Candidate Moves Display: Shows top candidate moves on the board with arrows, ghost pieces, and evaluation labels. The 1st move is blue, and subsequent moves are color-coded green → yellow → red based on Loss (difference from the 1st move). Toggle visibility with the "Candidates" button. - Interactive History: Step playback, fast-forward, jump to any position, and a "Rewind" (back to start) button for efficient review. - Visualized Insights: Automatically highlights large evaluation changes (blunders). Color-codes long-thinking moves (red/yellow) to visualize time management. - PGN Import: Import external game data (PGN). ▪ Premium board experience - 2.5D & 2D Display: Switch between a tilted 2.5D perspective and a classic 2D board. - Piece Design Toggle: Choose between text pieces and detailed image pieces. - Full Promotion Support: Accurately select Queen, Rook, Bishop, or Knight when promoting a pawn. - Pause & Resume: Automatically saves unfinished games so you can resume later. ▪ Improved menu & settings - Redesigned bottom menu into a 3-tab layout: "Match / History / Lichess". The header switches according to the selected tab. - Tab selection state is saved, so the previous tab opens automatically on the next launch.

Completely free, no ads, no account: nothing leaves your device. 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 130,000 problems from the Lichess database, filtered by level and theme, plus your own: drawn from your mistakes, or imported from your own PGN files. 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).