Chessight vs Chess Acuity

Chessight is the fastest way to analyze, review, and learn from your chess games — all on your iPhone. Import your own games or analyze chess.com matches from any username. A full Stockfish 18 engine runs locally on your device to classify every move as brilliant, great, best, inaccuracy, mistake, or blunder — exactly like the big chess sites, but without an account or monthly subscription. WHAT YOU CAN DO • Analyze any PGN — paste a game or import via share sheet • Pull chess.com games by username with one tap • See move-by-move accuracy, classifications, and eval graph • Tap any move for a detailed breakdown with best alternatives • Explore variations freely — play "what if" lines and get instant evaluation • Share positions with a single tap PLAY & TRAIN • Play against Stockfish at adjustable depth (1–20) • Solve the daily chess.com puzzle • Browse 37+ famous checkmate patterns • Edit any position with a flexible board editor PRIVACY FIRST • The Stockfish engine runs entirely on your device — your games never leave your phone • No account required • Chess.com game data fetched through their public API FREE OR PREMIUM • One free deep analysis every day • Watch a short ad to unlock additional analyses • Or buy Premium once — unlimited analyses, no ads, forever • Premium is Family Shareable WHAT'S INCLUDED • Stockfish 18 with NNUE neural evaluation • Interactive board with legal-move highlighting • Opening book detection • Accuracy stats across games • iPad-optimized two-column layout • Works on iPhone and iPad (portrait and landscape) Download Chessight today and start analyzing every move you make.

Chess Acuity turns any chess position into insight — entirely on your device. Set up a position and Stockfish 17, running locally on your iPhone, shows you the best moves and lines. No account, no ads, no analytics, no internet connection required. The app is free and open source. FOUR WAYS IN • From a photo — share a screenshot from any chess app or website, or pick one from your photo library. A built-in recognizer reads the board on-device and sets up the position. • From a game — paste a PGN, step through the moves, and analyse any position along the way. • By hand — set up the board in a clean, fast editor. • By FEN — paste a position directly. ANALYSIS • Powered by the Stockfish 17 chess engine, running natively on your device. • Multiple lines (MultiPV) with evaluations, searched by depth or thinking time. • Step through any line move by move on the board. • Plain-language explanation of the engine's choice. PLAY • Play a full game against Stockfish at eight strength levels. • Take a hint when you're stuck, then hand the finished game straight to the analyser. PRIVATE BY DESIGN Everything — board recognition, engine analysis, move explanations — runs on your device. The app makes no network requests and collects no data. Screenshots you import are processed locally and never uploaded. OPEN SOURCE Chess Acuity is free software under the GNU GPLv3. The complete source code is available at github.com/alexostar/chess-acuity-app. FAIR PLAY Chess Acuity is made for study and review. Please don't use it for assistance during live or rated games — that breaks the fair-play rules of every chess site and spoils the game for everyone.