Chess Acuity vs Chessigma

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.

Chessigma reviews your chess games, shows you where the points went, and turns your own mistakes into training. The app has five tabs: Home, Train, Coach, Games and Brain. FREE - Game review: import your games from Chess.com or Lichess by username, or paste a PGN or a game link. Every move is graded, the turning points are marked, and you see the better move and the evaluation graph. The Stockfish engine runs on your phone, so a review needs no account. - Puzzles: a daily puzzle to keep your streak, classic puzzles, and Woodpecker sets that repeat the same positions until the patterns stick. - Opening Trainer: learn opening courses line by line. The first lines of every course are free. - Brain Games: twelve short games with scores and leaderboards. Nine are built on chess, and three need no chess: a reaction time test, Queens and Memory Match. - Sparring: play the first bots on the sparring ladder. - A first look at your coach report, built from your recent online games. - One move explanation from the coach each day when you are signed in. Signing in is free and keeps your streak, puzzle rating, scores and progress on every device. SUPERCOACH Supercoach is the paid plan. It adds: - Coach chat: ask the AI coach about your games, your openings and your habits. - Your full player report in six chapters (Overview, Blunders, Clock, Tactics, Conversion, Openings), with a heatmap of your blind spots. - A daily plan of coached tasks picked from your own games. - Move explanations in every game review, and the option to play on from any position. - Blunder Shield and Blunder Training: drills built from the positions where you blundered. - Conversion Trainer: practice winning the games you were winning. - Every rival on the sparring ladder and every line of every opening course. Coach messages come from a monthly allowance. Coach answers are written by an AI model through a third-party service, and every answer has a Report button. ACCOUNT Sign in with Apple, Google or your email address (we send a 6-digit code, no password). If your Chessigma account already has Supercoach, it works in the app as soon as you sign in. You can delete your account in Account > Delete account. SUBSCRIPTION Supercoach is an auto-renewing subscription, monthly or yearly. The price and billing period are shown in the app before you buy. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period, and the renewal is charged within the 24 hours before the period ends. You can manage or cancel it in your App Store account settings. Terms of Use: https://www.chessigma.com/tos Privacy Policy: https://www.chessigma.com/privacy-policy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/