Chess Acuity
Sigfus Bjarnason Games iPhoneiPadiPod touch
Chess Acuity is a free Games app for iPhone and iPad by Sigfus Bjarnason. Requires iOS 16.4. Updated July 25, 2026.
- Price
- Free
- on the App Store
- Size
- 135 MB
- Age 4+
- Updated
- Jul 25
- 2026 · v1.0.1
Screenshots
About Chess Acuity
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.
What’s new
Version 1.0.1 · Updated July 25, 2026
Chess Acuity 1.0.1 is a reliability update that makes on-device analysis feel faster and more dependable. • Stockfish progress and results now reach the screen much faster. • Added a Cancel button while analysis is running. • Fixed imports containing multiple PGN games. • Improved recovery when photo recognition, settings storage, or shared-image imports encounter a temporary problem. • Updated open-source, licence, and privacy information.
App privacy
The developer, Sigfus Bjarnason, reported these privacy practices to Apple.
Data Not Collected
The developer does not collect any data from this app.
Alternatives to Chess Acuity
Looking for apps like Chess Acuity? Here are 6 similar apps on the App Store. The highest rated is Chess Premium+ (5.0/5), and all 6 are free to download.
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Chaal: Chess Position Analyzer
-
Chessight
-
Chess Premium+
5.0
-
Mouseslip: Chess Game Analysis
-
Chess Coach: Learn & Play
5.0
-
PGN Chess Recorder
5.0
| App | Rating | Price | Last updated |
|---|---|---|---|
| Chess Acuity | – | Free | July 25, 2026 |
| Chaal: Chess Position Analyzer | – | Free | Sep 24, 2026 |
| Chessight | – | Free | May 12, 2026 |
| Chess Premium+ | 5.0 / 5 (1) | Free | Jul 13, 2026 |
| Mouseslip: Chess Game Analysis | – | Free | Aug 30, 2026 |
| Chess Coach: Learn & Play | 5.0 / 5 (1) | Free | Sep 25, 2026 |
| PGN Chess Recorder | 5.0 / 5 (6) | Free | Jul 29, 2026 |