SakataGo

Play Go offline with KataGo!

$8.99 · Designed for iPad

KataGo for iOS - completely offline - anywhere, anytime! SakataGo – Play Go offline with KataGo Bring one of the world’s strongest Go AI engines, KataGo, directly to your iPhone or iPad — fully offline, no internet or servers required. Play, analyze, and improve your Go game anywhere, against AI opponents ranging from advanced beginner to professional and superhuman levels. Key Highlights: - Fully offline KataGo AI – play anywhere, anytime! - Adjustable AI strength: from 10‑kyu to full KataGo strength - Realistic board and stones: Hyuga Kaya boards with slate and clam shell stones - Game analysis and hints: review moves, estimate territory, and check win rates - SGF support: open, share, and store Go game files easily Please note: The hardware of the iPad 7th generation from 2019/2020 (A10 Fusion chip) is not compatible with the human imitation modes in SakataGo. The app will have a weaker performance on these old devices. Play & Learn SakataGo combines the KataGo engine with powerful analysis tools: - Step through games forward and backward, get AI hints, and see territory and win rate estimates - See color indications for move quality when reviewing games (green, yellow, orange, red, and purple according to point loss) - Store up to twenty positions in a review stack and cycle through them - Continue playing from any review position, keeping the reviewed game stored or in the clipboard - Choose between human imitation levels (10‑kyu to 9‑dan amateur) or full KataGo strength, based on current neural network models (2025/2026) - Switch opponent strength, AI player and think times during a game to test different reactions User Settings: - AI Player (white, black, or none) - Board size (9 x 9, 13 x 13, 19 x 19) - Handicap and Komi adjustments - Choice of Japanese or Chinese rules - AI think time and hint calculation time - Optional on-screen win rate and score display - Select between two KataGo neural net models (small and large) - Switch sound on or off Realistic Design - Enjoy a beautiful, natural board and stone setup, with slight imperfections for a realistic feel. - SakataGo’s easy-to-use interface focuses on essentials so you can focus on playing and improving your game. Game Sharing & SGF Support - Open SGF files from the Files app, from the clipboard or via Share Extension - Share games or positions via clipboard or compatible apps, or save to file - Note: variants in SGF files are not supported; SakataGo’s main focus is offline AI gameplay and review. However, by using SakataGo's review stack and clipboard functionalities, you can easily play out variants and return to former positions. Why "SakataGo"? The app name was chosen both in honor of Eio Sakata (坂田 栄男, 1920-2010) and KataGo (*2019), combining the names of one of the leading professionals of the 20th century with today's leading Go playing AI.

  • 5.0
    out of 5
    1 Ratings

- We improved the SGF reading capabilities to handle SGF files from kifu photo apps and SGF files with pre-set positions. - We improved the compatibility of the app with iPad (7th generation) models from 2019/2020 running on iPadOS 18. We noticed after a bug report that the GPU of these devices cannot properly handle some features of SakataGo. A new "small model" was added which has much better performance on these devices. However, we also had to switch off the human imitation modes, as they cannot be operated reliably on the old hardware. - Fixed a bug in the handling of imported SGF files leading to incorrect move quality indications in certain cases.

The developer, Torsten Hefer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    • Torsten Hefer
    Size
    • 571.5 MB
    Category
    • Board
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • iPad
      Requires iPadOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 2 more
    • English, Japanese, Korean
    Age Rating
    4+
    Copyright
    • © 2025 Torsten Hefer