Yijie Go
Offline KataGo · 20k to 9d+
Free · In‑App Purchases
Yijie Go is a fully offline Go app. The KataGo engine runs directly on your iPhone or iPad — no network, no game records uploaded, and you can start a game with the connection off.
FROM 20 KYU TO 9 DAN+
· The kyu levels are not a weakened engine. They use a network trained on human games — it misses things, gets greedy and plays a loose endgame, like a person rather than a machine playing badly on purpose
· The dan levels are set by KataGo's search depth, one rung at a time
· 9x9, 13x13 and 19x19, with handicap
13,934 LIFE-AND-DEATH PROBLEMS
Life and death, capture, tesuji and endgame, graded by type and five difficulty levels, all solvable offline.
33 BEGINNER LESSONS
Ordered after the British Go Association's teaching guide: capturing first, boards up to 9x9 to begin with, ko last. The graduation test is beating KataGo on 9x9 with a 4-stone handicap.
REVIEW AND RANK ASSESSMENT
Let KataGo analyse a finished game move by move: it draws the win-rate curve and picks out the moves that cost you most. The rank assessment estimates your strength from move quality, not from the result.
TUNED FOR APPLE SILICON
· Prefers the Neural Engine — same strength, less battery
· Low power / normal / full speed, with automatic downgrade when the device heats up
· SGF import and export; games sync across your devices through iCloud
PRIVACY
No account or sign-in, and your games are never uploaded — play and analysis run entirely on your device.
To keep tuning performance across devices, the app reports runtime data while an AI model is running: device model, OS version, memory and CPU use, thermal state and battery level. No game records, no account, nothing that identifies you personally.
— Membership & Subscription —
· Yearly Membership: auto-renewable subscription, 1 year; price shown in-app for your storefront (CNY 38/year in China). Cancel anytime in your App Store account settings.
· Lifetime Membership: one-time purchase, not a subscription.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://tommyeth.github.io/yijie-weiqi/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
· Much smaller download: AI models and the problem library are now downloaded on demand — fetch once, use offline
· New strongest engine b40-zhizi; choose freely among three AI models
· Added kyu opponents from 20k to 2d, driven by a network trained on human games — they play like people, not random bots
· New board skins: beech, rosewood and walnut (membership perk)
· Upgraded learning rewards: 1 day of membership for signing up, 1 more day per 2 chapters completed, and 1 month for finishing all 8
· Gift and paid membership time now stack instead of overlapping
· Bigger edge-to-edge boards in games and problems
· Interface available in Simplified/Traditional Chinese, English, Japanese, Korean and Thai
· Improved board scanning and game-record import, plus various UI and stability fixes
The developer, Suzhou Vector16 Tech Ltd, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Suzhou Vector Sixteen Information Technology Co., Ltd.
- Size
- 11.2 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later.
- iPhone
- Languages
English and 5 more
- English, Japanese, Korean, Simplified Chinese, Thai, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Yearly Member $4.99
- Lifetime Member $7.99
- Copyright
- © 2026 Suzhou Vector Sixteen Information Technology Co., Ltd.