# Go Clock Pro — Byo-yomi clock. Built for go.

> Byo-yomi clock. Built for go. (iPhone/iPad app by Wei Zhi Qin.)

- Source: https://appshunter.io/ios/app/go-clock-pro/id6764790687 (this page in markdown: same URL + `.md`)
- Developer: [Wei Zhi Qin](https://appshunter.io/developer/1819440473)
- Category: Utilities, Games
- Price: $1.99
- Age rating: 4+
- Requires: iOS 16.0 · 4 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-04-30
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/go-clock-pro/id6764790687/reviews.md

## What is Go Clock Pro?

Go Clock Pro is a focused game clock for over-the-board go. Place the device beside the board, pick a preset, and start a 9x9, 13x13, or 19x19 game in seconds. No setup maze, no ads, no tracking.

WHY GO CLOCK PRO

- All four go time systems: Japanese byo-yomi, Canadian byo-yomi, Fischer increment, and Absolute.
- Asymmetric time controls for handicap and teaching games. Black and white can use different settings.
- Multilingual countdown in Chinese, English, Japanese, and Korean, with beep and haptic fallbacks.
- Two-sided table layout. Each player reads their own clock from their side of the board.
- Mistake-proof controls. Reset and resign require a deliberate long press.
- Tournament Lock keeps appearance and voice settings stable during a match.
- Offline by design. No accounts, no ads, no tracking, and no network requests.

WHAT YOU GET

- Built-in presets covering common East Asian byo-yomi, Korea 40s, Western Canadian, and Europe Fischer formats
- Custom games with full asymmetric time control
- Resume the last game after the app is closed
- Four visual themes: Kaya, Slate, Washi, and Tournament
- VoiceOver, Larger Text, Reduce Motion, high contrast, and color-independent cues
- Built for iPhone. iOS 16 and later.

PRICING

Go Clock Pro is a one-time $1.99 purchase. No subscription. No in-app purchases. No ads.

FOREGROUND USE

Go Clock Pro is designed for foreground table use. iOS limits background timers and audio to specific app categories, and game clocks are not one of them. When the app enters background or the screen locks, the game pauses and saves a snapshot. Resume requires you to come back and tap. This is a deliberate trade-off for accuracy: a snapshot you trust beats a background timer you cannot.

For best results, place the device flat on the table beside the board, keep the screen on, and keep the app in the foreground.

SUPPORT
98stoned.thrifty@icloud.com

PRIVACY POLICY
https://kaiqin04.github.io/goclockpro/privacy/


## Version history (last 3 releases)

### 1.0.2 — 2026-07-16

Improves game persistence, Canadian byo-yomi stone correction, overtime announcements, audio behavior, and overall clock reliability.

### 1.0.1 — 2026-07-16

Version 1.0.1

Fixes and improvements:
- Removed an unavailable undo control.
- Improved countdown accuracy during timer delays and byo-yomi transitions.
- Fixed timeout alerts and clock-switch countdown announcements.
- Added Voice, Beep, and Silent audio modes.
- Improved localization and VoiceOver labels.

No changes to accounts, ads, tracking, or data collection.

### 1.0 — 2026-04-30

No release notes.

## More apps by Wei Zhi Qin

- [Good Choice: Life Scorebook](https://appshunter.io/ios/app/good-choice-life-scorebook/id6747880424)
- [GoReview](https://appshunter.io/ios/app/goreview/id6760729936)

All apps by Wei Zhi Qin: https://appshunter.io/developer/1819440473

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*