# Digital Sun Dial vs True Solar Time （真太陽時）

The clearest difference is price: True Solar Time （真太陽時） at Free against Digital Sun Dial's $1.99. True Solar Time （真太陽時） also leads on iOS requirement (13.0 vs 16.6). Digital Sun Dial's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

True Solar Time （真太陽時） is free to download; Digital Sun Dial costs $1.99 up front. True Solar Time （真太陽時） sells 1 one-off in-app purchase. Digital Sun Dial asks for nothing beyond the download.

Digital Sun Dial ships an update daily, True Solar Time （真太陽時） every 5 days. The most recent releases landed on October 9, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Digital Sun Dial | True Solar Time （真太陽時） |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 5 days |
| Size | 49 MB | 24 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [MICHAEL JOHN HAMILTON](https://appshunter.io/developer/1820670753) | [Tsz Fung Shing](https://appshunter.io/developer/1877613702) |

## What reviewers say

### Digital Sun Dial

[App page](https://appshunter.io/ios/app/digital-sun-dial/id6748704583)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### True Solar Time （真太陽時）

[App page](https://appshunter.io/ios/app/true-solar-time/id6759240543)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 購買移除廣告 | $4.99 | one-time |


## Frequently asked questions

### Is Digital Sun Dial free?

Digital Sun Dial costs $1.99, with no in-app purchases.

### Is True Solar Time （真太陽時） free?

True Solar Time （真太陽時） is free to download, with in-app purchases available.

### Do Digital Sun Dial or True Solar Time （真太陽時） have ads?

True Solar Time （真太陽時） shows ads; Digital Sun Dial does not.

### Which is updated more often, Digital Sun Dial or True Solar Time （真太陽時）?

Digital Sun Dial ships an update daily, and True Solar Time （真太陽時） every 5 days. Most recently, Digital Sun Dial was updated on October 9, 2026 and True Solar Time （真太陽時） on October 28, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*