# Sun Clock App vs AtomicClock

The clearest difference is rating: AtomicClock at 4.8 against Sun Clock App's 4.3. AtomicClock also leads on update cadence (every 3 weeks vs every 33 months) and ratings volume (5.5K vs 4). Sun Clock App's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Sun Clock App sells 1 one-off in-app purchase and AtomicClock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

AtomicClock holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 60% of Sun Clock App's written reviews are positive against 84% of AtomicClock's.

Sun Clock App ships an update every 33 months, AtomicClock every 3 weeks. The most recent releases landed on September 25, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Sun Clock App | AtomicClock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/sun-clock-app/id1104328257/reviews) | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** |
| Number of ratings | 4 | **5.5K** |
| Positive reviews | 60.0% of reviews | **84.2% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 33 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 17 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [Timo Partl](https://appshunter.io/developer/1387413672) |

## What reviewers say

### Sun Clock App

[App page](https://appshunter.io/ios/app/sun-clock-app/id1104328257)

This utility app displays the current time and the sun's position for your location. It shows solar time, sunrise, and sunset, with options to toggle seconds and 12/24-hour formats. The app automatically updates your location and can keep your device awake for continuous display.

**Highlights:** Shows solar time, Displays sunrise and sunset times, Toggle seconds display, 12/24 hour format option, Automatic location updates, Keeps device awake

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sun Clock - Upgrade | $0.99 | one-time |


### AtomicClock

[App page](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049)

This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.

**Highlights:** Precise time from NTP servers, Customizable clock faces, Select or add time servers, Local and UTC views, 12/24 hour modes, Customizable time format, Acoustic ticking

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Version | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate time
- 👍 Highly customizable
- 🚀 Precise to the second
- 👍 Easy to use
- 👍 Helpful for setting watches

**What reviewers complain about**

- 🐛 Server connection issues
- 🔍 Limited time zone options
- 💰 Ads diminish clock view
- 🔍 Lacks some advanced features
- 🔍 Redundant for some users

**Reported bugs**

- Crashes on certain iOS versions
- Occasional freezing of hands
- Countdown timer sound not working

**Requested features**

- Add GMT/dual time display
- Implement widget support
- Add different second hand sounds
- Allow setting background color to match watch
- Include alarm/timer functionality


## Frequently asked questions

### Is Sun Clock App free?

Sun Clock App is free to download, with in-app purchases available.

### Is AtomicClock free?

AtomicClock is free to download, with in-app purchases available.

### Which has better reviews, Sun Clock App or AtomicClock?

AtomicClock is rated higher. Sun Clock App averages 4.3 out of 5 from 4 ratings, while AtomicClock averages 4.8 from 5.5K ratings.

### Do Sun Clock App or AtomicClock have ads?

AtomicClock shows ads; Sun Clock App does not.

### Which is updated more often, Sun Clock App or AtomicClock?

Sun Clock App ships an update every 33 months, and AtomicClock every 3 weeks. Most recently, Sun Clock App was updated on September 25, 2026 and AtomicClock on October 12, 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.*