# AtomicClock vs GMT Time

The clearest difference is in-app purchases: GMT Time at none against AtomicClock's 1. AtomicClock's advantage is ratings volume (5.5K vs 37). On price, rating, ads and device support there is nothing between them.

Both are free to download. AtomicClock sells 1 one-off in-app purchase. GMT Time asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for AtomicClock against 4.7 for GMT Time. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 37, so its average is the more settled of the two.

## The numbers

| Metric | AtomicClock | GMT Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** | [4.7 (37 ratings)](https://appshunter.io/ios/app/gmt-time/id1613023691/reviews) |
| Number of ratings | **5.5K** | 37 |
| Positive reviews | 84.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | — |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 17 MB | 10 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [MingChun Chien](https://appshunter.io/developer/1181368598) |

## What reviewers say

### 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


### GMT Time

[App page](https://appshunter.io/ios/app/gmt-time/id1613023691)

This app provides accurate GMT time using NTP protocol and TrueTime framework. It offers a timekeeping function, allows setting time between two locations for itineraries, and supports multiple languages. Enjoy precise timekeeping with 1/100 second accuracy.

**Highlights:** Accurate GMT time display, NTP and TrueTime framework integration, Timekeeping function (on/off), Set time between two locations, Multi-language support (English, Japanese, Chinese, Cantonese), 1/100 second accuracy

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

**In-app purchases:** none


## Frequently asked questions

### Is AtomicClock free?

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

### Is GMT Time free?

GMT Time is free to download, with no in-app purchases.

### Which has better reviews, AtomicClock or GMT Time?

AtomicClock is rated higher. AtomicClock averages 4.8 out of 5 from 5.5K ratings, while GMT Time averages 4.7 from 37 ratings.

### Do AtomicClock or GMT Time have ads?

Both AtomicClock and GMT Time show ads.

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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.*