# Emerald Chronometer vs AtomicClock

The clearest difference is in-app purchases: Emerald Chronometer at none against AtomicClock's 1. Emerald Chronometer also leads on review sentiment (97% vs 84%). AtomicClock's advantage is update cadence (every 3 weeks vs every 22 months) and ratings volume (5.5K vs 105). On price, rating, device support and iOS requirement there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for Emerald Chronometer against 4.8 for AtomicClock. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 105, so its average is the more settled of the two. Written reviews are what separate them: 97% of Emerald Chronometer's written reviews are positive against 84% of AtomicClock's.

Emerald Chronometer ships an update every 22 months, AtomicClock every 3 weeks. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Emerald Chronometer | AtomicClock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (105 ratings)](https://appshunter.io/ios/app/emerald-chronometer/id284953670/reviews)** | [4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews) |
| Number of ratings | 105 | **5.5K** |
| Positive reviews | **96.8% of reviews** | 84.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | Every 22 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 311 MB | 17 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Scapa Flow, LLC](https://appshunter.io/developer/635350184) | [Timo Partl](https://appshunter.io/developer/1387413672) |

## What reviewers say

### Emerald Chronometer

[App page](https://appshunter.io/ios/app/emerald-chronometer/id284953670)

Experience highly detailed mechanical watch faces with advanced astronomical and clock complications. Track celestial events, manage time with precision, and explore historical and future dates with interactive displays. Optimized for iPhone and iPod touch.

**Highlights:** Accurate astronomical data (4000 BCE - 2800 CE), Sun, Moon, and planet rise/set times, Mechanical display of Moon phases, Precise local and UTC time, Chronograph with split timer, World-time and calendar watches, Interactive time-travel simulation

**In-app purchases:** none


### 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 Emerald Chronometer free?

Emerald Chronometer is free to download, with no in-app purchases.

### Is AtomicClock free?

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

### Which has better reviews, Emerald Chronometer or AtomicClock?

Emerald Chronometer is rated higher. Emerald Chronometer averages 4.9 out of 5 from 105 ratings, while AtomicClock averages 4.8 from 5.5K ratings.

### Which is updated more often, Emerald Chronometer or AtomicClock?

Emerald Chronometer ships an update every 22 months, and AtomicClock every 3 weeks. Most recently, Emerald Chronometer was updated on October 6, 2026 and AtomicClock on October 14, 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.*