# Metric Seconds vs AtomicClock

The clearest difference is in-app purchases: Metric Seconds at none against AtomicClock's 1. Metric Seconds also leads on ads (none vs shown) and review sentiment (100% vs 84%). AtomicClock's advantage is update cadence (every 3 weeks vs every 7 months) and ratings volume (5.5K vs 15). On price, device support and iOS requirement there is nothing between them.

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

AtomicClock holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 15, so its average is the more settled of the two. Written reviews complicate that: 100% of Metric Seconds's written reviews are positive against 84% of AtomicClock's, so the app with the better star average is not the one people write more warmly about.

Metric Seconds ships an update every 7 months, AtomicClock every 3 weeks. The most recent releases landed on September 30, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Metric Seconds | AtomicClock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (15 ratings)](https://appshunter.io/ios/app/metric-seconds/id1257282334/reviews) | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** |
| Number of ratings | 15 | **5.5K** |
| Positive reviews | **100.0% of reviews** | 84.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 17 MB |
| Requires iOS | **14.1** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tangozulu R&D](https://appshunter.io/developer/373001554) | [Timo Partl](https://appshunter.io/developer/1387413672) |

## What reviewers say

### Metric Seconds

[App page](https://appshunter.io/ios/app/metric-seconds/id1257282334)

This utility app simplifies time calculations by converting to and from metric units. It allows users to tell and measure time using seconds as the base unit, with multipliers like kilo, Mega, and Giga for larger durations. It offers a fun and practical way to approach time measurement, especially for scientific or engineering contexts.

**Highlights:** Convert time to and from metric units, Tell time in metric, Measure time in metric, Uses seconds as the base unit, Supports metric multipliers (kilo, Mega, Giga), UTC-based time with no time zones

**Features:** macOS Compatibility

**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 Metric Seconds free?

Metric Seconds 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, Metric Seconds or AtomicClock?

AtomicClock is rated higher. Metric Seconds averages 4.5 out of 5 from 15 ratings, while AtomicClock averages 4.8 from 5.5K ratings.

### Do Metric Seconds or AtomicClock have ads?

AtomicClock shows ads; Metric Seconds does not.

### Which is updated more often, Metric Seconds or AtomicClock?

Metric Seconds ships an update every 7 months, and AtomicClock every 3 weeks. Most recently, Metric Seconds was updated on September 30, 2026 and AtomicClock on October 17, 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.*