# AtomicClock vs Exact Seconds

The clearest difference is rating: AtomicClock at 4.8 against Exact Seconds's 4.0. AtomicClock also leads on ratings volume (5.5K vs 4) and device support (3 vs 1). Exact Seconds's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price there is nothing between them.

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

AtomicClock holds the better App Store score, 4.8 against 4.0. 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 complicate that: 84% of AtomicClock's written reviews are positive against 100% of Exact Seconds's, so the app with the better star average is not the one people write more warmly about.

AtomicClock ships an update every 3 weeks, Exact Seconds every 9 days. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | AtomicClock | Exact Seconds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/exact-seconds/id6782631455/reviews) |
| Number of ratings | **5.5K** | 4 |
| Positive reviews | 84.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 7 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [Vagram Malkhasian](https://appshunter.io/developer/1896762232) |

## 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


### Exact Seconds

[App page](https://appshunter.io/ios/app/exact-seconds/id6782631455)

This utility displays the current time with second-level precision, offering a large, readable clock and customizable widgets for your home and lock screens. It's designed for situations where exact timing is crucial, providing a clean and focused experience without ads or tracking.

**Highlights:** Large in-app clock with live seconds, Home Screen widget with live seconds, Lock Screen widget with live seconds, Customizable widget appearance, Multiple in-app clock colors, Optional in-app date display

**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 Exact Seconds free?

Exact Seconds is free to download, with no in-app purchases.

### Which has better reviews, AtomicClock or Exact Seconds?

AtomicClock is rated higher. AtomicClock averages 4.8 out of 5 from 5.5K ratings, while Exact Seconds averages 4.0 from 4 ratings.

### Do AtomicClock or Exact Seconds have ads?

AtomicClock shows ads; Exact Seconds does not.

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

AtomicClock ships an update every 3 weeks, and Exact Seconds every 9 days. Most recently, AtomicClock was updated on October 12, 2026 and Exact Seconds on September 30, 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.*