# AtomicClock vs Precise Timestamp

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

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

Precise Timestamp holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 84% of AtomicClock's written reviews are positive against 100% of Precise Timestamp's.

AtomicClock ships an update every 3 weeks, Precise Timestamp every 5 weeks. The most recent releases landed on October 12, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AtomicClock | Precise Timestamp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/precise-timestamp/id6463294734/reviews)** |
| Number of ratings | **5.5K** | 7 |
| Positive reviews | 84.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 19 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Timo Partl](https://appshunter.io/developer/1387413672) | [Chris Gillin](https://appshunter.io/developer/1565599090) |

## 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


### Precise Timestamp

[App page](https://appshunter.io/ios/app/precise-timestamp/id6463294734)

Capture events with unparalleled accuracy, down to the tenth of a second. Synchronize with NTP servers for precise timekeeping and view detailed sync information. Organize events with descriptions and toggle between absolute and relative time displays.

**Highlights:** NTP server synchronization, Tenth-of-a-second accuracy, Absolute and relative time modes, Event descriptions, Event sorting and grouping, Sync time details

**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 Precise Timestamp free?

Precise Timestamp is free to download, with no in-app purchases.

### Which has better reviews, AtomicClock or Precise Timestamp?

Precise Timestamp is rated higher. AtomicClock averages 4.8 out of 5 from 5.5K ratings, while Precise Timestamp averages 5.0 from 7 ratings.

### Do AtomicClock or Precise Timestamp have ads?

AtomicClock shows ads; Precise Timestamp does not.

### Which is updated more often, AtomicClock or Precise Timestamp?

AtomicClock ships an update every 3 weeks, and Precise Timestamp every 5 weeks. Most recently, AtomicClock was updated on October 12, 2026 and Precise Timestamp on September 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*