# Dieter Clock vs Atomic Clock

The clearest difference is in-app purchases: Dieter Clock at none against Atomic Clock's 2. Dieter Clock also leads on device support (4 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Atomic Clock sells 2 in-app purchases, starting at $5.99 per month. Dieter Clock asks for nothing beyond the download.

Dieter Clock ships an update every 3 weeks, Atomic Clock every 6 weeks. The most recent releases landed on October 16, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Dieter Clock | Atomic Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/atomic-clock-precision-time/id6760377377/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 9 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Oguzhan Bilgin](https://appshunter.io/developer/1848626364) | [家宝 戴](https://appshunter.io/developer/1826395838) |

## What reviewers say

### Dieter Clock

[App page](https://appshunter.io/ios/app/dieter-clock/id6754521171)

**In-app purchases:** none


### Atomic Clock

[App page](https://appshunter.io/ios/app/atomic-clock-precision-time/id6760377377)

This utility provides highly accurate time synchronization using NTP, displaying precise time with millisecond detail. It allows comparison with network time, shows sync offset and latency, and offers various clock styles with customization options. It's designed for users needing a reliable, precise reference clock.

**Highlights:** NTP-based time synchronization, Millisecond time detail, Local time and UTC display, Device offset and network latency indicators, Automatic sync, Multiple clock styles, Customizable colors and night mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AtomicClock Pro Monthly | $5.99 | per month |
| AtomicClock Pro Monthly | $19.99 | per year |


## Frequently asked questions

### Is Dieter Clock free?

Dieter Clock is free to download, with no in-app purchases.

### Is Atomic Clock free?

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

### Do Dieter Clock or Atomic Clock have ads?

Neither Dieter Clock nor Atomic Clock shows ads.

### Which is updated more often, Dieter Clock or Atomic Clock?

Dieter Clock ships an update every 3 weeks, and Atomic Clock every 6 weeks. Most recently, Dieter Clock was updated on October 16, 2026 and Atomic Clock on October 23, 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.*