# Atomic Clock App vs Unichrono

The clearest difference is price: Unichrono at Free against Atomic Clock App's $2.99. Unichrono also leads on device support (4 vs 2). Atomic Clock App's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17.0). On ads there is nothing between them.

Unichrono is free to download; Atomic Clock App costs $2.99 up front. Unichrono sells 1 one-off in-app purchase. Atomic Clock App asks for nothing beyond the download.

## The numbers

| Metric | Atomic Clock App | Unichrono |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 days |
| Size | 31 MB | 34 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Gianfranco Antenucci](https://appshunter.io/developer/1875606849) | [Abhilash Emmanuel](https://appshunter.io/developer/6802869223) |

## What reviewers say

### Atomic Clock App

[App page](https://appshunter.io/ios/app/atomic-clock-app/id6760158311)

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

**In-app purchases:** none


### Unichrono

[App page](https://appshunter.io/ios/app/unichrono/id6804218446)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unichrono: World Clock Widget | $2.99 | one-time |


## Frequently asked questions

### Is Atomic Clock App free?

Atomic Clock App costs $2.99, with no in-app purchases.

### Is Unichrono free?

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

### Do Atomic Clock App or Unichrono have ads?

Neither Atomic Clock App nor Unichrono shows ads.

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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.*