# Concentration Clock vs World Clock with Aurora

The clearest difference is ads: World Clock with Aurora at none against Concentration Clock's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Concentration Clock | World Clock with Aurora |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | — | Fortnightly |
| Size | 39 MB | 26 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ais Business Mexico S.A. de C.V.](https://appshunter.io/developer/1764495798) | [Hangik Lee](https://appshunter.io/developer/1893677570) |

## What reviewers say

### Concentration Clock

[App page](https://appshunter.io/ios/app/concentration-clock/id6740191750)

**Features:** macOS Compatibility

**In-app purchases:** none


### World Clock with Aurora

[App page](https://appshunter.io/ios/app/world-clock-with-aurora/id6762291120)

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

**In-app purchases:** none


## Frequently asked questions

### Is Concentration Clock free?

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

### Is World Clock with Aurora free?

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

### Do Concentration Clock or World Clock with Aurora have ads?

Concentration Clock shows ads; World Clock with Aurora does not.

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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.*