# Solar Circadian Clock vs Chrono

The clearest difference is ads: Chrono at none against Solar Circadian Clock's shown. Solar Circadian Clock's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 18.6). On price and in-app purchases there is nothing between them.

Both are free to download. Solar Circadian Clock sells 1 one-off in-app purchase and Chrono sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Solar Circadian Clock | Chrono |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 3 days |
| Size | 33 MB | 582 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Damien Devillian](https://appshunter.io/developer/1785838605) | [Leonardo Barros Bilhalva](https://appshunter.io/developer/1868122530) |

## What reviewers say

### Solar Circadian Clock

[App page](https://appshunter.io/ios/app/solar-circadian-clock/id6739723405)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $3.99 | one-time |


### Chrono

[App page](https://appshunter.io/ios/app/chrono-sleep-tracker/id6757658348)

**Features:** Family Sharing

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chrono Premium - Monthly | $4.99 | per month |
| Chrono Premium - Monthly | $4.99 | per month |
| Chrono Premium - Annual 60% Off | $11.99 | per year |
| Chrono Premium - Annual | $20.99 | per year |
| Chrono Premium - Annual | $20.99 | per year |
| Chrono Premium - Annual | $29.99 | per year |


## Frequently asked questions

### Is Solar Circadian Clock free?

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

### Is Chrono free?

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

### Do Solar Circadian Clock or Chrono have ads?

Solar Circadian Clock shows ads; Chrono 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.*