# Solar Circadian Clock vs SleepisolBio

The clearest difference is in-app purchases: SleepisolBio at none against Solar Circadian Clock's 1. SleepisolBio also leads on ads (none vs shown). Solar Circadian Clock's advantage is iOS requirement (13.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Solar Circadian Clock sells 1 one-off in-app purchase. SleepisolBio asks for nothing beyond the download.

## The numbers

| Metric | Solar Circadian Clock | SleepisolBio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | — | Every 10 days |
| Size | 33 MB | 1.1 GB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Damien Devillian](https://appshunter.io/developer/1785838605) | [leesol](https://appshunter.io/developer/1584929445) |

## 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 |


### SleepisolBio

[App page](https://appshunter.io/ios/app/sleepisolbio/id6739985543)

**In-app purchases:** none


## Frequently asked questions

### Is Solar Circadian Clock free?

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

### Is SleepisolBio free?

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

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

Solar Circadian Clock shows ads; SleepisolBio 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.*