# YTHSDigi vs Kepler

The clearest difference is in-app purchases: YTHSDigi at none against Kepler's 4. YTHSDigi also leads on ads (none vs shown). Kepler's advantage is iOS requirement (15.1 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Kepler sells 4 in-app purchases, starting at $3.99 per 7 days. YTHSDigi asks for nothing beyond the download.

## The numbers

| Metric | YTHSDigi | Kepler |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | — |
| Size | 140 MB | 61 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Ylioppilaiden terveydenhoitosäätiö](https://appshunter.io/developer/1869611361) | [Astonio Ltd](https://appshunter.io/developer/1516161305) |

## What reviewers say

### YTHSDigi

[App page](https://appshunter.io/ios/app/ythsdigi/id6757919486)

**In-app purchases:** none


### Kepler

[App page](https://appshunter.io/ios/app/kepler-sleep-in-space/id6773698579)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kepler PRO | $3.99 | per 7 days |
| Kepler PRO | $9.99 | per month |
| Kepler PRO | $49.99 | per year |
| Lifetime Access | $99.99 | one-time |


## Frequently asked questions

### Is YTHSDigi free?

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

### Is Kepler free?

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

### Do YTHSDigi or Kepler have ads?

Kepler shows ads; YTHSDigi 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.*