# Epub Studio vs Onyx Box

The clearest difference is in-app purchases: Epub Studio at none against Onyx Box's 3. Onyx Box's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Onyx Box sells 3 in-app purchases, starting at $8.99 per month. Epub Studio asks for nothing beyond the download.

## The numbers

| Metric | Epub Studio | Onyx Box |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 5 days |
| Size | 2 MB | 16 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Marcel Petersen](https://appshunter.io/developer/1829216633) | [Tony Bell](https://appshunter.io/developer/6798628931) |

## What reviewers say

### Epub Studio

[App page](https://appshunter.io/ios/app/epub-studio/id6796310952)

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

**In-app purchases:** none


### Onyx Box

[App page](https://appshunter.io/ios/app/onyx-box/id6798628929)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Onyx Backup Monthly | $8.99 | per month |
| Onyx Save | $0.99 | one-time |
| Onyx Drive | $1.99 | one-time |


## Frequently asked questions

### Is Epub Studio free?

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

### Is Onyx Box free?

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

### Do Epub Studio or Onyx Box have ads?

Neither Epub Studio nor Onyx Box 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.*