# EPUB Compressor vs FormatBox

The clearest difference is iOS requirement: EPUB Compressor at 15.5 against FormatBox's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. EPUB Compressor sells 2 in-app purchases, starting at $2.99 per month and FormatBox sells 4 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

EPUB Compressor ships an update every 2 months, FormatBox monthly. Both last shipped on October 25, 2026.

## The numbers

| Metric | EPUB Compressor | FormatBox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 60 MB | 21 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [SAMUEL NNAEMEKA ON YE JI](https://appshunter.io/developer/1875980282) | [ZHENGQIAO JIANG](https://appshunter.io/developer/1892168889) |

## What reviewers say

### EPUB Compressor

[App page](https://appshunter.io/ios/app/epub-compressor-litebook/id6762126215)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| monthly | $2.99 | per month |
| yearly | $19.99 | per year |


### FormatBox

[App page](https://appshunter.io/ios/app/formatbox-file-converter/id6766389681)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $4.99 | per month |
| Yearly | $29.99 | per year |
| Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is EPUB Compressor free?

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

### Is FormatBox free?

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

### Do EPUB Compressor or FormatBox have ads?

Neither EPUB Compressor nor FormatBox shows ads.

### Which is updated more often, EPUB Compressor or FormatBox?

EPUB Compressor ships an update every 2 months, and FormatBox monthly. Most recently, EPUB Compressor was updated on October 25, 2026 and FormatBox on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*