# scrolly vs ZooBook

The clearest difference is update cadence: ZooBook at daily against scrolly's weekly. scrolly's advantage is iOS requirement (17.0 vs 26.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

scrolly ships an update weekly, ZooBook daily. Both last shipped on October 4, 2026.

## The numbers

| Metric | scrolly | ZooBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/scrolly-cute-pdf-ebook-reader/id6738710724/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Daily** |
| Monetization | Free | — |
| Size | 9 MB | 11 MB |
| Requires iOS | **17.0** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [totally important LLC](https://appshunter.io/developer/1759244146) | [Sangwook Joo](https://appshunter.io/developer/6780354751) |

## What reviewers say

### scrolly

[App page](https://appshunter.io/ios/app/scrolly-cute-pdf-ebook-reader/id6738710724)

Transform your PDF reading with a delightful experience. Customize text size and themes, save your progress with bookmarks, and enjoy a unique vertical scrolling mode. Perfect for books, papers, articles, and textbooks.

**Highlights:** Customizable text size, Theme selection, Bookmark saving, Vertical snap-to-scroll, Read books, papers, articles, textbooks

**Features:** macOS Compatibility

**In-app purchases:** none


### ZooBook

[App page](https://appshunter.io/ios/app/zoobook/id6780354749)

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

**In-app purchases:** none


## Frequently asked questions

### Is scrolly free?

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

### Is ZooBook free?

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

### Do scrolly or ZooBook have ads?

Neither scrolly nor ZooBook shows ads.

### Which is updated more often, scrolly or ZooBook?

scrolly ships an update weekly, and ZooBook daily. Most recently, scrolly was updated on October 4, 2026 and ZooBook on October 4, 2026.

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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.*