# ZBook vs OnlyBooks

The clearest difference is update cadence: ZBook at every 2 days against OnlyBooks's monthly. 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.

ZBook ships an update every 2 days, OnlyBooks monthly. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | ZBook | OnlyBooks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (4 ratings)](https://appshunter.io/ios/app/zbook/id1643735475/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Free | — |
| Size | 0 MB | 55 MB |
| Requires iOS | **15.5** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ben Shabowski](https://appshunter.io/developer/1643730054) | [Devin Smith](https://appshunter.io/developer/1895330227) |

## What reviewers say

### ZBook

[App page](https://appshunter.io/ios/app/zbook/id1643735475)

Organize your personal library with this app. Create custom shelves to categorize your books and easily move them between shelves. Keep your reading collection tidy and accessible.

**Highlights:** Add and track books, Create custom shelves, Move books between shelves, Organize personal library, Simple interface

**In-app purchases:** none


### OnlyBooks

[App page](https://appshunter.io/ios/app/onlybooks/id6763473613)

**Features:** macOS Compatibility, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is ZBook free?

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

### Is OnlyBooks free?

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

### Do ZBook or OnlyBooks have ads?

Neither ZBook nor OnlyBooks shows ads.

### Which is updated more often, ZBook or OnlyBooks?

ZBook ships an update every 2 days, and OnlyBooks monthly. Most recently, ZBook was updated on November 3, 2026 and OnlyBooks on November 9, 2026.

---

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