# OnlyBooks vs Perfect Viewer X

The clearest difference is price: OnlyBooks at Free against Perfect Viewer X's $4.99. Perfect Viewer X's advantage is update cadence (monthly vs every 5 months) and device support (4 vs 2). On ads, in-app purchases and iOS requirement there is nothing between them.

OnlyBooks is free to download; Perfect Viewer X costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OnlyBooks ships an update every 5 months, Perfect Viewer X monthly. Both last shipped on November 5, 2026.

## The numbers

| Metric | OnlyBooks | Perfect Viewer X |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/perfect-viewer-x/id6781948334/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | — | Paid |
| Size | 51 MB | 79 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Devin Smith](https://appshunter.io/developer/1895330227) | [TA-YU LIN](https://appshunter.io/developer/6781948336) |

## What reviewers say

### OnlyBooks

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Perfect Viewer X

[App page](https://appshunter.io/ios/app/perfect-viewer-x/id6781948334)

A professional reader for image and e-book enthusiasts, this app offers a versatile reading experience across multiple devices. It supports over 20 file formats, advanced image processing, and flexible reading modes, with extensive cloud storage integration.

**Highlights:** Supports over 20 file formats (images, archives, e-books, documents), Professional image processing and adjustment tools, Flexible reading modes (single/dual page, reading direction, scrolling), Cloud and network storage integration (iCloud, Google Drive, SMB, FTP, WebDAV), Highly customizable interface and gestures, Built-in file management and bookshelf, E-book specific features like TOC navigation and full-text search

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OnlyBooks free?

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

### Is Perfect Viewer X free?

Perfect Viewer X costs $4.99, with no in-app purchases.

### Do OnlyBooks or Perfect Viewer X have ads?

Neither OnlyBooks nor Perfect Viewer X shows ads.

### Which is updated more often, OnlyBooks or Perfect Viewer X?

OnlyBooks ships an update every 5 months, and Perfect Viewer X monthly. Most recently, OnlyBooks was updated on November 5, 2026 and Perfect Viewer X on November 5, 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.*