# BookPDF vs Wunder

The clearest difference is iOS requirement: Wunder at 16.0 against BookPDF's 18. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 days. Both last shipped on October 11, 2026.

## The numbers

| Metric | BookPDF | Wunder |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 days | Every 2 days |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 324 MB |
| Requires iOS | 18 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuta Sugawara](https://appshunter.io/developer/1867695269) | [国城 林](https://appshunter.io/developer/1839670511) |

## What reviewers say

### BookPDF

[App page](https://appshunter.io/ios/app/bookpdf/id6758102700)

**Features:** macOS Compatibility

**In-app purchases:** none


### Wunder

[App page](https://appshunter.io/ios/app/wunder-3d-bookshelf-reader/id6761174770)

Organize your personal library of EPUB, TXT, and PDF files on a virtual bookshelf. Enjoy reading with annotation tools or listen to your books with read-aloud playback. Save and share highlighted passages as note cards.

**Highlights:** 3D virtual bookshelf organization, EPUB, TXT, PDF file support, Read-aloud playback, Highlighting and annotation, Note card creation from excerpts, Bookmark management

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

**In-app purchases:** none


## Frequently asked questions

### Is BookPDF free?

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

### Is Wunder free?

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

### Do BookPDF or Wunder have ads?

Neither BookPDF nor Wunder shows ads.

### Which is updated more often, BookPDF or Wunder?

BookPDF ships an update every 2 days, and Wunder every 2 days. Most recently, BookPDF was updated on October 11, 2026 and Wunder on October 11, 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.*