# PDF Book Read vs Knowra

The clearest difference is in-app purchases: Knowra at none against PDF Book Read's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Book Read sells 2 in-app purchases, starting at $1.99 per year. Knowra asks for nothing beyond the download.

## The numbers

| Metric | PDF Book Read | Knowra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 9 MB | 9 MB |
| Requires iOS | 26.2 | **26.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yuya Takamoto](https://appshunter.io/developer/1881459297) | [LE ANH TUAN](https://appshunter.io/developer/1857237273) |

## What reviewers say

### PDF Book Read

[App page](https://appshunter.io/ios/app/pdf-book-read/id6760929497)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Premium | $1.99 | per year |
| Lifetime Premium | $2.99 | one-time |


### Knowra

[App page](https://appshunter.io/ios/app/knowra-learn-without-trying/id6762287107)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Book Read free?

PDF Book Read is free to download, with in-app purchases available.

### Is Knowra free?

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

### Do PDF Book Read or Knowra have ads?

Neither PDF Book Read nor Knowra shows ads.

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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.*