# Book vs Codex Books

The clearest difference is in-app purchases: Book at none against Codex Books's 1. Codex Books's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. Codex Books sells 1 one-off in-app purchase. Book asks for nothing beyond the download.

## The numbers

| Metric | Book | Codex Books |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 3 days |
| Size | 1 MB | 6 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Maren Bellamy](https://appshunter.io/developer/1887168890) | [Shinro OU](https://appshunter.io/developer/6780296771) |

## What reviewers say

### Book

[App page](https://appshunter.io/ios/app/book-train-your-knowledge/id6760989511)

**In-app purchases:** none


### Codex Books

[App page](https://appshunter.io/ios/app/codex-books/id6794109669)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Library (Lifetime) | $5.99 | one-time |


## Frequently asked questions

### Is Book free?

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

### Is Codex Books free?

Codex Books is free to download, with in-app purchases available.

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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.*