# Libraryai vs Reader King

The clearest difference is in-app purchases: Libraryai at none against Reader King's 1. Libraryai also leads on iOS requirement (15.1 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Reader King sells 1 one-off in-app purchase. Libraryai asks for nothing beyond the download.

Libraryai ships an update every 2 months, Reader King every 4 weeks. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Libraryai | Reader King |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Size | 28 MB | 6 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Daniil Sukhov](https://appshunter.io/developer/1630543160) | [lecoo](https://appshunter.io/developer/1630534948) |

## What reviewers say

### Libraryai

[App page](https://appshunter.io/ios/app/libraryai/id6762076708)

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

**In-app purchases:** none


### Reader King

[App page](https://appshunter.io/ios/app/reader-king/id6785942008)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reader King Enhanced | $0.99 | one-time |


## Frequently asked questions

### Is Libraryai free?

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

### Is Reader King free?

Reader King is free to download, with in-app purchases available.

### Do Libraryai or Reader King have ads?

Neither Libraryai nor Reader King shows ads.

### Which is updated more often, Libraryai or Reader King?

Libraryai ships an update every 2 months, and Reader King every 4 weeks. Most recently, Libraryai was updated on October 25, 2026 and Reader King on October 28, 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.*