# Open MobileUI vs BookStax

The clearest difference is rating: BookStax at 5.0 against Open MobileUI's 3.4. Open MobileUI's advantage is in-app purchases (none vs 4) and ratings volume (25 vs 1). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. BookStax sells 4 one-off in-app purchases. Open MobileUI asks for nothing beyond the download.

BookStax holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: Open MobileUI has 25 ratings behind it against 1, so its average is the more settled of the two.

Open MobileUI ships an update weekly, BookStax every 9 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Open MobileUI | BookStax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.4 (25 ratings)](https://appshunter.io/ios/app/open-mobileui/id6754266176/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/bookstax/id6761068485/reviews)** |
| Number of ratings | **25** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Free | Free |
| Size | 64 MB | 16 MB |
| Requires iOS | **16.4** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ronas IT OU](https://appshunter.io/developer/1155581652) | [Sven Uwe Hanold](https://appshunter.io/developer/1887623795) |

## What reviewers say

### Open MobileUI

[App page](https://appshunter.io/ios/app/open-mobileui/id6754266176)

Access your self-hosted AI assistant on mobile with a smooth, modern, and privacy-focused client. Enjoy native performance, smart synchronization, and a mobile-first interface for productivity on the go.

**Highlights:** Native performance, Mobile-first interface, Automatic synchronization, Image uploads and file attachments, System-aware dark mode, Secure credential storage

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

**In-app purchases:** none


### BookStax

[App page](https://appshunter.io/ios/app/bookstax/id6761068485)

Access and manage your self-hosted BookStack knowledge base natively on iPhone. Edit pages with a Markdown editor, search your content, and access it offline. Prioritizes privacy with secure API token storage.

**Highlights:** BookStack hierarchy navigation, Full-text search with filters, Markdown editor with live preview, Offline read access, Secure API token connection, Light/Dark/System mode, Multi-language support

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Page | $2.99 | one-time |
| Themes & more Servers | $5.99 | one-time |
| Book | $5.99 | one-time |
| Encyclopaedia | $12.99 | one-time |


## Frequently asked questions

### Is Open MobileUI free?

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

### Is BookStax free?

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

### Which has better reviews, Open MobileUI or BookStax?

BookStax is rated higher. Open MobileUI averages 3.4 out of 5 from 25 ratings, while BookStax averages 5.0 from 1 ratings.

### Do Open MobileUI or BookStax have ads?

Neither Open MobileUI nor BookStax shows ads.

### Which is updated more often, Open MobileUI or BookStax?

Open MobileUI ships an update weekly, and BookStax every 9 days. Most recently, Open MobileUI was updated on October 24, 2026 and BookStax on October 24, 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.*