# SideBooks vs eBook UST

The clearest difference is in-app purchases: eBook UST at none against SideBooks's 1. SideBooks's advantage is iOS requirement (9.0 vs 12.0). On price, ads and device support there is nothing between them.

Both are free to download. SideBooks sells 1 one-off in-app purchase. eBook UST asks for nothing beyond the download.

## The numbers

| Metric | SideBooks | eBook UST |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (97 ratings)](https://appshunter.io/ios/app/sidebooks/id409777225/reviews)** | — |
| Number of ratings | **97** | — |
| Positive reviews | 73.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 78 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tatsumi-system Co., Ltd.](https://appshunter.io/developer/409777230) | [Altaif Kuala Lumpur Sdn. Bhd.](https://appshunter.io/developer/1712297021) |

## What reviewers say

### SideBooks

[App page](https://appshunter.io/ios/app/sidebooks/id409777225)

This app offers a high-performance PDF and comic viewer with realistic paper-turning animations. It supports various viewing directions, enhanced bookshelf management, and secure password protection for your documents. Easily import files from multiple sources and enjoy a customizable reading experience.

**Highlights:** Realistic paper curl animation, Multiple viewing directions, Enhanced bookshelf management, Password protection, Dropbox and iTunes file import, Supports PDF, ZIP, CBZ, RAR, CBR

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thema extension Add-On | $0.99 | one-time |

**What reviewers like**

- 🚀 Smooth page turning
- 📚 Great for reading comics and manga
- 🗂️ Excellent folder organization
- 🔍 Useful search and table of contents features
- 💻 Seamless Dropbox integration

**What reviewers complain about**

- 🐛 Crashes when loading large files
- 🚫 Limited file format support (no CBZ/CBR)
- 🔍 Difficult to find and delete books
- 🔒 Requires Dropbox access, no local file support
- 🔍 Small thumbnail size makes it hard to browse

**Reported bugs**

- Crashes when opening certain PDF files
- Corrupted files cause repeated crashes
- Dropbox integration issues on some devices

**Requested features**

- Add support for ePub and other popular formats
- Implement iCloud/Google Drive integration
- Allow manual rearrangement of bookshelf
- Add dark mode and customizable background options
- Improve bookmark and annotation features


### eBook UST

[App page](https://appshunter.io/ios/app/ebook-ust/id6474415217)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is SideBooks free?

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

### Is eBook UST free?

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

### Do SideBooks or eBook UST have ads?

Neither SideBooks nor eBook UST 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.*