# BookFusion vs Thorium Reader

The clearest difference is rating: BookFusion at 4.7 against Thorium Reader's 3.5. BookFusion also leads on review sentiment (76% vs 40%) and ratings volume (523 vs 13). Thorium Reader's advantage is in-app purchases (none vs 6). On price, ads and device support there is nothing between them.

Both are free to download. BookFusion sells 6 in-app purchases, starting at $1.99 per month. Thorium Reader asks for nothing beyond the download.

BookFusion holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: BookFusion has 523 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 76% of BookFusion's written reviews are positive against 40% of Thorium Reader's.

BookFusion ships an update every 10 days, Thorium Reader every 3 weeks. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | BookFusion | Thorium Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (523 ratings)](https://appshunter.io/ios/app/bookfusion/id1141834096/reviews)** | [3.5 (13 ratings)](https://appshunter.io/ios/app/thorium-reader/id6745025189/reviews) |
| Number of ratings | **523** | 13 |
| Positive reviews | **76.4% of reviews** | 40.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 158 MB | 46 MB |
| Requires iOS | **15.1** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [BookFusion](https://appshunter.io/developer/1141834095) | [Readium](https://appshunter.io/developer/1232183924) |

## What reviewers say

### BookFusion

[App page](https://appshunter.io/ios/app/bookfusion/id1141834096)

Manage, read, and organize your eBooks across all devices with seamless cloud synchronization. Customize your reading experience with extensive settings, highlight notes, and text-to-speech functionality. Integrates with Calibre and supports various file formats.

**Highlights:** Cross-platform eBook reader and manager, Cloud sync for reading progress and eBooks, Customizable reading experience, Highlighting and annotation tools, Text-to-Speech (TTS) functionality, Calibre integration, Support for EPUB, PDF, CBZ/CBR

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Casual Monthly | $1.99 | per month |
| Advanced Monthly | $4.99 | per month |
| Power Monthly | $9.99 | per month |
| Casual Yearly | $18.99 | per year |
| Advanced Yearly | $47.99 | per year |
| Power Yearly | $95.99 | per year |

**What reviewers like**

- 🚀 Excellent cross-platform sync
- 👍 Highly customizable reading experience
- 🚀 Seamless Calibre integration
- 👍 Responsive and helpful developers
- 🚀 Smooth reading experience

**What reviewers complain about**

- 🐛 Occasional bugs and crashes
- 💰 Subscription model may be costly for some
- 🔒 Requires account creation to use
- 🐛 Inconsistent page turn behavior
- 🐛 Issues with PDF and fixed-layout EPUB support

**Reported bugs**

- Highlights and notes not always saving properly
- Reading position sometimes resets unexpectedly
- Widget not functioning as expected
- Occasional crashes and freezes
- Issues with importing certain ebook formats

**Requested features**

- Add page numbers instead of just percentages
- Implement a true dark mode
- Improve PDF viewing and annotation capabilities
- Add support for DJVU format
- Provide an option to purchase a lifetime license


### Thorium Reader

[App page](https://appshunter.io/ios/app/thorium-reader/id6745025189)

Organize all your ebooks, comics, and manga in a single app. Customize your reading experience with adjustable text, fonts, and themes. Listen to audiobooks and zoom into visual content with ease.

**Highlights:** Unified bookshelf for all content, Adjustable text size and spacing, Multiple font options, Text-to-speech audio playback, Zoom for comics and manga, Offline dictionary and translation, Import EPUB, PDF, CBZ files

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

**In-app purchases:** none


## Frequently asked questions

### Is BookFusion free?

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

### Is Thorium Reader free?

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

### Which has better reviews, BookFusion or Thorium Reader?

BookFusion is rated higher. BookFusion averages 4.7 out of 5 from 523 ratings, while Thorium Reader averages 3.5 from 13 ratings.

### Do BookFusion or Thorium Reader have ads?

Neither BookFusion nor Thorium Reader shows ads.

### Which is updated more often, BookFusion or Thorium Reader?

BookFusion ships an update every 10 days, and Thorium Reader every 3 weeks. Most recently, BookFusion was updated on November 2, 2026 and Thorium Reader on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*