# Thorium Reader vs Calibre View

The clearest difference is rating: Calibre View at 5.0 against Thorium Reader's 3.6. Calibre View also leads on review sentiment (67% vs 38%). Thorium Reader's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Calibre View holds the better App Store score, 5.0 against 3.6. Both are backed by a comparable volume of ratings — 11 and 4 respectively. Written reviews point the same way: 38% of Thorium Reader's written reviews are positive against 67% of Calibre View's.

Thorium Reader ships an update every 3 weeks, Calibre View every 6 weeks. The most recent releases landed on September 28, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Thorium Reader | Calibre View |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (11 ratings)](https://appshunter.io/ios/app/thorium-reader/id6745025189/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/calibre-view/id6756579355/reviews)** |
| Number of ratings | **11** | 4 |
| Positive reviews | 37.5% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 46 MB | 38 MB |
| Requires iOS | 26.1 | 26.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Readium](https://appshunter.io/developer/1232183924) | [DANIEL EDWARD LAMSON](https://appshunter.io/developer/1861529617) |

## What reviewers say

### 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


### Calibre View

[App page](https://appshunter.io/ios/app/calibre-view/id6756579355)

Browse and manage your Calibre ebook library on iOS devices. Connect to cloud storage or local files for fast searching, sorting, and filtering. Optimized for large collections and works offline once downloaded.

**Highlights:** Connect to cloud storage (Dropbox, Google Drive, OneDrive, iCloud, WebDAV), Browse library with metadata only, Optimized for large libraries (15,000+ books), Customizable book list columns and sorting, Fast search and filtering by tags, authors, series, Download books locally for offline reading, Supports multiple libraries and quick switching

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

**In-app purchases:** none


## Frequently asked questions

### Is Thorium Reader free?

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

### Is Calibre View free?

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

### Which has better reviews, Thorium Reader or Calibre View?

Calibre View is rated higher. Thorium Reader averages 3.6 out of 5 from 11 ratings, while Calibre View averages 5.0 from 4 ratings.

### Do Thorium Reader or Calibre View have ads?

Neither Thorium Reader nor Calibre View shows ads.

### Which is updated more often, Thorium Reader or Calibre View?

Thorium Reader ships an update every 3 weeks, and Calibre View every 6 weeks. Most recently, Thorium Reader was updated on September 28, 2026 and Calibre View on September 20, 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.*