# Thorium Reader vs Duri

The clearest difference is rating: Duri at 5.0 against Thorium Reader's 3.5. Duri also leads on update cadence (daily vs every 3 weeks). Thorium Reader's advantage is in-app purchases (none vs 1) and ratings volume (13 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

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

Duri holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Thorium Reader has 13 ratings behind it against 1, so its average is the more settled of the two.

Thorium Reader ships an update every 3 weeks, Duri daily. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Thorium Reader | Duri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (13 ratings)](https://appshunter.io/ios/app/thorium-reader/id6745025189/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/duri-book-and-pdf-reader/id6814625727/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | **Free** | Freemium |
| Size | 46 MB | 247 MB |
| Requires iOS | 26.1 | **26.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Readium](https://appshunter.io/developer/1232183924) | [NEERAJ SHARMA](https://appshunter.io/developer/6792976772) |

## 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


### Duri

[App page](https://appshunter.io/ios/app/duri-book-and-pdf-reader/id6814625727)

This app reads your EPUBs, PDFs, comics, and text files with realistic page-turning animations. It offers text-to-speech, note-taking, highlighting, and PDF annotation features. Your data stays on your device, and Pro features are available via a one-time purchase.

**Highlights:** Realistic page-turning animations, Text-to-speech with multiple voices, Highlighting and note-taking, PDF annotation tools, Customizable reading themes and fonts, iCloud sync for Pro users, Widgets and Apple Watch remote

**Features:** Family Sharing, Apple Watch app, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Duri Pro | $9.99 | one-time |


## Frequently asked questions

### Is Thorium Reader free?

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

### Is Duri free?

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

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

Duri is rated higher. Thorium Reader averages 3.5 out of 5 from 13 ratings, while Duri averages 5.0 from 1 ratings.

### Do Thorium Reader or Duri have ads?

Neither Thorium Reader nor Duri shows ads.

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

Thorium Reader ships an update every 3 weeks, and Duri daily. Most recently, Thorium Reader was updated on November 8, 2026 and Duri on October 31, 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.*