# Thorium Reader vs Sutra

The clearest difference is in-app purchases: Thorium Reader at none against Sutra's 4. Sutra's advantage is rating (4.3 vs 3.9) and update cadence (every 2 weeks vs every 2 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. Sutra sells 4 one-off in-app purchases. Thorium Reader asks for nothing beyond the download.

Sutra holds the better App Store score, 4.3 against 3.9. Both are backed by a comparable volume of ratings — 9 and 9 respectively. Written reviews point the same way: 60% of Thorium Reader's written reviews are positive against 83% of Sutra's.

Thorium Reader ships an update every 2 months, Sutra every 2 weeks. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Thorium Reader | Sutra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (9 ratings)](https://appshunter.io/ios/app/thorium-reader/id6745025189/reviews) | **[4.3 (9 ratings)](https://appshunter.io/ios/app/sutra-ebook-and-comic-reader/id6780096864/reviews)** |
| Number of ratings | 9 | 9 |
| Positive reviews | 60.0% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 45 MB | 39 MB |
| Requires iOS | 26.1 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Readium](https://appshunter.io/developer/1232183924) | [Koustav Dasgupta](https://appshunter.io/developer/6772577121) |

## 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


### Sutra

[App page](https://appshunter.io/ios/app/sutra-ebook-and-comic-reader/id6780096864)

Access your entire book collection from various sources in one beautiful app. Enjoy a customizable reading experience with synced progress, bookmarks, and highlights across devices. Organize your library with series info, search, and collections.

**Highlights:** Connect Kavita, Calibre, and OPDS servers, EPUB and PDF reading with page-curl effect, Rich typography and reading themes, iCloud sync for progress, bookmarks, and highlights, Offline downloads, Highlighting and search functionality, Series grouping and collections

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |
| Sutra Pro | $6.99 | one-time |


## Frequently asked questions

### Is Thorium Reader free?

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

### Is Sutra free?

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

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

Sutra is rated higher. Thorium Reader averages 3.9 out of 5 from 9 ratings, while Sutra averages 4.3 from 9 ratings.

### Do Thorium Reader or Sutra have ads?

Neither Thorium Reader nor Sutra shows ads.

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

Thorium Reader ships an update every 2 months, and Sutra every 2 weeks. Most recently, Thorium Reader was updated on September 10, 2026 and Sutra on September 21, 2026.

---

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