Thorium Reader

Thorium Reader

Read it your way

11 ratings
8 reviews
Free

Details

Released
April 30, 2026
Updated
September 23, 2026

Features

Thorium Reader screenshot #1 for iPhone
Thorium Reader screenshot #2 for iPhone
Thorium Reader screenshot #3 for iPhone
Thorium Reader screenshot #4 for iPhone
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About

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.

✓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
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What's New in Thorium Reader

1.3.1

September 23, 2026

• New: Tap to zoom on images • New: Translated in Slovenian • Update: Improved support for full-bleed images in EPUB • Update: Various bug fixes and improvements related to iOS/iPadOS 27

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User reviews

Shows promise.

Format editing to suit one's preferences is good. Unfortunately, it has a flaw that a heavy reader will soon discover: it doesn't do true author sort. Sure, it puts the list of books in order by author, but if you have a lot of books by a prolific author, you're gonna be scrolling forever. (Apple Books is also awful this way.)

Needs to have an author-sort that returns a list of authors, so one can tap-through to get the authors books. (Which should then be internally sortable by date-added, alphabetical, or – and this is a tricky one – publication order, which might have to be added by the user.)

Ideally, it would also have a way to change the cover (say, you have Phonto and are making covers for fanfic from AO3), but I'm not seeing this just now. I'll try to come back and edit the review if I'm wrong.

There's also no way to give money to the devs? Concerning. We lost Marvin (the ideal ereader) because the app wasn't drawing in enough to sustain the App Store fee.
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Response from developer

You can find all books from any given author contextually by tapping and holding (or tapping on …), selecting "Contributors" and then selecting the contributor that you want. You can also search by author, this is supported as well. True author sorting can be difficult because EPUB files often lack a string to sort them properly, so you end up with a mix of cases where either the first name or last name is listed first. Feel free to contact us through our support (https://support.thoriumreader.com) or Discord server to discuss this further, we're always glad to receive this sort of feedback.

Garbage

Lacking the most basic readability options like changing zoom, font size, continuous scrolling, etc.
Not even turning to landscape mode zooms in properly, it shows you two pages at once!! If you can’t read the tiny default font then you have to zoom in manually on EVERY PAGE.

Response from developer

You've probably opened a PDF or EPUB Fixed Layout if you cannot change the font size. These formats are not designed to allow the user to change the font size, you need a normal EPUB for that (also called a reflowable EPUB). Zooming is supported on both PDF and EPUB Fixed Layout using pinch to zoom. Feel free to contact our support at ios@thoriumreader.com or https://support.thoriumreader.com for additional help.

Shortfalls

I am currently using this reader app because this is the only way that I could check a digital book out from my university library. While I appreciate the ability to read the text, I do have ADHD and dyslexia and accessibility functions are lacking. It can read to me which can help me better understand the material versus reading myself. For best comprehension I need to both hear and read along. I am not able to do that in this app. I am not sure if this is a function of the reader or a limitation of the book itself. This is an area where the developers could really improve the app.
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Response from developer

Improving our support for audio is at the top of our roadmap right now. With our 1.4 version (planned for October/November) we'll introduce support for audiobooks as well as additional controls for the read aloud feature. Being able to read and listen at the same time is on our list of planned features, with controls over what gets highlighted (sentence, word or both) and how (control over color and style).

Clean interface

Minimal and quite comforting

New go-to for epubs

Just downloaded it, love the simplicity. Range of choices is just enough without complicating the reading experience. 👍👍

FAQ

What types of digital content can Thorium Reader handle?

Thorium Reader supports a wide range of digital content, including ebooks, documents, comics, and manga. You can import files in EPUB, PDF, and CBZ formats.

Can I customize the reading experience in Thorium Reader?

Yes, Thorium Reader offers extensive customization options. You can adjust text size, choose from over 10 fonts, switch between color schemes with themes, and control spacing to suit your preferences.

Does Thorium Reader offer text-to-speech functionality?

Yes, Thorium Reader allows you to listen to any ebook. The app remembers your preference for audio playback, making it convenient to switch between reading and listening.

Is Thorium Reader available on multiple devices?

Thorium Reader is designed for iOS devices, specifically supporting iPhones and iPads. This allows for a consistent reading experience across your Apple mobile devices.

Does Thorium Reader have ads?

No, Thorium Reader is ad-free. As a non-profit dedicated to open standards and literacy, the app focuses on providing an uninterrupted reading experience without advertisements.

Can I use the dictionary and translation features offline in Thorium Reader?

Yes, Thorium Reader includes built-in iOS dictionary and translation features that can be used even when you are offline. This is particularly useful for reading on the go without an internet connection.

How often is Thorium Reader updated?

Thorium Reader was last updated on May 12, 2026, with version 1.1. The developer, EDRLab, is dedicated to open standards, suggesting a commitment to ongoing improvements and support.

What is the age rating for Thorium Reader?

Thorium Reader has an age rating of 4+. This indicates that the app is suitable for children aged 4 and above, with no mature content restrictions.