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SPECIFICTION
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Thorium Reader

thoriumreader.com

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Spec score 7.5 #19 of 27 in Ebook Reader Software

What it is

Thorium Reader is a free reader and library for ebooks, audiobooks, comics, manga, and documents. It runs on Windows, macOS, Linux, iOS, and iPadOS, with minimum versions listed by the maker. Supported material includes EPUB 2/3, fixed-layout EPUB, PDF, DAISY, Web Publications, audiobook formats such as MP3 and FLAC, and comics in CBZ, EPUB, or PDF. The app opens DRM-free publications and Readium LCP-protected titles from compatible retailers or libraries. Downloaded items work offline, although LCP files need an online connection at least once. Readers can change text size, themes, spacing, and fonts, and use keyboard navigation with custom shortcuts. Accessibility support includes JAWS, NVDA, Narrator, and VoiceOver; the iOS statement notes VoiceOver limitations for EPUB and PDF reading. Desktop users can browse OPDS catalogs when providers allow it. EDRLab develops Thorium Reader, and support is offered through a Help Desk and Discord.

Spec sheet

What it does
Thorium Reader is a digital book reader and library for ebooks, audiobooks, comics, manga and documents.Read 3 Oct 2026 · thoriumreader.com
Support
The maker links to a Help Desk and Discord; the desktop specification also points users to guides, a public issue tracker and support channels.Read 3 Oct 2026 · thoriumreader.com
Headquarters
Paris, FranceRead 28 Sep 2026 · thoriumreader.com
Maker
Thorium Reader is developed by EDRLab, a Paris-based non-profit development laboratory created in 2015.Read 3 Oct 2026 · edrlab.org
Accessibility
The site lists support for JAWS, NVDA, Narrator and VoiceOver; its iOS accessibility statement also describes known VoiceOver limitations for EPUB and PDF reading.Read 3 Oct 2026 · thoriumreader.com
Desktop catalogs
The desktop app can add and browse OPDS catalogs, subject to the catalog provider’s options.Read 3 Oct 2026 · thoriumreader.com
Desktop privacy and network use
The desktop specification says the app collects no personal data, while describing anonymized telemetry and version checks when network access is available.Read 3 Oct 2026 · thoriumreader.com
DRM and retailers
It opens Readium LCP-protected publications and DRM-free publications from compatible retailers.Read 3 Oct 2026 · thoriumreader.com
Formats
The reader supports EPUB, fixed-layout EPUB, PDF, several audiobook formats including MP3 and FLAC, and comics in CBZ, EPUB or PDF.Read 3 Oct 2026 · thoriumreader.com
Libraries and free catalogs
It can read compatible Readium LCP library downloads and content obtained from Project Gutenberg, LibriVox and other public-domain or openly licensed sources.Read 3 Oct 2026 · thoriumreader.com
Offline use
Downloaded publications can be read or heard offline; LCP-protected files require an online connection at least once.Read 3 Oct 2026 · thoriumreader.com
Platforms and requirements
It is available for iOS/iPadOS, Windows, macOS and Linux; the site lists iOS/iPadOS 26, Windows 10, macOS 12 Monterey, Ubuntu 18.04, Fedora 32 or Debian 10 as minimum versions.Read 3 Oct 2026 · thoriumreader.com
Reading controls
Readers can adjust text size, themes and spacing, choose from 10+ fonts, and use keyboard navigation with custom shortcuts.Read 3 Oct 2026 · thoriumreader.com
Security assurances
The desktop specification says ISO 27001 and SOC 2 Type II assurances apply to content providers’ services, not to Thorium Reader itself.Read 3 Oct 2026 · thoriumreader.com
Who it is for
The desktop technical specification names the general public, with particular attention to heavy readers, library-goers and students.Read 3 Oct 2026 · thoriumreader.com

Plans and prices

Thorium Reader Free Free on all platforms Read 3 Oct 2026 · thoriumreader.com

Every Thorium Reader plan and price →

Strong points and limits

Strong points

  • Free on all platforms
  • Supports ebooks, audiobooks, and comics
  • Offline reading and listening
  • Multiple accessibility technologies supported
  • Customizable text and spacing

Limits

  • LCP files require an initial online connection
  • iOS VoiceOver has known EPUB and PDF limitations
  • OPDS options depend on each catalog provider

Who it suits

It suits general readers, heavy readers, library-goers, and students. It is also useful for people needing desktop or mobile access to varied publication formats.

Verdict

Thorium Reader covers a broad range of book, audio, and comic formats across desktop and mobile platforms. Its offline capability and reading controls are balanced by format-specific accessibility and DRM conditions.

Where Specifiction places it

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