# Thorium Reader (open-source education and reference app)

> Thorium Reader is a free, open-source education and reference app for Windows, macOS and Linux. A cross platform desktop reading app, based on the Readium Desktop toolkit. It has 2,896 GitHub stars and is released under the BSD-3-Clause license. Its source code is on GitHub at edrlab/thorium-reader.

Thorium Reader is an easy to use EPUB reading application for Windows 10/10S, MacOS and Linux. After importing e-books from a directory or OPDS feed, you'll be able to read on any screen size, customize layout settings, navigate via the table of contents or page list, set bookmarks... A great care is taken to ensure the accessibility of the application for visual impaired people using NVDA, JAWS or Narrator.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/edrlab/thorium-reader |
| Platforms | Linux, macOS, Windows |
| Interface | desktop GUI |
| GitHub stars | 2,896 |
| License | BSD-3-Clause (open source) |
| Replaces | n/a |
| Language | TypeScript |
| Website | https://www.edrlab.org/software/thorium-reader/ |
| Official | no |
| Category | Education, flashcards & reference |
| Latest release | v3.5.1 (Sep 2, 2026) |
| Last commit | Oct 7, 2026 |

## Install

Download a build for your system from the project's releases (https://github.com/edrlab/thorium-reader/releases) or website, or build it from source by following the README.

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