Koodo Reader vs Thorium Reader
A side-by-side comparison of two self-hosted e-books & media library options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Koodo Reader | Thorium Reader |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 97 · Excellent | 87 · Excellent |
| Category | E-books & Media Library | E-books & Media Library |
| License | AGPL-3.0 | BSD-3-Clause |
| Language | JavaScript | TypeScript |
| Setup difficulty | Easy | Easy |
| Min. RAM | 256 MB | 512 MB |
| Deployment | docker, binary | binary, source |
| GitHub stars | ★ 28,282 | ★ 2,879 |
| First released | 2020 | 2019 |
| Replaces | Calibre, Apple Books | Adobe Digital Editions, Apple Books |
What are Koodo Reader and Thorium Reader?
Koodo Reader
Koodo Reader is an open-source ebook reader supporting EPUB, PDF, MOBI, and many other formats, with annotations, highlights, and a personal library. It can be self-hosted as a web app to read books from any browser.
- Supports many ebook formats
- Annotations and highlights
- Self-hostable web reader
- Cross-platform desktop apps
Thorium Reader
Thorium Reader is an open-source desktop ebook reader by EDRLab supporting EPUB, audiobooks, PDF, and DAISY formats. It emphasizes accessibility and standards compliance for offline reading.
- EPUB and audiobook support
- Strong accessibility features
- DAISY format support
- Cross-platform desktop app
Koodo Reader vs Thorium Reader: key differences
Koodo Reader is written in JavaScript, while Thorium Reader is built with TypeScript. Licensing differs — AGPL-3.0 for Koodo Reader versus BSD-3-Clause for Thorium Reader. Koodo Reader is the lighter option, starting around 256 MB of RAM against 512 MB for Thorium Reader. Koodo Reader has the considerably larger community, at 28,282 GitHub stars versus 2,879. Koodo Reader lists first-class Docker deployment; Thorium Reader does not.
Why pick each one
Choose Koodo Reader if…
- Many formats supported
- Rich annotation tools
- Works fully offline
Watch out for
- Sync needs manual setup
- Electron app weight
Choose Thorium Reader if…
- Released under the BSD-3-Clause license
- Easy to set up — beginner-friendly
- Active community (2.9k GitHub stars)
- Written in TypeScript
Frequently asked questions
Is Koodo Reader or Thorium Reader better?
Neither is universally better. Koodo Reader has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Koodo Reader and Thorium Reader free and open-source?
Yes. Koodo Reader is licensed under AGPL-3.0 and Thorium Reader under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Koodo Reader and Thorium Reader with Docker?
Koodo Reader: yes. Thorium Reader: check the project docs for container support.
Which is lighter on resources, Koodo Reader or Thorium Reader?
Koodo Reader has the smaller minimum footprint at 256 MB of RAM, compared to about 512 MB for Thorium Reader. Real-world usage depends on library size, user count, and enabled features.