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FoliateThorium Reader
Free

Free and open source, with no paid edition.

 Free

The open-source software is available without a license fee. Hosting, hardware and…

Linux Windows, macOS, Linux
  • Opens EPUB, Mobipocket, Kindle, FB2, CBZ and PDF
  • Annotations and progress are plain JSON files you can sync however you want
  • Supports library imports, bookmarks and adjustable reading layouts.
  • Linux only; there is no Windows or macOS build
  • Needs recent GTK4, libadwaita and WebKitGTK, which older distributions may not have
  • Format and protection support depend on the book being opened.
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: BSD-3-Clause
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 20, 2026

Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.