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Thorium ReaderLibrum
Free

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

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux
  • Supports library imports, bookmarks and adjustable reading layouts.
  • Reader and library manager in one app
  • Runs on several desktop platforms
  • Format and protection support depend on the book being opened.
  • Sync depends on the project's service
  • Smaller project than established readers like Calibre
Downloadable app Downloadable app
Open source Open source
License: BSD-3-Clause License: GPL-3.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked October 2, 2026

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