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LibrumFBReader
Free

Free and open source.

 Freemium

The reader is free. Some format plugins and premium features are paid.

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS
  • Reader and library manager in one app
  • Runs on several desktop platforms
  • Same library and reading position across desktop and mobile
  • Reads custom OPDS catalogues as well as local files
  • Sync depends on the project's service
  • Smaller project than established readers like Calibre
  • Some features and formats need paid add-ons
  • The desktop builds lag the mobile apps
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 License not stated
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 October 2, 2026

Checked September 22, 2026

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