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ProseReaderKoodo Reader
Free

Free and open source under the GPL-3.0.

 Free

Free and open source under the AGPL-3.0.

Android Windows, macOS, Linux, Android, iOS, Web
  • Actively developed with frequent releases
  • Available on F-Droid
  • Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX
  • Syncs through storage you already control rather than a vendor cloud
  • Focused on EPUB files
  • Small user base and community
  • It reads DRM-free files only; books bought from a store with DRM will not open
  • Sync depends on whatever storage you configure, so the setup is on you
Downloadable app Downloadable app, Web application
Open source Open source
License: GPL-3.0 License: AGPL-3.0
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 2, 2026

Checked September 20, 2026

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