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Koodo ReaderKOReader
Free

Free and open source under the AGPL-3.0.

 Free

Free and open source under the AGPL 3.0.

Windows, macOS, Linux, Android, iOS, Web Linux, Android
  • Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX
  • Syncs through storage you already control rather than a vendor cloud
  • Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware
  • Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT
  • 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
  • Installing on a locked e-reader means jailbreaking it first, at your own risk
  • The settings menus are deep and not self-explanatory
Downloadable app, Web application Downloadable app
Open source Open source
License: AGPL-3.0 License: AGPL-3.0
No account needed No account needed
Works offline Works offline

Checked September 20, 2026

Checked September 21, 2026

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