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KOReader vs Readest: catalog facts
KOReader	Readest
Free Free and open source under the AGPL 3.0.	Freemium The app is free and open source under the AGPL. The optional cloud sync service has paid…
Linux, Android	Windows, macOS, Linux, Android, Web, iOS
Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT	Reads EPUB, PDF, MOBI, AZW3, FB2, CBZ, TXT and Markdown in one app The same reader on macOS, Windows, Linux, Android, iOS and the web
Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory	Cloud sync is a hosted service with paid tiers, not purely local A young project, so features and stability are still moving
Downloadable app	Downloadable app, Web application
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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