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Koodo Reader vs FBReader: catalog facts
Koodo Reader	FBReader
Free Free and open source under the AGPL-3.0.	Freemium The reader is free. Some format plugins and premium features are paid.
Windows, macOS, Linux, Android, iOS, Web	Windows, macOS, Linux, Android, iOS
Over fifteen formats including EPUB, PDF, MOBI, AZW3, comic archives and DOCX Syncs through storage you already control rather than a vendor cloud	Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files
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	Some features and formats need paid add-ons The desktop builds lag the mobile apps
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 22, 2026

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