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

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