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Arianna vs FBReader: catalog facts
Arianna	FBReader
Free Free and open source under the GPL-3.0, supported by KDE.	Freemium The reader is free. Some format plugins and premium features are paid.
Linux	Windows, macOS, Linux, Android, iOS
Finds books on the computer automatically Sorts the library by category, genre and author	Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files
Reads EPUB files only Linux only	Some features and formats need paid add-ons The desktop builds lag the mobile apps
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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