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FBReader vs Arianna: catalog facts
FBReader	Arianna
Freemium The reader is free. Some format plugins and premium features are paid.	Free Free and open source under the GPL-3.0, supported by KDE.
Windows, macOS, Linux, Android, iOS	Linux
Same library and reading position across desktop and mobile Reads custom OPDS catalogues as well as local files	Finds books on the computer automatically Sorts the library by category, genre and author
Some features and formats need paid add-ons The desktop builds lag the mobile apps	Reads EPUB files only Linux only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-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 24, 2026

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