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Calibre vs Arianna: catalog facts
Calibre	Arianna
Free Free and open source, funded by donations.	Free Free and open source under the GPL-3.0, supported by KDE.
Windows, macOS, Linux	Linux
Converts between all the major ebook formats, including for Kindle Fetches metadata and covers from the internet automatically	Finds books on the computer automatically Sorts the library by category, genre and author
The interface is dense and has accumulated two decades of features It will not remove DRM; that requires third-party plug-ins with their own legal questions	Reads EPUB files only Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

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