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Calibre vs Alfa Ebooks Manager: catalog facts
Calibre	Alfa Ebooks Manager
Free Free and open source, funded by donations.	Freemium Free download, with paid editions available to buy.
Windows, macOS, Linux	Windows
Converts between all the major ebook formats, including for Kindle Fetches metadata and covers from the internet automatically	Catalogs ebooks, paper books and audiobooks together Fetches book details from online sources
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	Windows only Full features require a purchase
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	No account 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 24, 2026

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