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Alfa Ebooks Manager vs Calibre: catalog facts
Alfa Ebooks Manager	Calibre
Freemium Free download, with paid editions available to buy.	Free Free and open source, funded by donations.
Windows	Windows, macOS, Linux
Catalogs ebooks, paper books and audiobooks together Fetches book details from online sources	Converts between all the major ebook formats, including for Kindle Fetches metadata and covers from the internet automatically
Windows only Full features require a purchase	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
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 20, 2026

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