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Calibre vs Clearview X: catalog facts
Calibre	Clearview X
Free Free and open source, funded by donations.	Paid Available as a paid app; the App Store listing does not state its price.
Windows, macOS, Linux	macOS
Converts between all the major ebook formats, including for Kindle Fetches metadata and covers from the internet automatically	Reads several ebook and comic formats Offers scrolling, page flipping, and single or double page layouts
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	Available for macOS
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 20, 2026	Official website Full listing and sources Checked October 8, 2026

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