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Icecream Ebook Reader vs Calibre: catalog facts
Icecream Ebook Reader	Calibre
Freemium Free to use, with a paid PRO upgrade.	Free Free and open source, funded by donations.
Windows	Windows, macOS, Linux
Opens many formats, including comics Highlights and notes searchable by colour	Converts between all the major ebook formats, including for Kindle Fetches metadata and covers from the internet automatically
Windows only No support for DRM-protected books	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
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.