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Neat Reader vs Librum: catalog facts
Neat Reader	Librum
Freemium Free to use, with a Premium plan that has a seven-day free trial.	Free Free and open source.
Windows, macOS, Android, iOS, Web	Windows, macOS, Linux
Apps for desktop, mobile and the web Syncs books, notes and progress through the cloud	Reader and library manager in one app Runs on several desktop platforms
EPUB 3 support is not complete Some features need the paid Premium plan	Sync depends on the project's service Smaller project than established readers like Calibre
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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