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Okular vs MuPDF: catalog facts
Okular	MuPDF
Free Free and open source under the GPL.	Free Free and open source under the AGPL. Commercial licensing is sold separately.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Command line
One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched	Extremely fast and small, with accurate rendering The bundled mutool covers most scripted PDF manipulation
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	The viewer interface is deliberately minimal and keyboard-driven Commercial use of the library needs a paid licence from Artifex
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-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 22, 2026	Official website Full listing and sources Checked September 22, 2026

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