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Okular vs Xreader: catalog facts
Okular	Xreader
Free Free and open source under the GPL.	Free Free and open source under the GPL 2.0.
Windows, macOS, Linux	Linux
One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched	Opens many formats including DjVu, XPS and comic archives Actively maintained by the Linux Mint team
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Linux only Some formats depend on optional backend libraries being installed
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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