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Xreader vs Okular: catalog facts
Xreader	Okular
Free Free and open source under the GPL 2.0.	Free Free and open source under the GPL.
Linux	Windows, macOS, Linux
Opens many formats including DjVu, XPS and comic archives Actively maintained by the Linux Mint team	One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched
Linux only Some formats depend on optional backend libraries being installed	Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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