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Okular vs Atril: catalog facts
Okular	Atril
Free Free and open source under the GPL.	Free Free and open source under the GPL.
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 PDF, PostScript, DjVu, DVI, XPS and comic archives Lightweight with a traditional interface
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Viewing only, with no PDF editing Designed for the MATE desktop on Linux
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 23, 2026

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