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Okular vs Papers: catalog facts
Okular	Papers
Free Free and open source under the GPL.	Free Free GNOME app, supported by donations to the GNOME Foundation.
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	Annotation and highlighting of PDFs Opens DjVu, TIFF and comic book archives
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Linux only No full PDF text editing
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
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.