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Okular vs PDF Tools: catalog facts
Okular	PDF Tools
Free Free and open source under the GPL.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux	Windows, macOS, Linux
One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched	Reads and annotates PDFs inside Emacs Search and link navigation
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Only useful to Emacs users Requires building or installing the epdfinfo server
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-3.0
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.