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Okular vs PDF Annotator: catalog facts
Okular	PDF Annotator
Free Free and open source under the GPL.	Paid Paid software with a free trial.
Windows, macOS, Linux	Windows
One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched	Handwritten annotations with pen and touch on tablet PCs Annotations saved into the original PDF and viewable anywhere
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Windows only Paid after the trial
Downloadable app	Downloadable app
Open source	Closed 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 October 1, 2026

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