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Okular vs Scrolex: catalog facts
Okular	Scrolex
Free Free and open source under the GPL.	Free Free and open source under the AGPL version 3 or later.
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	Horizontal page layout suited to wide screens Optimized for HiDPI displays
Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor	Viewer only, with no editing or annotation tools mentioned Small single-developer project
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-3.0-or-later
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.