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Sioyek vs Okular: catalog facts
Sioyek	Okular
Free Free and open source under the GPL. The developer accepts optional donations.	Free Free and open source under the GPL.
Windows, macOS, Linux	Windows, macOS, Linux
Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library	One viewer for a very wide range of document and comic formats Annotations are stored separately, so the original file is untouched
The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch	Pulls in KDE libraries on non-KDE desktops It is a viewer and annotator, not a PDF editor
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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