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Sioyek vs Scrolex: catalog facts
Sioyek	Scrolex
Free Free and open source under the GPL. The developer accepts optional donations.	Free Free and open source under the AGPL version 3 or later.
Windows, macOS, Linux	Linux
Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library	Horizontal page layout suited to wide screens Optimized for HiDPI displays
The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch	Viewer only, with no editing or annotation tools mentioned Small single-developer project
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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