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PDF Tools vs Sioyek: catalog facts
PDF Tools	Sioyek
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL. The developer accepts optional donations.
Windows, macOS, Linux	Windows, macOS, Linux
Reads and annotates PDFs inside Emacs Search and link navigation	Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library
Only useful to Emacs users Requires building or installing the epdfinfo server	The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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