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Sioyek vs MuPDF: catalog facts
Sioyek	MuPDF
Free Free and open source under the GPL. The developer accepts optional donations.	Free Free and open source under the AGPL. Commercial licensing is sold separately.
Windows, macOS, Linux	Windows, macOS, Linux, Android, iOS, Command line
Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library	Extremely fast and small, with accurate rendering The bundled mutool covers most scripted PDF manipulation
The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch	The viewer interface is deliberately minimal and keyboard-driven Commercial use of the library needs a paid licence from Artifex
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: AGPL-3.0
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.