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Sioyek vs Highlights: catalog facts
Sioyek	Highlights
Free Free and open source under the GPL. The developer accepts optional donations.	Freemium Free to use, with advanced features in a Pro subscription that has a free trial.
Windows, macOS, Linux	macOS, iOS
Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library	Exports annotations to Markdown and popular notes apps DOI lookup and citation metadata for papers
The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch	Apple platforms only Advanced features require a subscription
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
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 24, 2026

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