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Highlights vs Sioyek: catalog facts
Highlights	Sioyek
Freemium Free to use, with advanced features in a Pro subscription that has a free trial.	Free Free and open source under the GPL. The developer accepts optional donations.
macOS, iOS	Windows, macOS, Linux
Exports annotations to Markdown and popular notes apps DOI lookup and citation metadata for papers	Opens a referenced figure, table or citation in an overlay without losing your place Searchable highlights, bookmarks and marks across your whole library
Apple platforms only Advanced features require a subscription	The last tagged release is from December 2022 macOS shows a quarantine warning that needs working around on first launch
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it 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.