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Diigo vs Web Highlights: catalog facts
Diigo	Web Highlights
Freemium Free to use, with premium features such as archived web pages.	Free The extension is free to install and use without signing up.
Web, Browser extension	Browser extension
Highlights and sticky notes on web pages and PDFs Tags and a personal library for saved pages	Highlights persist on web pages and PDFs after reload Notes and tags for organising research
Page archiving requires a premium plan Closed source hosted service	Proprietary extension Notes live in the extension's own app rather than plain files
Web application, Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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