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

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