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Diigo vs Kami: catalog facts
Diigo	Kami
Freemium Free to use, with premium features such as archived web pages.	Freemium Free trial available; school and district plans are sold through sales.
Web, Browser extension	Web
Highlights and sticky notes on web pages and PDFs Tags and a personal library for saved pages	Annotation tools built for classroom use Accessibility and translation features for diverse learners
Page archiving requires a premium plan Closed source hosted service	Aimed at schools rather than general PDF users Full plans require contacting sales
Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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