Compare software

Diigo vs Hypothesis: catalog facts
Diigo	Hypothesis
Freemium Free to use, with premium features such as archived web pages.	Free Free for individuals. Institutional and LMS integrations are paid.
Web, Browser extension	Web, Browser extension
Highlights and sticky notes on web pages and PDFs Tags and a personal library for saved pages	Annotations anchor to the text and survive page reflow Private, group and public annotation layers on the same document
Page archiving requires a premium plan Closed source hosted service	Requires an account and stores annotations on their service Anchoring can fail if a page changes substantially
Web application, Browser extension	Browser extension
Closed source	Open source
License not stated	License: BSD-2-Clause
Not stated if an account is needed	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 September 22, 2026

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