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Hypothesis vs Glasp: catalog facts
Hypothesis	Glasp
Free Free for individuals. Institutional and LMS integrations are paid.	Free The extension and mobile apps are free.
Web, Browser extension	Android, iOS, Browser extension
Annotations anchor to the text and survive page reflow Private, group and public annotation layers on the same document	Highlights both web pages and PDFs Extensions for Chrome, Safari, Edge and Firefox
Requires an account and stores annotations on their service Anchoring can fail if a page changes substantially	Built around a social, hosted service AI features depend on the company's servers
Browser extension	Downloadable app, Browser extension
Open source	Closed source
License: BSD-2-Clause	License not stated
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 September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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