Compare software

Glasp vs Hypothesis: catalog facts
Glasp	Hypothesis
Free The extension and mobile apps are free.	Free Free for individuals. Institutional and LMS integrations are paid.
Android, iOS, Browser extension	Web, Browser extension
Highlights both web pages and PDFs Extensions for Chrome, Safari, Edge and Firefox	Annotations anchor to the text and survive page reflow Private, group and public annotation layers on the same document
Built around a social, hosted service AI features depend on the company's servers	Requires an account and stores annotations on their service Anchoring can fail if a page changes substantially
Downloadable app, 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.