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Hypothesis vs Liner: catalog facts
Hypothesis	Liner
Free Free for individuals. Institutional and LMS integrations are paid.	Freemium Free browser extension with AI features that may have usage limits.
Web, Browser extension	Browser extension
Annotations anchor to the text and survive page reflow Private, group and public annotation layers on the same document	Combines highlighting, bookmarking and AI summarization in one extension Works across webpages, PDFs and videos rather than just plain text
Requires an account and stores annotations on their service Anchoring can fail if a page changes substantially	AI summary features depend on cloud processing of the content you're reading Free tier likely limits how much AI functionality is available
Browser extension	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 22, 2026

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