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