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Liner vs Diigo: catalog facts
Liner	Diigo
Freemium Free browser extension with AI features that may have usage limits.	Freemium Free to use, with premium features such as archived web pages.
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	Highlights and sticky notes on web pages and PDFs Tags and a personal library for saved pages
AI summary features depend on cloud processing of the content you're reading Free tier likely limits how much AI functionality is available	Page archiving requires a premium plan Closed source hosted service
Browser extension	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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.