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Diigo vs Liner: catalog facts
Diigo	Liner
Freemium Free to use, with premium features such as archived web pages.	Freemium Free browser extension with AI features that may have usage limits.
Web, Browser extension	Browser extension
Highlights and sticky notes on web pages and PDFs Tags and a personal library for saved pages	Combines highlighting, bookmarking and AI summarization in one extension Works across webpages, PDFs and videos rather than just plain text
Page archiving requires a premium plan Closed source hosted service	AI summary features depend on cloud processing of the content you're reading Free tier likely limits how much AI functionality is available
Web application, Browser extension	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 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.