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Paper Digest vs The Lens: catalog facts
Paper Digest	The Lens
Freemium Can be tried without signing in; full pricing is not described in the research.	Freemium Free to search, with paid subscriptions offered for some features.
Web	Web
Literature review, question answering and claim verification in one place Search across papers, patents, grants and people	Patents and scholarly works in one search Built-in charts and analysis of results
Hosted service only Pricing for full use is not clearly stated	Analysis of very large result sets can time out Some features require a subscription
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

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