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Paper Digest vs Undermind: catalog facts
Paper Digest	Undermind
Freemium Can be tried without signing in; full pricing is not described in the research.	Freemium Free sign-up, with paid and enterprise plans.
Web	Web
Literature review, question answering and claim verification in one place Search across papers, patents, grants and people	Reads full texts and figures, not only abstracts Follows citation trails to find related papers
Hosted service only Pricing for full use is not clearly stated	Hosted service that requires an account Focused on scientific literature rather than general search
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 24, 2026

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