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Asta vs Undermind: catalog facts
Asta	Undermind
Free Offered by Ai2 as a research project; no paid plans are listed.	Freemium Free sign-up, with paid and enterprise plans.
Web	Web
Large corpus of 108M+ abstracts and 12M+ full-text papers Built by Ai2, the institute behind Semantic Scholar	Reads full texts and figures, not only abstracts Follows citation trails to find related papers
Web only Little detail about features is available on the homepage	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
Not stated if an account is 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.