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Undermind vs SciSpace: catalog facts
Undermind	SciSpace
Freemium Free sign-up, with paid and enterprise plans.	Freemium Free sign-up, with paid plans for more usage and enterprise options.
Web	Web
Reads full texts and figures, not only abstracts Follows citation trails to find related papers	Search across more than 280 million papers Chat with PDF to explain difficult papers
Hosted service that requires an account Focused on scientific literature rather than general search	AI summaries of papers still need checking against the source Full features require a paid plan
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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