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Asta vs Paperguide: catalog facts
Asta	Paperguide
Free Offered by Ai2 as a research project; no paid plans are listed.	Freemium Free to start, with paid plans and demos for teams.
Web	Web
Large corpus of 108M+ abstracts and 12M+ full-text papers Built by Ai2, the institute behind Semantic Scholar	Cited answers from a large paper index Imports libraries from Zotero and Mendeley
Web only Little detail about features is available on the homepage	Web only, with no offline use AI answers still need checking against the sources
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 26, 2026

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