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Paperguide vs Asta: catalog facts
Paperguide	Asta
Freemium Free to start, with paid plans and demos for teams.	Free Offered by Ai2 as a research project; no paid plans are listed.
Web	Web
Cited answers from a large paper index Imports libraries from Zotero and Mendeley	Large corpus of 108M+ abstracts and 12M+ full-text papers Built by Ai2, the institute behind Semantic Scholar
Web only, with no offline use AI answers still need checking against the sources	Web only Little detail about features is available on the homepage
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is 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.