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Semantic Scholar vs Asta: catalog facts
Semantic Scholar	Asta
Free Free to use in the browser.	Free Offered by Ai2 as a research project; no paid plans are listed.
Web, Browser extension	Web
Index of more than 238 million papers across all fields of science Free to search without cost	Large corpus of 108M+ abstracts and 12M+ full-text papers Built by Ai2, the institute behind Semantic Scholar
Semantic Reader is in beta and only available for select papers Web only, with no offline use	Web only Little detail about features is available on the homepage
Web application, Browser extension	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 26, 2026

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