Compare software

SciSpace vs Asta: catalog facts
SciSpace	Asta
Freemium Free sign-up, with paid plans for more usage and enterprise options.	Free Offered by Ai2 as a research project; no paid plans are listed.
Web	Web
Search across more than 280 million papers Chat with PDF to explain difficult papers	Large corpus of 108M+ abstracts and 12M+ full-text papers Built by Ai2, the institute behind Semantic Scholar
AI summaries of papers still need checking against the source Full features require a paid plan	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 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.