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alphaXiv vs Semantic Scholar: catalog facts
alphaXiv	Semantic Scholar
Free The homepage lists no prices; signing up adds following and discussion.	Free Free to use in the browser.
Web, Browser extension	Web, Browser extension
Trending papers with summaries and discussion Follow specific authors and organizations	Index of more than 238 million papers across all fields of science Free to search without cost
Focused on arXiv papers Discussion features require an account	Semantic Reader is in beta and only available for select papers Web only, with no offline use
Web application, Browser extension	Web application, Browser extension
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 October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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