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R Discovery vs alphaXiv: catalog facts
R Discovery	alphaXiv
Freemium Free to use, with paid plans listed on its pricing page.	Free The homepage lists no prices; signing up adds following and discussion.
Android, iOS, Web, Browser extension	Web, Browser extension
Personalized feed of new research papers Chat PDF and AI answers with references	Trending papers with summaries and discussion Follow specific authors and organizations
Some features require a paid plan Closed source hosted service	Focused on arXiv papers Discussion features require an account
Downloadable app, 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
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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