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R Discovery vs Scholar Inbox: catalog facts
R Discovery	Scholar Inbox
Freemium Free to use, with paid plans listed on its pricing page.	Free Free to use.
Android, iOS, Web, Browser extension	Web
Personalized feed of new research papers Chat PDF and AI answers with references	Personalized recommendations rather than a raw feed Daily coverage of arXiv, bioRxiv, medRxiv and ChemRxiv
Some features require a paid plan Closed source hosted service	Limited to the preprint servers and proceedings it indexes Recommendations need time to learn your interests
Downloadable app, 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
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.