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Scholar Inbox vs R Discovery: catalog facts
Scholar Inbox	R Discovery
Free Free to use.	Freemium Free to use, with paid plans listed on its pricing page.
Web	Android, iOS, Web, Browser extension
Personalized recommendations rather than a raw feed Daily coverage of arXiv, bioRxiv, medRxiv and ChemRxiv	Personalized feed of new research papers Chat PDF and AI answers with references
Limited to the preprint servers and proceedings it indexes Recommendations need time to learn your interests	Some features require a paid plan Closed source hosted service
Web application	Downloadable app, 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	Not stated if it works offline
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.