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Scholar Inbox vs Paper Digest: catalog facts
Scholar Inbox	Paper Digest
Free Free to use.	Freemium Can be tried without signing in; full pricing is not described in the research.
Web	Web
Personalized recommendations rather than a raw feed Daily coverage of arXiv, bioRxiv, medRxiv and ChemRxiv	Literature review, question answering and claim verification in one place Search across papers, patents, grants and people
Limited to the preprint servers and proceedings it indexes Recommendations need time to learn your interests	Hosted service only Pricing for full use is not clearly stated
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 26, 2026

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