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Paper Digest vs Zendy: catalog facts
Paper Digest	Zendy
Freemium Can be tried without signing in; full pricing is not described in the research.	Freemium Offers free access alongside lower-cost paid access to premium literature.
Web	Android, iOS, Web
Literature review, question answering and claim verification in one place Search across papers, patents, grants and people	Combines a scholarly library with AI search and summaries Chat assistant gives answers with references
Hosted service only Pricing for full use is not clearly stated	Full access to premium content requires payment AI summaries should be checked against the papers themselves
Web application	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 1, 2026

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