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R Discovery vs Zendy: catalog facts
R Discovery	Zendy
Freemium Free to use, with paid plans listed on its pricing page.	Freemium Offers free access alongside lower-cost paid access to premium literature.
Android, iOS, Web, Browser extension	Android, iOS, Web
Personalized feed of new research papers Chat PDF and AI answers with references	Combines a scholarly library with AI search and summaries Chat assistant gives answers with references
Some features require a paid plan Closed source hosted service	Full access to premium content requires payment AI summaries should be checked against the papers themselves
Downloadable app, Web application, Browser extension	Downloadable app, Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	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.