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OpenRead vs SciSpace: catalog facts
OpenRead	SciSpace
Freemium Free tier available, with a paid Pro plan.	Freemium Free sign-up, with paid plans for more usage and enterprise options.
Web	Web
Search across more than 300 million papers Compare several papers to spot agreements and contradictions	Search across more than 280 million papers Chat with PDF to explain difficult papers
Web only, no desktop app Advanced features sit behind the Pro plan	AI summaries of papers still need checking against the source Full features require a paid plan
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 23, 2026

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