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Explainpaper vs SciSpace: catalog facts
Explainpaper	SciSpace
Freemium Free to try; paid plan details were not in the research.	Freemium Free sign-up, with paid plans for more usage and enterprise options.
Web	Web
Explains any highlighted passage in context Lets you ask questions about the paper	Search across more than 280 million papers Chat with PDF to explain difficult papers
Papers are uploaded to an online service AI explanations can be wrong and need checking	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 23, 2026	Official website Full listing and sources Checked September 23, 2026

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