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Explainpaper vs ChatPDF: catalog facts
Explainpaper	ChatPDF
Freemium Free to try; paid plan details were not in the research.	Freemium Free to use, with a paid Plus upgrade.
Web	Web
Explains any highlighted passage in context Lets you ask questions about the paper	Answers cite the passages they come from Folders for chatting across several files
Papers are uploaded to an online service AI explanations can be wrong and need checking	Documents are processed on a remote service Chat history is only saved after signing up
Web application	Downloadable app, 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 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.