Pick ChatPDF if
students and analysts who want Q&A on a PDF they already have.
Read the ChatPDF pageChatPDF vs SciSpace
Our take
Pick ChatPDF if students and analysts who want Q&A on a PDF they already have. Pick SciSpace if students and analysts who want a research agent with literature-review chips and will pay Premium or higher. Skip ChatPDF if people who need a citation graph (Connected Papers) or a paper-search agent (Elicit). Skip SciSpace if people who want a free paper reader (Semantic Scholar) or a systematic-review table (Elicit).
ChatPDF
signed-out PDF chat
Best for
ChatPDF Talk to one document in the browser without an account
SciSpace An AI research workspace
Free plan
ChatPDF $0 · to start a chat; history save wants Sign up. Exact Free page/question caps are not printed on the modal
SciSpace $0 · composer is usable signed-out; Teams toggle existed. No Free dollar row was on the paid-card screenshot. Do not invent one
Lowest paid
ChatPDF Plus (yearly) $6.42
SciSpace Premium (Yearly display) $12/mo yearly
Next step up
ChatPDF Plus (monthly) $15.99
SciSpace Advanced (Yearly display) $70/mo yearly
Coding agent
ChatPDF
SciSpace Advanced / Max
Runs where
ChatPDF
SciSpace Hosted
Watch out
ChatPDF Dollars live on the Plus modal
SciSpace Yearly vs monthly roughly doubles the Premium rate
Last checked
ChatPDF 2026-10-20 · chatpdf.com
SciSpace 2026-10-19 · scispace.com/pricing
Which one, then?
Pick SciSpace if
students and analysts who want a research agent with literature-review chips and will pay Premium or higher.
Read the SciSpace page