4.8
AI that only answers from the sources you gave it.
Ask a PDF questions with citations back to the page.
Best for a quick chat with one paper or a slide deck you already have
Reviewed 16 September 2026 · Prices checked the same day
4.5
16K reviews
ChatPDF lets you upload a PDF (and now Word, PowerPoint, and text) and ask questions with clickable citations. Free allows 2 documents a day without an account. Plus is listed around $19.99 a month or $119.99 a year ($9.99 a month effective) on 2026 pricing write-ups; the homepage itself only says Plus is unlimited. Confirm at checkout. Prices checked 21 September 2026.
It will summarise what is on the page. It will not sit the exam. For a closed set of course files with Audio Overviews, NotebookLM is the fuller free tool.
Pricing
freemium
Plus about $19.99/mo or $119.99/yr (confirm at checkout)
Free version
2 documents per day; account unlocks history
Platforms
Web
The fastest 'what does this paper say' tab. Weak as a semester workspace. Use NotebookLM or Studycamp when the files have to stay together.
Checked 2026-09-21
| Model | Freemium |
|---|---|
| What free actually includes | 2 documents per day; account unlocks history |
| Cheapest paid tier | Plus about $19.99/mo or $119.99/yr (confirm at checkout) |
| Student pricing | None published |
Links from StudyApps include ref=studyapps.
2 documents per day; account unlocks history Checked 16 September 2026.
Cheapest paid plan: Plus about $19.99/mo or $119.99/yr (confirm at checkout). Prices checked 16 September 2026.
A quick chat with one paper or a slide deck you already have
Two free documents a day is a reading list, not a module
AI that only answers from the sources you gave it.
Turn your notes and slides into flashcards, quizzes, and answers in one workspace.
Long-context chat that is unusually careful with a uploaded PDF.