Decision Support · Side-by-side
Compare pricing, strengths, and use cases so it is easier to pick the right fit.
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ChatPDF wins for quick, casual PDF chats on a budget—it's dead simple and free. Petal wins for serious researchers who need accurate citations and multi-document synthesis. The single biggest difference: ChatPDF is a lightweight chat tool; Petal is a full document management system with Zotero sync.
ChatPDF
Petal
Scores at a glance
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Key differences
Facts side by side
| ChatPDF | Petal | |
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| Free plan | ||
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Common questions
Yes, for a single assignment. ChatPDF is faster to start and free. But if you're managing a semester's worth of readings, Petal's library search saves more time.
Both are web-only—no native mobile app. You can use them in a mobile browser, but the experience is clunky. ChatPDF's interface is simpler and works better on a small screen.
Petal. It's built for academic rigor and has the highest citation accuracy in its class. ChatPDF gives page numbers but can miss or misattribute sources in complex documents.
ChatPDF's free tier is generous enough for most people. Petal's free tier is very limited—you'll likely need the $2.55/month plan if you have more than a handful of documents.
ChatPDF limits files to 32MB on Plus, so a large book may not fit. Petal doesn't have a strict file size limit but storage space on the free plan is small. Both can handle long documents if you have the right plan.
ChatPDF is the fastest way to chat with a single PDF; Petal is the smarter choice for anyone who lives in research papers.
If you just need to ask a PDF a few questions and move on, start with ChatPDF—it's free and takes 10 seconds. If you're doing serious research, writing a paper, or managing a library of documents, invest the time in Petal; its accuracy and multi-document features will save you hours.
