Decision Support · Side-by-side

LlamaIndex vs PDF.ai. Side by side.

Compare pricing, strengths, and use cases so it is easier to pick the right fit.

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LlamaIndex

PDF.ai

Best overall

For non-technical users who just need to chat with PDFs, PDF.ai is the clear winner — it's simple, works in a browser, and requires zero setup. LlamaIndex is far more powerful but built for developers: you'll need to write code to use it. The single biggest difference is that PDF.ai is a ready-to-use app, while LlamaIndex is a developer framework you must build on top of.

LlamaIndex

Free tier with 10K credits/month; paid credit-based plans up to $5,000/mo #657 of 3,826 Web

PDF.ai

#772 of 3,826 Web

Scores at a glance

LlamaIndexPDF.aiPractical Versatility

Onboarding Ease

Ecosystem Fit

Market Value

Choose LlamaIndex if

You're a developer building a custom document search system for your company
You need to automatically process thousands of invoices or reports every day
You want to combine data from PDFs, databases, and web pages into one AI-powered assistant
You're comfortable writing code and want full control over how your AI works

Choose PDF.ai if

You're a student or researcher who needs to quickly find information in long PDFs
You review contracts or legal documents and want to compare clauses across files
You just want to upload a PDF and ask questions — no setup, no coding
You need accurate answers from scanned or handwritten documents without hassle

Key differences

LlamaIndex requires coding; PDF.ai is a ready-to-use web app
LlamaIndex has a generous free tier (10K credits/month); PDF.ai's free tier is very limited
LlamaIndex can process 50+ file types; PDF.ai focuses mainly on PDFs and images
LlamaIndex lets you build custom workflows; PDF.ai is a fixed chat interface
PDF.ai has a Chrome extension for browsing PDFs online; LlamaIndex has no mobile or browser extension
LlamaIndex is better for high-volume or automated processing; PDF.ai is better for one-off document questions

Facts side by side

	LlamaIndex	PDF.ai
Free plan
Mobile app
API access

LlamaIndex: strengths & weaknesses

Can handle almost any file type (PDF, Word, PowerPoint, images, CSV, JSON) and turn them into searchable data
Excellent at extracting tables, charts, and even handwriting from complex documents
Lets you build custom AI workflows — like automatically summarizing every new report that lands in a folder
Very active community and frequent updates
Requires coding knowledge (Python or Node.js) — not something you can just open and use
Setup involves installing software, getting API keys, and configuring databases
Documentation changes fast and can be confusing to follow
Free tier is generous (10K credits/month) but paid plans can get expensive if you process many pages

PDF.ai: strengths & weaknesses

Works right in your browser — upload a PDF and start asking questions immediately
Excellent at reading messy layouts, scanned documents, and handwritten notes
Can compare multiple documents at once (e.g., find differences between two contracts)
Shows you exactly which page it pulled each answer from, so you can verify
Free tier is very limited — you'll likely need to pay for regular use
Large files (over 500MB) can fail to index
No mobile app — you need a desktop browser or the Chrome extension
Pricing isn't clearly published, which makes it hard to know if it's worth it long-term

Common questions

Is LlamaIndex better than PDF.ai for extracting tables from PDFs?

Yes, LlamaIndex (via LlamaParse) is better for table extraction because it uses specialized agents to handle complex layouts. But you'll need to write code to use it. PDF.ai can also extract tables, but may struggle with very dense or irregular ones.

Can I use PDF.ai on my phone?

No, PDF.ai does not have a mobile app. You can use it on a phone's browser, but the experience is not optimized for small screens. LlamaIndex also has no mobile app.

Which tool is cheaper for a casual user who only needs to ask questions on a few PDFs per month?

PDF.ai's free tier is very limited, so you'd likely need to pay. LlamaIndex's free 10K credits (about 1,000 pages) is more generous, but only if you're willing to do the technical setup. For a non-technical casual user, neither is truly free — PDF.ai is simpler but costs money.

Can I use LlamaIndex without knowing how to code?

No. LlamaIndex is a developer framework that requires you to install software, write Python or JavaScript code, and manage API keys. If you're not technical, choose PDF.ai instead.

Which tool is better for comparing multiple legal contracts?

PDF.ai has a dedicated multi-document feature that lets you group related files and ask questions across them. LlamaIndex can do this too, but you'd need to build the comparison logic yourself. For most people, PDF.ai is the easier choice.

PDF.ai wins for everyday users who want a simple chat-with-PDF experience; LlamaIndex is for developers building custom document AI systems.

If you're not a developer, go with PDF.ai — it's simple, works in your browser, and gets the job done for everyday PDF questions. If you have coding skills and need to process lots of documents automatically, LlamaIndex is the more powerful choice. For most regular people, PDF.ai is the right pick.

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Detail pages: LlamaIndex · PDF.ai

LlamaIndex

PDF.ai

Free plan

Mobile app

API access