ChatPDF is an AI chat tool that transforms PDF documents into interactive conversations, allowing users to ask questions and receive instant answers with page-specific citations.
ChatPDF is a popular document assistant that lets users upload textbook chapters, research publications, or manuals and query their contents inside a simple chat interface.
Instant Analysis: Upload a file and get three suggested questions matching the content immediately.
Source Citations: Answers include clickable reference links to the exact PDF page numbers.
✔ Extremely fast setup without logging in.
✔ Clean interface works well on mobile browsers.
✖ Free tier limits uploads to 120 pages/file.
| Plan | Type | Price | Details |
|---|---|---|---|
| Free | Freemium | Free | 2 PDFs/day, up to 120 pages per document. |
| Plus | Subscription | $5/month | Unlimited PDF uploads, up to 2,000 pages per file. |
Yes, uploads are stored securely in cloud hosting and can be deleted by the user anytime.
| Key Features |
CHATPDF
Active | 
NotebookLM (Google) | 
Deep Seek | 
Grammarly |
|---|---|---|---|---|
| Review Score | 9.2/10 | 9.7/10 | 9.6/10 | 9.5/10 |
| Pricing Model | $0-$19.99/month) | $0 - $249 | $20/mo | $12/month (billed annually |
| Free Plan | ✔ Yes | ✔ Yes | ✔ Yes | ✔ Yes |
| Starting Cost | Freemium | Free | Freemium | Freemium |
| Details Page | Active Page | Compare | Compare | Compare |
NotebookLM is Google's AI-powered research assistant that converts your documents into podcast-style audio discussions, video overviews, study guides, and interactive content with source-grounded responses.
DeepSeek is a powerful open-source Chinese-English large language model designed for reasoning, code generation, and multilingual AI tasks.
Grammarly is an AI-powered writing assistant that improves grammar, clarity, tone, and style across emails, documents, and web content.
Duolingo is a gamified language learning platform that uses AI and bite-sized lessons to teach over 40 languages effectively.
QuillBot is an AI writing assistant with paraphrasing, grammar checking, summarization, AI detection, plagiarism checking, humanizing, translation, citations, and writing apps.
Khanmigo is an AI-powered tutoring assistant by Khan Academy that helps students and teachers with learning, guidance, and feedback.
Speechify is an AI text-to-speech and voice productivity platform for listening to documents, PDFs, websites, emails, books, AI podcasts, voice typing, and voice AI assistant workflows.
Replit is an AI-powered cloud development platform for building, collaborating, deploying, and hosting apps in the browser with Replit Agent, workspaces, databases, and app publishing.
