Compare tools
Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
⇄ Comparison dimension — pick the market you're actually shopping in
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ChatPDF
✓ verifiedFreemium
Popular tool to chat with PDFs and other documents, giving summaries and cited answers, with a free daily tier and no-signup start.
1.8M visits/mo43K saves
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Recall
✓ verifiedFreemium
AI knowledge base that saves, summarizes and connects articles, videos, podcasts and PDFs into a graph you can chat with.
152K visits/mo1.5K saves
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CopilotKit
✓ verifiedFreemium
Open-source React/Angular SDK and platform for embedding agentic, generative-UI copilots into apps, Slack and Teams.
170K visits/mo
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PDF.ai
✓ verifiedFreemium
Well-known chat-with-PDF tool for summarizing and extracting; strong traffic.
484K visits/mo2.7K saves
Pricing
No public pricing
Free: $0 (10 AI summaries/mo)
Plus: $10/mo billed yearly (unlimited summaries)
Max: $38/mo billed yearly (bulk actions, model choice)
Developer: $0 (1 seat, free forever, 200 threads)
Pro: $39/developer/mo (up to 5 seats, 5,000 threads)
Team: $500/mo (5 seats, 25,000 threads)
No public pricing
Hobby: $0
Pro: $10/mo
Ultimate: $20/user/mo
Enterprise: $30/user/mo
Core features
- ✦Chat with PDFs, Word, PowerPoint and text files
- ✦Summaries with cited sources
- ✦Multi-file chats via folders
- ✦Any-language upload and chat
- ✦Extra tools: AI writer, detector, flashcards, slides
- ✦No-signup quick start
- ✦One-click saving of articles, videos, podcasts, PDFs
- ✦AI summaries of saved content
- ✦Automatic tagging and knowledge-graph linking
- ✦Chat with your knowledge using GPT, Claude or Gemini
- ✦Spaced-repetition quizzes
- ✦Browser extension, web and mobile apps; API/MCP access
- ✦React and Angular frontend SDKs
- ✦Agent-rendered generative UI
- ✦AG-UI agent-user interaction protocol
- ✦Connectors for LangChain and other frameworks
- ✦Pre-built customizable chat/sidebar components
- ✦Slack and Teams integrations
- ✦Thread and state persistence
- ✦AI Chatbot powered by ChatGPT, GPT-4o & Gemini
- ✦Available on multiple platforms (Web, iPhone, Apple Watch, macOS, Android)
- ✦Humanlike responses
- ✦Homework assistance
- ✦Proofreading
- ✦AI Writing Assistant
- ✦Chat with PDF documents
- ✦Summarize PDF content
- ✦Extract information from PDFs
- ✦Source citation for answers
- ✦OCR support
- ✦AI Agents for document analysis
- ✦Capture & Ask feature
- ✦Chatbot widget (add-on)
Use cases
- →Understand research papers
- →Study and homework help
- →Review contracts and reports
- →Translate and summarize documents
- →Building a personal 'second brain'
- →Summarizing long content to save time
- →Chatting with your own saved knowledge
- →Retaining what you read via spaced repetition
- →Adding an AI assistant to a SaaS product
- →Building agents that render interactive UI
- →Deploying copilots across Slack and Teams
- →Connecting existing agents to a frontend
- →Get help with homework, from essays and compositions to math questions.
- →Proofread written work to create professional-grade documents.
- →Get personalized help with any writing project, from essays to social media posts.
- →Act as a travel agent.
- →Analyzing legal documents
- →Summarizing financial reports
- →Extracting key information from books
- →Reviewing scientific papers
- →Understanding user manuals
- →Creating employee training materials
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