Second Brain AI 🧠

Your Personal AI-Powered Knowledge Intelligence System
Notion + Obsidian + ChatGPT, but trained exclusively on YOUR data

🚀 Quick Demo

*(Live AI Intelligence Interface Preview)*

✨ Core Features

Feature	Status	Description
🧠 Universal Capture	🔄 MVP	Notes, PDFs, articles, YouTube (via Chrome Extension)
🤖 AI Processing	✅ Live	Auto-summaries, entity extraction, and smart tagging
🌐 Knowledge Graph	🔄 Beta	Visualizing connections between your ideas
💬 AI Chat	✅ Live	Contextual queries limited strictly to your private data
🔍 Semantic Search	🔄 Coming	Natural language search based on meaning, not just keywords
📊 Daily Insights	🔄 Coming	Personalized learning patterns and digest

🎯 Product Vision

Second Brain AI is your external brain that:

• 📥 Captures everything you consume across the web.
• 🧠 Organizes data into a connected, searchable knowledge graph.
• 🤖 Answers your questions using ONLY your verified data.
• 💡 Discovers hidden connections and generates new insights.

Real Examples:

• "What do I know about AI startups?"
• "Connect my React and TypeScript notes"
• "Summarize everything I've saved about productivity"

🛠 Tech Stack

• Frontend: Next.js 14 + React 18 + Tailwind CSS
• Backend: Node.js + Express.js
• Database: MongoDB + Neo4j Graph DB
• AI/ML: OpenAI GPT-4 + Embeddings (Pinecone)
• Storage: AWS S3
• Extension: Chrome Extension API
• Deployment: Vercel + Railway

📱 Quick Start

Prerequisites

Node.js 18+          # nvm install 18
MongoDB 7.0+         # brew install mongodb-community
OpenAI API Key       # platform.openai.com/api-keys

🚀 3-Minute Setup

# Clone & Install
git clone https://github.com/hariom123-dev/Luminary-2nd-Brain-.git
cd luminary-2nd-brain

# Installation
npm install

# Setup Environment
cp .env.example .env
# Add your OPENAI_API_KEY and MONGODB_URI

Local URLs

• Main App: http://localhost:3000

Environment Variables

OPENAI_API_KEY=sk-...
MONGODB_URI=mongodb://localhost:27017/secondbrain
NEXTAUTH_SECRET=your-super-secret-key
NEXTAUTH_URL=http://localhost:3000

🏗️ System Architecture

graph TB
    User[👤 User] 
    CE[🔌 Chrome Extension]
    Web[🌐 Web App]
    
    User --> CE
    User --> Web
    
    CE --> Capture[📥 Universal Capture]
    Web --> Capture
    
    Capture --> AI[🤖 AI Engine]
    AI -->|"Summary<br>Entities<br>Tags"| Processed[📄 Processed Data]
    
    Processed --> Mongo[(💾 MongoDB<br/>Notes)]
    Processed --> Neo4j[(🕸️ Neo4j<br/>Knowledge Graph)]
    Processed --> Pinecone[(🔍 Vector DB<br/>Embeddings)]
    
    Web --> Query[💬 AI Query]
    Query --> RAG[📚 RAG Pipeline]
    RAG --> Mongo
    RAG --> Neo4j  
    RAG --> Pinecone
    RAG --> OpenAI[🧠 OpenAI GPT-4]
    OpenAI -->|"Sources + Answer"| Answer[✅ Response]

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🎨 User Experience Flows

1. Lightning Save ✨ (15 seconds)

1. Install Chrome Extension.
2. Click "Save to Brain" on any web page.
3. AI processes the content automatically in the background.

2. Chat Your Knowledge 🗣️

1. Type: "What do I know about React hooks?"
2. AI scans ONLY your data.
3. Receive a concise answer with source citations and related connections.

3. Graph Exploration 🌐

1. Open the Knowledge Graph view.
2. Click the "React" node.
3. Discover related topics: Hooks → State → Performance → Optimization.

📊 Development Roadmap

Phase	Features	Timeline	Status
MVP v0.1	Notes + AI Chat + RAG	2 weeks	✅ Complete
v1.0	Knowledge Graph + Chrome Ext	4 weeks	🔄 60%
v1.1	Semantic Search + Insights	Q1 2024	📅 Planned
v2.0	Mobile + Voice + Teams	Q2 2024	🔮 Future

💎 What's Live Now (MVP)

• ✅ Note capture (Text + PDFs)
• ✅ AI summaries & entity extraction
• ✅ RAG Chat (Exclusive to your data)
• ✅ Source citations
• ✅ Responsive UI with Dark Mode
• ✅ User Authentication (NextAuth)

🔮 Planned Features

• Chrome Extension (1-click save)
• Full Knowledge Graph UI
• YouTube transcript processing
• Voice-to-text notes
• Mobile apps (React Native)
• Team collaboration
• Export to Obsidian/Markdown
• Self-hosting option

⚠️ Key Challenges Solved

Challenge	Our Solution
AI Costs	Intelligent caching + batch processing pipelines
Data Privacy	100% user-isolated data, strictly no model training on user info
Graph Scale	Neo4j + progressive loading for smooth visualization
Query Speed	Hybrid search (vector embeddings + graph traversal)

🔐 Privacy & Security

• ✅ YOUR data stays YOURS.
• ✅ No global model training on private notes.
• ✅ E2E encryption (v2.0).
• ✅ Local-first architecture (optional).
• ✅ Full data export and account deletion.

💰 Business Model

Plan	Storage	Queries	Features
Free	100 notes	10/day	Basic AI features
Pro ($9/mo)	Unlimited	Unlimited	GPT-4, Graph UI, Extension
Teams ($29/mo)	Unlimited	Unlimited	Shared knowledge bases

🤝 Contributing

1. Fork the repo.
2. Clone locally.
3. Create a feature branch: git checkout -b feat/amazing-feature.
4. Commit your changes: git commit -m 'feat: add amazing feature'.
5. Push & Open a Pull Request.

📄 License

This project is licensed under the MIT License — use it for any purpose!

🙌 Acknowledgments

Built with ❤️ and these amazing tools:

🚀 Get Involved

• ⭐ Star this repo if you find it useful!
• 🐛 Bug? Open an issue.
• 💡 Idea? Start a discussion.

🧠 Second Brain AI
Remember everything. Discover anything. Build your intelligence.

"The best way to predict the future is to invent it."

— Alan Kay