Lekha

AI-powered collaborative document editor with real-time presence, data visualization, and intelligent commands.

Demo

Features

Core

• Real-time collaboration with live cursors and comments
• Rich text editing with tables, images, code blocks, and formatting
• Document templates and organization-based access

AI Commands

Command	Description
/lekha <prompt>	Generate content with AI
/search <query>	Web search with inline results
/viz <prompt>	Create data visualizations from CSV
/chart <prompt>	Generate Mermaid flowcharts and diagrams
/todo <task>	AI-powered task planning

Data Visualization

• Upload CSV files and create charts with natural language
• Use @filename to target specific datasets: /viz @sales.csv revenue by region
• Chart types: Bar, Line, Area, Pie, Scatter, Tables
• Auto-analyzes data structure for smart suggestions

Diagrams

• Generate flowcharts, sequence diagrams, and more with /chart
• Powered by Mermaid.js

Tech Stack

Layer	Technologies
Framework	Next.js 15, React 18, TypeScript
Backend	Convex (database + functions)
Real-time	Liveblocks (presence, cursors, comments)
Auth	Clerk (users + organizations)
Editor	TipTap (ProseMirror)
AI	OpenAI GPT-4o-mini, Vercel AI SDK
Visualization	json-render, Recharts, Mermaid
UI	Tailwind CSS, shadcn/ui, Radix

Quick Start

npm install

Create .env.local:

NEXT_PUBLIC_CONVEX_URL=
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY=
CLERK_SECRET_KEY=
LIVEBLOCKS_SECRET_KEY=
OPENAI_API_KEY=
TINYFISH_API_KEY=

Run development server:

npx convex dev   # Terminal 1
npm run dev      # Terminal 2

License

MIT