Google Antigravity + Claude Code: the combo that builds apps for you

I built a complete AI Writing Studio app without writing a single line of code — using Google Antigravity and Claude Code. In this tutorial, I'll show you exactly how to: → Set up Google Antigravity (Google's new agentic IDE) → Use Gemini 3 to architect and plan your app → Install Claude Code for the actual coding → Build a fully functional React app with 4 AI-powered features This workflow is perfect for vibe coders, no-code builders, and anyone who wants to build apps faster using AI agents. ⏱️ TIMESTAMPS: 00:22 - Download & Setup 00:40 - Understanding the Interface 02:30 - Creating Your Project 02:44 - The Master Prompt (Gemini 3) 03:49 - Watching Gemini Architect Your App 04:50 - Installing Claude Code 07:16 - Initializing Claude 09:26 - Building the App 09:37 - App Demo 12:37 - free api key and terminal use 🔗 LINKS: → Google Antigravity: https://antigravity.google.com → Claude Code Install: code.claude.com/docs/en/overview → Claude AI: https://claude.ai 📋 MASTER PROMPT (copy this): You are a lead developer. I have a project roadmap for an architecture kick-off. I want to build an AI Writing Assistant Studio—a React app with 4 main features: 1) Text Improver - Rewrite text in professional, casual, persuasive, and grammar-fix styles 2) Content Generator - Generate blog posts, emails, and social media content 3) Smart Analyzer - Analyze readability, tone, and extract key topics 4) Format Converter - Convert between blog, email, notes, and technical formats. The app should use React and Tailwind CSS. Please create: Complete project structure, detailed implementation roadmap, technical specifications for each feature, step-by-step development plan. IMPORTANT: Structure this as a roadmap for an agent to follow. Do NOT write any code yet—just plan the architecture. 💬 Drop a comment: What app would YOU build with this workflow?