How to Add Browser Preview for Your App in Antigravity (Step by Step) 2026

Quick guide on enabling the browser preview in Antigravity so you can see your app running locally while you code. I show you how to open the preview window, start your local server using npm run dev, or let the agent automatically generate your live preview URL for you. You’ll also learn how to test your app inside the preview, how the agent can interact with your UI automatically, and how to check whether Node.js is installed. You can even open your HTML file directly if you prefer a simple file‑based preview. Tags antigravity, browserpreview, localhost, localserver, claude, claudeai, nodejs, npm, devserver, codingworkflow, development, techguide, tutorial, stepbystep, productivity, workflow, webdevelopment, livepreview, agenttools, automation, testing, qa, codingprojects, creatorworkflow, efficiency, techsetup, howto, guide, webapp, frontenddev