Build and Host a Custom CRM with Google Antigravity

In this guide, you will learn how to use Google Antigravity to turn a plain-English app spec into a hosted full-stack CRM. The key move is making the agent plan first, then using Firebase Auth, Firestore, and Firebase Hosting so the app has login, saved data, search, and a real URL.

• Founders and operators who want a quick internal tool without spending the whole day setting up a backend.
• Non-engineers who are comfortable prompting AI but get stuck when the app needs auth, a database, and deployment.
• Developers who want to test Google's agent-first coding workflow against tools like Cursor, Claude Code, or Codex.

You will build Northstar CRM, a small internal sales app with login, contacts, companies, deals, notes, search, dashboard cards, and a Firebase Hosting URL.

This is not meant to be a finished enterprise CRM. The win is getting a real full-stack app online fast enough that you can test the workflow, then decide what is worth polishing.

• A Google account.
• Google Antigravity (https://antigravity.google/download).
• A clean project folder.
• Node.js and npm installed.
• A Firebase project, or permission to let Antigravity help create one.
• A simple app idea. This guide uses a CRM because it needs auth, records, search, and deployment.

You can start with a free Google account, but Antigravity usage may hit limits depending on your account and model. In the recording, the app still got built and deployed, but the workflow did hit a usage-limit moment during setup.

After the Firebase deploy works, ask Antigravity to add one upgrade at a time.

Good next prompts:

Add Google sign-in to this Firebase Auth flow.

Set up Google Analytics for this Firebase web app and show me what I need to confirm in the Firebase Console.

Walk me through connecting a custom domain to this Firebase Hosting app.

The bigger lesson is that Antigravity is especially useful when the app touches Google's stack. If you get confused by Firebase, Google Cloud, Analytics, Auth, or Hosting, ask Antigravity for the next exact step and make it explain what to click before you change anything important.