Previews
How the sandbox preview works, what environment it runs in, and what you can do with the URL.
Where it runs
Each project gets an isolated Cloud Run container. The container builds your project on first load and serves the dev build. It sleeps when idle; the listen-first sandbox server responds to the next request in ~100 ms with a "starting" health check, and the iframe finishes loading once Vite is ready (typically 2-4 seconds after wake).
Sharing the URL
Every preview URL is public read-only. Share it in Slack, a tweet, a client proposal — anyone with the link can load the site. The URL stays stable as long as the project exists.
Limits
Previews are dev builds, not production bundles. Source maps are exposed. For a real production deploy, export the project to your GitHub account, clone or connect that repo, and deploy to Vercel, Netlify, Cloudflare Pages, or any host.
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