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Your app is visible from the first file written and shippable whenever you decide it is ready. Two mechanisms make that work: sandbox previews during development, and the Deploy Agent when you want to go live.

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Live previews while you build

Every project runs in an isolated cloud sandbox with a live preview URL. As agents write files, install dependencies, and run builds, the preview updates, so you review real behavior rather than descriptions of it. Previews are for development; they are not your production URL.

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Deploying

Deploy is an on-demand action, not a pipeline stage: trigger it whenever you want, as often as you want. When you do, the Deploy Agent runs a sequence designed to ship a working app, not just push files:
1

Check recent deploys

The agent first checks whether a recent deploy already covers the current state, avoiding redundant work.
2

Preflight build

It builds the project before anything ships. Problems surface here, not in production.
3

Push to GitHub

The code is pushed to your own GitHub repository, so every deploy corresponds to a commit you can inspect. See Code ownership.
4

Deploy to Vercel

The app deploys to Vercel and comes up at its live URL.
If the build or deploy fails, the agent does not just report the error: it attempts to fix the problem itself, with up to 3 self-fix iterations before it hands the issue back to you.
Run QA before deploying. The QA Agent tests your app in a real headless browser and returns a pass, partial, or fail verdict, and a fail can chain into an auto-fix run.

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Domains

Deployed apps ship to one of two places: The platform subdomain is the default: every deployed project gets a {slug}.product-os.app address with no setup. On Pro and above you can attach your own custom domain, and the watermark is removed. See Plans and credits for plan details.

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Where this runs

All ProductOS deployments target Vercel, and your code always flows through your own GitHub repo on the way there. That means no proprietary hosting layer: if you later want to deploy the same repo yourself, through your own Vercel account or any other host, nothing stands in the way.