Your computer, not a rented tab
Source, uncommitted work, and secrets stay on your machine until you publish. Open the files, read the diff, keep the repo — nothing important lives only inside a browser session.
Why Spawn
Because the app should live on your machine — then on the internet.
Spawn is a private app builder: real files on your computer, a localhost preview, Build chat to change them, then Go Live for a public HTTPS URL. Domains, secrets, and plugins stay in the same product.
- Private machine
- Real public URL
- Build chat
- Ship kit included
What most builders leave out
Generic chat-to-app tools often stop at a temporary preview or a disposable export. Spawn is built for the full loop — private work, then a URL you’d put your name on.
A real public site
Go Live opens shareable HTTPS from your machine (Ship → Open to the internet — copy or QR). Lasting custom domains need DNS + port-forward; keep the PC on for lasting traffic — the same app you ran on localhost.
Build chat on real files
Ask in English; Spawn edits the project, shows the diff, and refreshes the preview. Iteration is the product — not a one-shot dump of code you can’t keep evolving.
Domains, secrets, plugins — here
Custom hostname, env injection, and extensions live inside Spawn. You don’t bounce across hosting consoles just to finish shipping.
How public actually works
Same honesty as How it works — so Why doesn’t oversell the internet path.
- Share now Ship → Open to the internet → copyable HTTPS URL and phone QR.
- Lasting domain DNS to your WAN IP + router port-forward. Spawn shows the steps.
- Machine stays on Lasting traffic needs your PC (and Spawn) running. Tunnel links can refresh after reconnect.
Six principles
The bar we build to — complementary to Product and How, not a second feature list.
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Build on your machine
Local-first, not cloud-only.
The project is files. Diff them, commit them, keep them. The builder doesn’t own your source.
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Run it locally
The real process, not a mock.
Hit Run. Preview is localhost — the same app you’ll ship. Deploy stays optional until you’re ready.
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Ship a real URL
On the internet, not a throwaway tab.
Go Live opens shareable HTTPS from your machine. Lasting custom domains need DNS + port-forward; keep the PC on. Iterate after — Build chat still works once the link is live.
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Code and secrets stay yours
You own the machine.
Source stays local until you publish. Keys live in Secrets and inject at run and deploy — not in a workspace you don’t control.
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Evolve continuously
v1 is not the finish.
Chat a change, re-run, republish. The same loop keeps moving after the first URL is live.
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A premium bar, not a demo
Software you’d put your name on.
Structure, diffs, a live site. Spawn is for products you’d ship — not a throwaway mock.
Who it’s for
- You want the files A project on your computer. Open it, diff it, keep it.
- You’re putting a name on it A public HTTPS link from your machine — and a lasting domain when you wire DNS.
- You’ll keep going Change, run, and publish again after the first link is live.
See the loop, then get in
Private beta — invite-only. Tour the product, look at what ships, or join the list.