Describe it. Get an app.
One sentence in, one working single-file web app out — streamed live as it’s written, published at your own URL.
Describe it
“A tip calculator for six friends.” One sentence is enough — add detail if you care about the details.
Watch it build
The app’s code streams in on the left while the app itself takes shape live on the right.
Publish it
One click puts it on the web at 1sh.app/you/tip-split — share the link or keep it to yourself.
Free service, your models
1sh.app is free — you bring your own API key from OpenRouter, Anthropic, OpenAI, or xAI. With an OpenRouter key the build itself can cost nothing too: its free-model router is what the picker selects by default. Your keys are stored encrypted in your browser, never in our database; each request carries your key only long enough to reach your provider.
Published apps are user-generated content: sandboxed, never search-indexed, and unlisted unless their owner adds them to Explore.