How Builder Works

A high-level look at what happens between your prompt and a finished website.

The output is a real codebase

Every site Builder generates is a genuine Next.js application written in TypeScript — not a page-builder abstraction or a proprietary format. That's what makes export, self-hosting, and reading the generated code all possible.

AI generation

Builder is powered by Claude, Anthropic's family of AI models. Different stages of building a site — understanding your prompt, planning the site's structure, writing the actual code, catching and fixing errors — are handled by different model tiers chosen for that task, which is part of how Builder keeps typical generations to well under a minute.

Live preview, safely

While your site is being built or edited, the preview you see runs inside a temporary, isolated sandbox environment rather than on shared infrastructure — so previewing arbitrary generated code stays safe and each project's preview is fully independent of every other.

Everything is versioned

As your project changes, Builder checkpoints it and pushes the code to a linked GitHub repository in the background. That's what powers version history — restoring an earlier state is really just checking out a prior commit.

Getting it live

When you're ready to ship, Builder can deploy your project to Vercel directly, or hand you the finished code as a ZIP to deploy anywhere you choose.