jambuild

jambuild is a prototyping tool for people who would rather describe a page out loud than write a prompt. You open a room in Chrome on a desktop, speak, and a first version of the page appears within seconds. From there you keep talking while the page keeps changing. The product launched publicly at the end of September 2026, built by Rajiv Ayyangar, and it runs entirely in the browser at app.jambuild.dev.

The pitch is blunt: build web apps by talking, and let your cursor fill in the nouns. What separates it from text-only AI builders is the pointing. Move your cursor over the page and whatever sits under it lights up, for you and for anyone else in the room. Say "make this bigger" or "move that under the headline" and the instruction has a target instead of a description. That single change removes most of the guesswork in a normal prompt, where you spend half your words explaining which button you mean.

The constraints are real and worth knowing before you sign up. A room holds two people, not a team. It expects Chrome on a computer, and other browsers get a waitlist form instead of the editor. Free builds come with a daily limit, and you can lift that limit by attaching your own API key. No export or hosting path is documented on the site, so treat what you build as something to review and iterate on rather than ship.

Getting Started

1. Open jambuild.dev in Chrome on a desktop and sign in with your Google account. The person you invite does not need one.
2. Describe the page you want. A first version shows up in seconds, and you can keep talking while it renders.
3. Point at a section or click a specific element, then say what should change about it.
4. Send the room link to one other person. They join as a guest, see the same page, and can talk and point too.
5. Keep the loop going. Every line you say to the builder is transcribed and stored with the prototype, so you can look back at how a decision was made.