Describe an app.
Watch it build itself.

Nexa is an AI app builder that runs in your browser. Write what you want in plain words, and an agent writes a working web app you can preview, edit and export.

idle
prompt

reading your prompt…

Real apps from one prompt each. Click around, they work.

From a sentence
to a working app

No setup, no install, no framework to learn. Say what it should do and keep talking until it's right.

What you
can build

Anything that runs in a browser as a single page of HTML, CSS and JavaScript. A few things people make first:

  • Landing pagesProduct launches, waitlists, event pages, a site for a small shop."A launch page for a matcha brand with a waitlist form"
  • DashboardsCharts, stats and tables from sample data or numbers you paste in."A crypto portfolio dashboard with a donut chart"
  • Small toolsCalculators, converters, planners, trackers and to-do lists."Split a dinner bill with tip, per person"
  • Simple gamesWord games, quizzes, memory cards, snake and other canvas games."A memory card game with emoji and a timer"
  • PortfoliosOne-page profiles, galleries, link-in-bio pages and resumes."A portfolio for a 3D artist with a dark gallery"
  • PrototypesClickable mockups of an idea to show a team before anyone builds it."A mobile banking onboarding flow, 4 screens"

Front-end only. Apps have no server, database or user accounts. They can remember things in the visitor's browser and load libraries such as Chart.js or Three.js from a public CDN. See the limits →

Three steps,
then iterate

Each message builds on the version you're looking at. Keep asking until it is exactly what you had in mind.

  1. 01

    Describe it

    Say what it is, who it's for, how it should feel and what happens on click. One or two sentences is enough to start.

  2. 02

    Watch it build

    The agent replies with a short note, then streams a complete HTML file. The preview repaints as the code arrives.

  3. 03

    Refine and export

    Ask for changes, edit the code by hand, restore any earlier version, then download one HTML file you own.

  • Agent chatAsk for changes in plain words
  • Live previewDesktop, tablet and phone sizes
  • Code editorEdit by hand, preview follows as you type
  • Version historyRestore any of the last 15 builds
  • ProjectsKeep several apps, switch any time
  • ExportOne clean HTML file, no Nexa code inside
Token gated

Access

Loading access rules…

How sign-in works

  1. Connect your walletAny browser wallet such as MetaMask, Rabby or Coinbase Wallet. Nexa asks it to switch to the right network.
  2. Sign a messageA free signature that proves you own the address. No gas, no transaction, no token approval.
  3. Start buildingThe studio opens with your free builds. Once they're used, the server checks your token balance on-chain. The session lasts 7 days.

The studio is in demo mode right now, so there is no wallet step. Press the button and start building.

No token needed–

Signing never moves funds. After the free builds, your balance is checked on every build.

Questions

Can't find your answer? The docs go deeper.