Spec-driven development

Build full web apps with minimal code

Define your UI in Java — and get a working web app instantly.

No frontend. No APIs. No duplicated models.

Built for modern architectures

Each service can own its UI.

No central frontend. No coordination bottlenecks.

Write this

@UI("")
public class Home {

  @ReadOnly
  int count = 0;

  @Button
  Runnable increment = () -> count++;

}

Get this

A real example

@UI("/users")
public class Users {

  List<User> users = userService.findAll();

  @Button
  Runnable create = () -> {};

}

Mateu generates a full CRUD UI automatically:

• tables
• forms
• actions
• navigation

UI federation

Compose UIs across services — without a frontend application.

• each service owns its UI
• independent deployment
• no frontend integration layer

👉 Learn about UI federation →

Why Mateu

• ⚡ Build apps faster
• 🧠 One language, one mental model
• 🔥 No frontend duplication
• 🌐 Designed for distributed systems
• 🔌 Embeddable as web components

Built for

• internal tools
• CRUD applications
• enterprise apps
• microservice UIs
• embedded UIs

👉 Explore use cases →

Stop splitting your app.

Define it once.

👉 Try the live demo

Built by developers who got tired of building the same app twice.