---
title: App
description: How the main application works in kreogen.
product: App
type: reference
summary: How the main user-facing application works in kreogen.
related:
  - /en/docs/packages/authentication
  - /en/docs/packages/database
  - /en/docs/packages/design-system/components
---

# App



<Callout>
  The `app` application runs on port 3000. We recommend deploying it to `app.{yourdomain}.com`.
</Callout>

kreogen exports the main app from the `apps/app` directory. It is designed to be run on a subdomain of your choice, and is used to run the main user-facing application.

## Overview

The `app` application is the main user-facing application built on [Next.js](https://nextjs.org). It is designed to be a starting point for your own unique projects, containing all the core functionality you need.

## Features

* **Design System**: The app is connected to the [Design System](/en/docs/packages/design-system/components) and includes a variety of components, hooks, and utilities to help you get started.
* **Authentication**: The app includes a fully-featured [authentication system](/en/docs/packages/authentication) with support for email login. You can easily extend it to support other providers and authentication methods. The app is also broken into authenticated and unauthenticated route groups.
* **Database**: The app is connected to the [Database](/en/docs/packages/database) and can fetch data in React Server Components.
* **Organizations**: Every user belongs to an organization, with members, roles and invitations, and an organization switcher in the sidebar.


---

For a semantic overview of all documentation, see [/sitemap.md](/sitemap.md)

For an index of all available documentation, see [/llms.txt](/llms.txt)