> ## Documentation Index
> Fetch the complete documentation index at: https://twenty-c--pull-3-cli.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Developers

> Build apps, use the API, self-host, or contribute to the codebase.

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<CardGroup cols={3}>
  <Card href="/developers/extend/apps/getting-started/quick-start" img="https://mintcdn.com/twenty-c--pull-3-cli/pTPb8ite4vuL8orW/images/user-guide/halftone/dev-apps.png?fit=max&auto=format&n=pTPb8ite4vuL8orW&q=85&s=2aac51de79bae2d363fe100afea65a1e" width="2880" height="1360" data-path="images/user-guide/halftone/dev-apps.png">
    <CardTitle>Apps</CardTitle>
    Extend Twenty with custom objects, server-side logic, UI components, and AI agents — all as TypeScript packages.
  </Card>

  <Card href="/developers/extend/api" img="https://mintcdn.com/twenty-c--pull-3-cli/pTPb8ite4vuL8orW/images/user-guide/halftone/dev-api.png?fit=max&auto=format&n=pTPb8ite4vuL8orW&q=85&s=ff1fa635d304366e392234e68567e9fa" width="1440" height="680" data-path="images/user-guide/halftone/dev-api.png">
    <CardTitle>API</CardTitle>
    REST and GraphQL APIs, webhooks, and OAuth.
  </Card>

  <Card href="/developers/self-host/capabilities/docker-compose" img="https://mintcdn.com/twenty-c--pull-3-cli/pTPb8ite4vuL8orW/images/user-guide/halftone/dev-self-host.png?fit=max&auto=format&n=pTPb8ite4vuL8orW&q=85&s=31e333e2b47f36c55d4e302c34658db7" width="1194" height="562" data-path="images/user-guide/halftone/dev-self-host.png">
    <CardTitle>Self-Host</CardTitle>
    Run Twenty on your own infrastructure.
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    <CardTitle>Contribute</CardTitle>
    Set up the monorepo locally and submit PRs.
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