---
category: [Administration & Integrations, Administration & Integrations/Custom Integrations & Apps, Platform and Product Extensions, Platform and Product Extensions/Workday Extend, Platform and Product Extensions/Integration]
keyword: Extend
nav: wcp_docs
parent_url: /wcp_docs/
title: >- 
  Concept: App Builder
layout: subsection
---

<a id="section_txh_vdx_ktb"></a>
App Builder enables you to author Workday Extend apps on the Workday Developer Site. You can use App Builder to:

-   Author your app components on the Workday Developer Site.
-   Validate the syntax and semantics of your app at any time before you deploy it.
-   View Build, Debug (Beta), and API logs (Beta).
-   Save your app to App Hub.
-   Deploy your app to Development tenants for testing.


App Builder automatically preserves code changes as you make them for your account only. Click <b>Save to App Hub</b> to permanently save changes as the latest version of the app.

Extend app components are the building blocks for constructing the user interface, data, logic, and security layers of a Workday Extend app. For more information, see: [Concept: Extend App Components](/wcp_docs/kwv1612374098305.html).

## <a id="section_glv_rwm_4wb"></a>Workday Extend Plugin for IntelliJ

Although App Builder provides the best development experience for Workday Extend, our plugin for the IntelliJ IDE remains available. The IntelliJ plugin has its own separate section in this documentation.