# Differences in app development in Studio Web

> * In Studio Web, you add controls to an app by selecting the **Toolbox** icon below the **Project Explorer** icon, in the left-hand pane of the window, as opposed to selecting **Add control** in the standard Apps interface.
* Apps in Studio Web do not support rules. Use Studio automations triggered by events instead.
* Apps can only execute unattended automations using serverless robots.
* Apps do not currently support import and export of individual pages.

* In Studio Web, you add controls to an app by selecting the **Toolbox** icon below the **Project Explorer** icon, in the left-hand pane of the window, as opposed to selecting **Add control** in the standard Apps interface.
* Apps in Studio Web do not support rules. Use Studio automations triggered by events instead.
* Apps can only execute unattended automations using serverless robots.
* Apps do not currently support import and export of individual pages.

For more information on current limitations, refer to the [Known limitations section of the Studio Web documentation.](https://docs.uipath.com/studio-web/automation-suite/2.2510/user-guide/known-limitations)