# Install a Custom App (External) on macOS

## What is a Custom App, and when would I need to install one?

A Custom App is an application that is not included in the Faronics Deploy library of 80+ applications.

Custom Applications that are not part of the default Deploy application library can be added to the Applications grid. Once a Custom App is added, Deploy displays the version number of the application if it is installed on any computers. You can then install and uninstall the application from the grid.

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To update a Custom App, you will need to provide the latest version, unlike the built-in applications in the library whose updates are provided by Faronics Deploy.
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Not all external applications are compatible out of the box; however, Faronics has Deployment Specialists to assist by writing a custom wrapper for the external application, which will enable it to work. See [Request Assistance From a Deployment Specialist](https://docs.faronics.com/faronicsdeploy/application-management/install-uninstall-and-update-apps/install-application-s/install-external-application-s-custom-app/request-assistance-from-a-deployment-specialist) for further information.  
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To create a Custom App and install it for the first time, see [Create and Install a Custom App](https://docs.faronics.com/faronicsdeploy/application-management/install-uninstall-and-update-apps/install-application-s/install-external-application-s-custom-app/create-and-install-a-custom-app).