With AppScan® it is easy to write and integrate extensions. Extensions are add-ons that add functionality to AppScan®. They can be anything from a small email notification utility, to a full blown vulnerability exploit tool. Extensions enable users to customize AppScan® to their own needs. They are written using AppScan's SDK and extensions framework.

The SDK online help file AppScanSDK.chm can be found in the main AppScan® documentation folder.

AppScan® comes with some extentsions built-in, and it is easy to integrate and manage additional extensions using the Extension Manager.