Most tool vendors attempt to design products with complete functionality. For many customers, this is not sufficient enough. Whether you want to integrate a home-grown tool or require specific functionality that is currently unavailable. Flexible customization capabilities can act as an enabler for these exact situations. Tosca Testsuite is a market leader for most versatile APIs. It provides necessary and intuitive customization capabilities for our customer requirements. Furthermore, the Tosca Testsuite API provides several ways to integrate your own functionality into Tosca in order to bring the power of Tosca and your ideas together.