Teamscale is a software intelligence platform, that is, it creates transparency on code quality and the underlying software development process. This makes it possible for developers, testers and managers to better understand and control technical debt of their systems. In this paper, we give an overview of Teamscale and how this tool can be used in practice to control and lower technical debt in the long run. We explain which code analyses can be used to identify and address technical debt. Teamscale is available for free for research and teaching purposes at www.teamscale.io.