Penetration testing has proven to be a valuable preventive application security technique. A variety of automated tools and manual approaches are used to assess and expose vulnerabilities in target applications. By definition, black box testing offers little insight into the internals of target applications. Therefore, understanding the code coverage and testing overlap, or perhaps more importantly the coverage boundaries, has often been diﬃcult to ascertain. Secure Decisions has built a free open source tool, Code Pulse, to help overcome these challenges. Code Pulse is a visualization-centric tool that provides insight into the real-time code coverage of black box testing activities. It is a desktop application that runs on most major platforms. Code Pulse has been transitioned into an OWASP project. For more information, please visit the Code Pulse OWASP Project page.