As stated on the official Blackfire website (https://blackfire.io), Blackfire empowers all developers and IT/Ops to continuously verify and improve their app's performance, throughout its life cycle, by getting the right information at the right moment. It is, therefore, a performance management solution that allows you to automatically profile your code and set performance standards through assertions throughout your application's life cycle, especially in the development phase. Blackfire.io is a tool that makes what Fabien Potencier calls performance as a feature possible, by making performance tests a part of the development cycle from the very beginning of a project.