Blitz

Blitz is formerly a service from Mu Dynamics, which was acquired in 2012 by UK-based technology firm Spirent Communications.Blitz is a cloud-based load-and performance-testing service (SaaS) that allows developers to "rush" (load test) a Web app or Web API with up to 50,000 concurrent users within seconds from multiple points of presence around the world. The tool allows users to test web applications, websites, and APIs to identify infrastructure weaknesses.