Loadrunner is described as 'LoadRunner is a software testing tool used to test applications, measuring system behaviour and performance under load. LoadRunner can simulate thousands of users concurrently using application software, recording and later analyzing the performance of key components of the' and is an app. There are more than 25 alternatives to Loadrunner for a variety of platforms, including Windows, Linux, Web-based, Mac and SaaS apps. The best Loadrunner alternative is Apache JMeter, which is both free and Open Source. Other great apps like Loadrunner are locust, Guardius, Load Testing Tool and Loadster.