Loadrunner is described as 'LoadRunner is a software testing tool used to test applications, measuring system behaviour and performance under load'. There are more than 25 alternatives to Loadrunner for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and Self-Hosted solutions. The best alternative is Apache JMeter, which is both free and Open Source. Other great apps like Loadrunner are locust (Free, Open Source), Gatling (Free, Open Source), Loader.io (Freemium) and Yandex.Tank (Free, Open Source).
Apache JMeter is an open source Java application, designed to load test functional behavior and measure performance. Originally designed for testing Web Applications, it has since expanded to other test functions as well.
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Most users think Apache JMeter is a great alternative to Loadrunner.
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