Load Tester is described as 'Web Performance Load Tester™ is the only web testing tool smart enough to tell you how many users your website can handle. Use another tool, and youll find yourself staring at charts for hours trying to figure it out—if you can even tell at all'. There are more than 25 alternatives to Load Tester 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 Load Tester are locust (Free, Open Source), Loader.io (Freemium), Yandex.Tank (Free, Open Source) and Gatling (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.
OctoPerf is a SaaS load testing solution, based on JMeter. Stress test your web and mobile apps within minutes. Design realistic virtual users. Scales to thousands of user from multiple locations simultaneously. We take care of the infrastructure.