LoadBooster is described as 'Utilizing headless scriptable browser PhantomJS and Amazon cloud servers, LoadBooster offers the unique load testing service that provides large testing capacity, a real browser user experience, better AJAX support, clearer error reporting, as well as high-fidelity test results'. There are more than 25 alternatives to LoadBooster, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Self-Hosted solutions. The best alternative is Apache JMeter, which is both free and Open Source. Other great sites and apps similar to LoadBooster are locust (Free, Open Source), Loader.io (Freemium), Yandex.Tank (Free, Open Source) and Gatling (Free, Open Source).
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.
AppPerfect Load Test is a fully automated load test, stress test and performance test solution that helps you design and simulate thousands of users in a realistic manner which can be used to load test your application infrastructure for performance, reliability and scalability.
step is a comprehensive test automation stack designed to achieve high efficiency in testing pipelines. It is well suited for DevOps delivery. It ships with a distributed execution platform, a collaborative test management system and many plugins.