Loadium is described as '- JMeter Based Performance Testing Tool'. There are more than 25 alternatives to Loadium 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 Loadium are locust (Free, Open Source), Loader.io (Freemium), Yandex.Tank (Free, Open Source) and k6 (Free, Open Source).
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.