CloudTest is described as 'Load Testing of Web Sites, Mobile Applications, Web Services, and Web Sockets. Real-Time Analytics, Public Cloud load injectors, rapid test development, real user data, network emulation, SLAs, all with CI Integration. 100VUs for free, forever'. There are more than 25 alternatives to CloudTest for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and Self-Hosted solutions. The best alternative is locust, which is both free and Open Source. Other great apps like CloudTest are Apache JMeter (Free, Open Source), Loader.io (Freemium), YandexTank (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.