HTTPulse is described as 'Zero-setup, browser based solution for performing REST API health checks and load tests'. There are more than 25 alternatives to HTTPulse, 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 HTTPulse are locust (Free, Open Source), hey (Free, Open Source), Loader.io (Freemium) and Tsung (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.