Apica ProxySniffer is described as '™ is a professional and high-duty Web Load and Stress Testing Tool that runs on Java'. There are more than 25 alternatives to Apica ProxySniffer for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Self-Hosted solutions. The best alternative is Apache JMeter, which is both free and Open Source. Other great apps like Apica ProxySniffer are Gatling (Free, Open Source), Loadrunner (Paid), k6 Cloud (Freemium) and Fast DDoS Attack Cmd (Free).
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.