Locustio, accessible at https://locust.io, is an open-source load testing tool designed to help developers and testers simulate millions of simultaneous users on a system, website, or application to check its performance under stress. Unlike many other testing tools that use a GUI, Locustio utilizes simple Python scripts, offering flexibility and the ability to write very expressive scenarios. This approach makes it accessible for developers familiar with Python and allows tests to be as simple or complex as needed. Locustio is highly scalable and can run on multiple machines to simulate large numbers of users, making it an ideal choice for testing high-traffic websites or enterprise-level services. Its user-friendly web interface for monitoring the test's progress in real-time further enhances its utility, providing instant feedback and metrics directly related to the load test being conducted.