Locust

Locust is an open-source load testing tool that allows you to define user behavior using plain Python code. This code-based approach eliminates the need for cumbersome UIs or complex XML configurations, making test creation intuitive and version-control friendly. Its architecture is distributed and highly scalable, capable of simulating millions of simultaneous users by distributing the load across multiple machines. Proven and battle-tested, Locust is trusted by major companies like EA/DICE to load test large-scale applications. Key features include:

• Code-Based Scenarios: Write user tests in pure Python for maximum flexibility.
• Distributed Testing: Scale your tests across multiple machines to generate massive load.
• Web-Based UI: Monitor test progress in real-time with a clean web interface showing key metrics.
• Extensible: Can be used to test almost any system or protocol, not just HTTP/S.