Locust lets engineers describe user behavior in ordinary Python code. Tests can run distributed across processes or machines and expose an HTTP web interface.
About
Locust is an open-source, modern load testing framework that allows users to write scalable load tests in plain Python, avoiding the need for clunky UIs or XML.
Features
- Plain Python test scripting
- Distributed testing capability
- Real-time statistics monitoring
- Scalable to simulate millions of users
- MIT open-source license
Pricing
The open-source core of Locust is free. Separately, Locust Cloud offers paid, usage-based SaaS plans for hosted infrastructure and reporting.
Author / Company
Locust is maintained by a community of contributors, with top contributors including cyberw, heyman, andrewbaldwin44, and others.
Latest release
2.46.2 · 2026-07-24
Version 2.46.2 includes fixes for response time percentile calculations, updates to StatsEntry typing, and various dependency bumps in the web UI.
Sources
GROUNDED VIA EXA · 2026-08-11