locust ☆
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Description:
Scalable user load testing tool written in Python
Type: Formula  |  Latest Version: 2.42.6@0  |  Tracked Since: Dec 6, 2025
Links: Homepage  |  @locustio  |  formulae.brew.sh
Category: Developer tools
Tags: load-testing testing devops python performance
Install: brew install locust
About:
Locust is a Python-based, open-source load testing tool that enables developers to simulate millions of simultaneous users. It allows you to define user behavior with plain Python code, providing a flexible and powerful way to test system performance. Unlike many other tools, Locust is distributed and scalable, running tests across multiple machines with a web-based real-time monitoring interface.
Key Features:
  • Define user behavior in pure Python code for maximum flexibility
  • Distributed and scalable architecture to simulate millions of users
  • Web-based UI for real-time monitoring of test progress and statistics
  • Extensible and hackable, allowing for custom client types and scenarios
Use Cases:
  • Stress testing web applications and APIs to find breaking points
  • Simulating concurrent user traffic to measure system performance
  • Identifying performance bottlenecks before production deployment
Alternatives:
  • k6 – k6 uses JavaScript and is often considered easier for developers to pick up, while Locust's Python syntax offers more power for complex scenarios.
  • JMeter – JMeter is Java-based with a GUI, making it more accessible for non-programmers, but less code-centric and flexible than Locust.
Version History
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