TL;DR - Locust
- Locust is an open-source load testing tool written in Python
- It simulates millions of users with code-based test scenarios
- Completely free and open-source
Pricing: Free plan available
Best for: Growing teams
Pricing Plans
Most Popular
Free
Free
Open source
- Python scripting
- Distributed
- Web UI
- Real-time stats
About Locust
Locust tests system performance with Python. Write test scenarios as code, run distributed load—performance testing that feels like programming.
The Python interface is natural. The distribution scales. The metrics are detailed.
Developers wanting load testing in Python choose Locust for code-based performance tests.
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Locust FAQ
Open source and free. Python-based load testing. No paid version.
Load testing tool. Write tests in Python. Distributed testing support.
Locust uses Python. k6 uses JavaScript. Both excellent for load testing.