Observability & Monitoring

Locust

Scalable user load testing tool written in Python.

Status
Generally available
Last checked
Checked · Oct 15, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

Locust is a powerful and scalable user load testing tool designed to test the performance of web applications under heavy loads. It's particularly useful for developers who need to ensure their application can handle large numbers of concurrent users without degradation in performance.

Locust stands out as an open-source, Python-based tool offering scalable load generation and real-time performance monitoring, ideal for developers who prefer self-hosted solutions.

When it fits — and when it doesn’t

A good fit for

  • Development teams needing to simulate high user traffic scenarios for their web applications

  • Projects requiring real-time performance monitoring and analysis during load testing

Look elsewhere if

  • Teams looking for a cloud-based managed service for load testing

  • Applications that require specialized load testing beyond HTTP/gRPC protocols

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited integrations with non-Python ecosystems

    Primary support for Python, limited or no official SDKs for other languages

  2. 02

    Complex setup for distributed load generation

    Requires manual configuration and coordination across multiple machines

What it does well

  • Scalable load testing for web applications

  • Supports both HTTP and gRPC protocols

  • Distributed load generation across multiple machines

  • Real-time statistics dashboard

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up Locust

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →