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Open-source performance and load testing tools: 16 compared

Tools that generate load and measure response times and throughput.

16 tools are listed here, 2 of them with this as a secondary category. Each one is open source under an OSI-approved license and meets the inclusion rules. The table is sorted by GitHub stars, descending, on the fetch date. Select a column heading to sort by another column.

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

Performance and load testing tools. Sorted by GitHub stars, descending. Select a column heading to change the sort.
k631,54812026-09-211v2.3.02026-09-221AGPL-3.0Goactive
Lighthouse30,79912026-09-181v13.5.02026-09-181Apache-2.0JavaScriptactive
Locust28,17712026-09-1712.46.62026-09-211MITPythonactive
Vegeta25,20012025-10-311v12.13.02026-02-161MITGoslow
hey20,27612026-01-101v0.1.52026-01-101Apache-2.0Goslow
oha10,55312026-08-231v1.16.02026-09-101MITRustactive
Apache JMeter9,54212024-01-091rel/v5.6.32026-09-121Apache-2.0Javaactive
Artillery9,08112026-08-141artillery-2.0.342026-09-201MPL-2.0TypeScriptactive
Karate8,96512026-08-141v2.1.22026-09-191MITJavaactive
autocannon8,52112024-10-141v8.0.02026-05-161MITJavaScriptslow
Gatling6,95812026-05-251v3.15.12026-09-221Apache-2.0Scalaactive
sitespeed.io5,03012026-09-111v42.7.02026-09-111MITJavaScriptactive
ali3,94012026-01-191v0.8.02026-01-191MITGoslow
Fortio3,72712026-08-291v1.75.32026-08-291Apache-2.0Goactive
ghz3,35412025-12-071v0.121.02026-09-011Apache-2.0Goactive
Tsung2,62812023-03-011v1.8.02026-03-021GPL-2.0Erlangslow

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

Comparisons in this category

Guide

Open-source load testing tools: how the list is sorted and what each covers