Grafana k6

Package

Open-source load testing tool with test scripts written in JavaScript

Price: Free, open source; cloud free tier
Access: None locally; Grafana Cloud token

About

k6 is an open-source load testing tool from Grafana Labs: you script virtual users in JavaScript and run them from the CLI, in CI or on Grafana Cloud. It covers HTTP, WebSockets, gRPC and browser tests. The CLI is AGPL-3.0; the cloud service is paid above a free tier.

What you can do with it

Ramp up virtual users against an API and assert on p99 latency thresholds
Run performance tests in CI and fail the build when a threshold breaks
Run tests on Grafana Cloud k6, a managed performance testing service

Get started

Install k6, for example with brew install k6
Save the script below as script.js
Run k6 run script.js

Example

import http from 'k6/http';
import { sleep } from 'k6';

export const options = {
  iterations: 10,
};

export default function () {
  http.get('https://quickpizza.grafana.com');
  sleep(1);
}

Details

Hosting: Hosted service, Runs locally
Available in: Worldwide
MCP server: Local