Gatling

Developer Tools Free (open-source) · Gatling Enterprise from $499/mo

About Gatling

Gatling replaces guesswork with data: write load tests in Scala or Kotlin, simulate thousands of users hitting your web app, and get real-time metrics on response times and error rates.

What it does

Gatling is an open-source load testing framework that lets you define user scenarios as code. It generates HTTP requests, measures server performance, and produces HTML reports with charts and stats. The cloud version (Gatling Enterprise) runs tests at scale without managing infrastructure.

Best for

DevOps engineers running CI/CD pipeline performance checks
QA teams validating app stability under traffic spikes
Developers who want code-based test scenarios (no GUI drag-and-drop)

Strengths

Open-source core with a large community and extensive documentation
Scala/Java DSL for precise control over test logic
Real-time metrics and detailed HTML reports
Cloud option for distributed load generation

Key features

Code-based test scenarios — Write tests in Scala or Kotlin with a fluent DSL
Real-time monitoring — Live dashboard shows response times, throughput, and errors
HTML reports — Auto-generated reports with charts, percentiles, and request details
CI/CD integration — Run tests in Jenkins, GitLab CI, or GitHub Actions
Distributed load generation — Gatling Enterprise runs tests from multiple geographic locations
Protocol support — HTTP, HTTPS, WebSocket, and more

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