TL;DR - k6
- k6 is an open-source load testing tool for testing API and website performance
- It uses JavaScript to script performance tests with developer-friendly workflows
- Free and open-source, Cloud plans from $99/month
Pricing: Free plan available
Best for: Growing teams
Score: 85/100
Pricing Plans
free trialMost Popular
Free
Free
Open source
- Local execution
- Scripting
- Metrics
- Thresholds
Cloud Free
Free
50 VUh
- 50 VUh/mo
- Cloud execution
- Dashboards
Cloud
$99/month
500 VUh
- 500 VUh
- Team features
- Support
About k6
k6 tests performance with modern developer experience. Write tests in JavaScript, run them locally or in cloud—load testing that feels like coding.
The test syntax is clean. The results are detailed. The cloud option scales.
Developers wanting approachable load testing choose k6 for performance testing that fits their workflow.
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k6 FAQ
k6 OSS is free and open source. Grafana Cloud k6 has free tier. Pro and Enterprise for more features.
k6 is a modern load testing tool. Write tests in JavaScript, run from CLI. Acquired by Grafana Labs.
k6 is modern, scriptable, and developer-friendly. JMeter is older with GUI. k6 for developers; JMeter for QA teams.
Load testing, stress testing, and API testing. HTTP, WebSocket, and gRPC. Browser testing with k6 browser.