JMeter vs k6 in 2025: Which Should You Use?
January 2025 · 8 min read
JMeter has been the default load testing tool for over two decades. k6, launched in 2016, took a developer-first approach that resonated with modern teams. In 2025, both are mature and widely used. Here's how to choose.
JMeter: strengths
GUI-based test builder: Good for teams less comfortable with code
Ecosystem: Thousands of plugins and decades of community knowledge
Reporting: Built-in dashboards and HTML reports
Protocol support: HTTP, JMS, JDBC, SMTP, and more
k6: strengths
Code-first: Tests are JavaScript — version-controlled, code-reviewed, refactored
CI/CD native: Designed to run in pipelines from day one
Performance: Dramatically lower resource usage per virtual user
Modern output: Native support for Grafana, InfluxDB, and Prometheus
Our recommendation
For teams with existing JMeter expertise or legacy test suites: stick with JMeter.
For greenfield projects, developer-led teams, or anyone building CI/CD-integrated tests: k6 is the better choice in 2025.
PerfMonk supports both — plus Locust and Gatling — so you don't have to choose one forever.