k6 vs Artillery 2026: Node Performance Testing
k6 vs Artillery 2026: Go binary running JS vs pure-Node load testing, throughput, configs, CI.
k6
Go binary running JS load test scripts
- License
- AGPL v3
- Language
- JavaScript
npx @qaskills/cli add k6-performanceArtillery
Pure Node.js load testing tool
- License
- MPL 2.0
- Language
- YAML + JS
k6 and Artillery are two Node-friendly load testing tools in 2026. k6 ships a Go binary that runs JavaScript scripts — higher throughput per host, scripts feel like writing app code. Artillery is pure Node, configs in YAML (or programmatic JS), strong WebSocket + Socket.io support, easier integration into Node-only stacks.
Feature-by-Feature Comparison
| Feature | k6 | Artillery |
|---|---|---|
| Runtime | Go binary running JS | Pure Node.js |
| Script format | JS export default function | YAML config or JS |
| Max VUs per host | 30K+ | 10K-20K |
| WebSocket | Yes | Yes — first-class |
| Socket.io | Via extension | First-class |
| Cloud | Grafana Cloud k6 | Artillery Cloud |
| CI integration | JUnit XML + GitHub Action | CLI exit codes |
| Observability | Prom/Loki/Grafana native | Datadog + CloudWatch + custom |
| License | AGPL v3 | MPL 2.0 |
Strengths of k6
- •Higher throughput per host
- •Native Prometheus/Grafana
- •Thresholds = CI gates native
- •xk6 extensions for any protocol
- •JUnit XML out of the box
- •Single Go binary
Strengths of Artillery
- •Pure Node — fits Node-only stacks
- •YAML config beginner-friendly
- •WebSocket + Socket.io first-class
- •MPL 2.0 (more permissive than AGPL)
- •Programmatic JS mode for complex scenarios
- •Strong Lambda runner mode
When to pick k6
Pick k6 for VU density + Grafana stack + AGPL acceptable.
When to pick Artillery
Pick Artillery for Node-only teams + WebSocket/Socket.io + MPL license + YAML configs.
Verdict
k6 for density + Grafana stack. Artillery for Node-only + WebSocket-heavy use cases.
Frequently Asked Questions
Throughput?
k6 wins ~1.5-3x per host. Artillery scales horizontally to compensate.
License concern?
k6 AGPL v3 means modifications must be open-sourced if redistributed as a service. Artillery MPL 2.0 is more permissive.
WebSocket testing?
Artillery first-class (Socket.io + WS). k6 supports but feels less native.
Lambda mode?
Artillery has a Lambda runner for distributed load. k6 uses k6 operator or Grafana Cloud.
Deep-Dive Articles
Need a ready-made testing skill?
Both k6 and Artillery have curated QASkills.sh skills you can install into Claude Code, Cursor, Copilot in 5 seconds.
Comparisons reflect public information as of 2026-05. Tooling evolves quickly — verify current state on official docs before final decisions.