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testcritic

autocannon vs Grafana k6

Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.

autocannonLoad & Performance
Grafana k6Load & Performance

Entry price

Free and open source

Open source

From $19 per month (Grafana Cloud Pro platform fee; k6 usage is billed on top)

Free tier

What drives the bill

The metric that actually scales your invoice.

Free and open source. You pay in engineering time and CI minutes.

Self-hosted is free and unlimited. On Grafana Cloud the free tier includes 500 virtual-user-hours a month, then k6 bills from $0.150 per virtual-user-hour on top of the $19 Pro platform fee — the VU-hours, not the platform fee, are where budgets go.

Free tier

Everything, self-hosted

The k6 CLI is fully open source with no virtual-user limits when self-run.

Open source

MIT

AGPL-3.0

Self-hostable

No-code authoring

Languages

JavaScript
JavaScriptTypeScript

Platforms

API
APIWeb

Fits teams

Solo / side projectStartup
Solo / side projectStartupScale-up / mid-marketEnterprise

Adoption

Established

OSS community · since 2016

Category standard

Grafana Labs · since 2016

Strengths

  • Zero configuration; useful output in seconds.
  • Good percentile reporting for such a small tool.
  • Scriptable from Node for micro-benchmarks in CI.
  • Excellent resource efficiency — thousands of virtual users from one modest machine.
  • Thresholds make performance a build gate rather than a report nobody reads.
  • Native Grafana and Prometheus integration ties load results to server-side metrics.

Limitations

  • Single endpoint only — no user journeys, no correlation, no think time.
  • No distributed execution.
  • HTTP/1.1 focused.
  • The JavaScript runtime is not Node — no npm modules unless bundled, which surprises people.
  • Browser-level load testing exists but is much heavier and less mature than protocol-level testing.
  • Distributed execution requires either the cloud product or your own orchestration.

Best for

Quick endpoint benchmarks and micro-optimisation work.

Engineering teams that want performance regression tests running in CI.

Full review
Full review

All of these integrate with: GitHub Actions.

Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.