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testcritic

Grafana k6 vs autocannon

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.

Grafana k6Load & Performance
autocannonLoad & Performance

Entry price

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

Free tier

Free and open source

Open source

What drives the bill

The metric that actually scales your invoice.

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

Free tier

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

Everything, self-hosted

Open source

AGPL-3.0

MIT

Self-hostable

No-code authoring

Languages

JavaScriptTypeScript
JavaScript

Platforms

APIWeb
API

Fits teams

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

Adoption

Category standard

Grafana Labs · since 2016

Established

OSS community · since 2016

Strengths

  • 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.
  • Zero configuration; useful output in seconds.
  • Good percentile reporting for such a small tool.
  • Scriptable from Node for micro-benchmarks in CI.

Limitations

  • 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.
  • Single endpoint only — no user journeys, no correlation, no think time.
  • No distributed execution.
  • HTTP/1.1 focused.

Best for

Engineering teams that want performance regression tests running in CI.

Quick endpoint benchmarks and micro-optimisation work.

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.