Developer-first load testing: JavaScript scripts, Go engine, CI-native thresholds.
k6 scripts are JavaScript but execute on a Go runtime, giving a familiar authoring language with far better resource efficiency than JVM- or Python-based generators. Thresholds let a test fail the build on p95 latency or error rate, which is what makes it usable as a regression gate rather than an occasional exercise. Grafana Cloud k6 adds distributed execution and dashboards.
Best for
From $19 per month (indicative, Grafana Cloud k6 entry)
Free tierFree tier: The k6 CLI is fully open source with no virtual-user limits when self-run.
What drives the bill: Self-hosted is free and unlimited. Cloud plans are billed by virtual-user-hours, which is where budgets go.
Check current pricing on Grafana Labs’s siteFigures are indicative and were last reviewed August 2026. Vendors change pricing often; confirm before you commit.
No reviews of Grafana k6 yet. If you have used it in anger, yours would be the first.
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