k6 is Grafana Labs' open-source, JavaScript-based load testing tool, with a paid Grafana Cloud k6 service for distributed testing. See features, pricing, and…
Category
DevOps
Pricing
Free, open-source CLI/engine (self-hosted, no cost). Grafana Cloud k6 is usage-based: Pro starts at a $19/month platform fee plus $0.150 per virtual user hour (500 VU-hours included monthly); Enterprise is custom-priced with a minimum $25,000/year commitment.
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Last updated
August 6, 2026
Usage-Based PricingTestingAPIOpen SourceCloud
k6 is a developer-first load and performance testing tool, originally built by Load Impact and now developed and commercialized by Grafana Labs. Tests are written as JavaScript, letting engineers version, review, and reuse them like any other code, and can exercise HTTP/REST, GraphQL, WebSocket, and gRPC APIs. The core engine is written in Go for high throughput, and the same test scripts can run locally via the k6 CLI, in a Kubernetes cluster, or in Grafana Cloud k6 for distributed, higher-scale runs across multiple global load zones. Beyond basic load testing, k6 supports browser-based testing, threshold-based pass/fail criteria for CI/CD gating, and an extensible xk6 ecosystem that adds support for Kafka, SQL, Kubernetes, and chaos/fault-injection testing. Results can be streamed to Grafana, Prometheus, Datadog, New Relic, and other observability backends. Grafana Cloud k6 is the fully managed, commercial version of the product, adding hosted execution, more load zones, and enterprise deployment options (public cloud, federal cloud, or bring-your-own-cloud) on top of the free open-source core.
Key Features
JavaScript-based test scripting — Write load and performance tests as JavaScript so they can be version-controlled, code-reviewed, and reused like any other application code.
Multi-protocol testing — Test HTTP/REST, GraphQL, WebSocket, and gRPC APIs, plus browser-based scenarios, from a single tool.
Local, Kubernetes, or cloud execution — Run the same test scripts locally via the k6 CLI, inside a Kubernetes cluster, or at distributed scale in Grafana Cloud k6 across multiple global load zones.
CI/CD-ready thresholds — Define pass/fail thresholds so performance tests can gate builds automatically inside CI/CD pipelines.
xk6 extension ecosystem — Extend k6 with community and official extensions for Kafka, SQL, Kubernetes, chaos/fault injection, and more beyond core load testing.
Observability integrations — Stream test results to Grafana, Prometheus, Datadog, New Relic, and Timescale for analysis and dashboards.
Pros & Cons
Pros
Free, open-source core with no forced upgrade to use k6 for local or CI-based load testing
Tests are written in JavaScript, so they're easy to version-control, code-review, and reuse across a team
Backed by Grafana Labs, with tight integration into Grafana, Prometheus, and other observability backends
Extensible via the xk6 ecosystem for Kafka, SQL, Kubernetes, and browser/chaos testing beyond plain HTTP load testing
Supports multiple run modes (local CLI, Kubernetes, Grafana Cloud) using the same test scripts
Cons
Writing and reading test scripts requires JavaScript/coding skill, unlike no-code load testing tools
Large-scale distributed runs and extra load zones require paid Grafana Cloud k6 rather than the free open-source CLI
Enterprise-tier pricing starts at a $25,000/year commitment, which is out of reach for small teams
Detailed built-in reporting/dashboards are lighter than dedicated APM tools unless results are piped into Grafana or another backend