Suggest a tool

k6 vs Lighthouse: open-source performance and load testing tools compared

Metrics as of , from the GitHub or GitLab API of each repository. Refreshed monthly.

Summary

k6: Load-testing tool that runs JavaScript test scripts from the CLI, in CI or on Kubernetes.

Lighthouse: Web page auditing tool for performance, accessibility and SEO, run from Chrome DevTools, a Node CLI or module.

Both are listed under Performance and load testing. The table gives repository metrics from the GitHub API with their fetch date, then the documented facts used for every comparison in this category, each linked to the README or docs page it comes from. A cell reads "not documented" when the fact was not found in the project's documentation (2 of 12 fact cells here); that does not mean the feature is absent.

Side by side

k6 and Lighthouse: metrics and documented facts, in the fixed row order used for performance and load testing comparisons.
Factk6Lighthouse
Stars31,548130,7991
Forks1,63519,7601
Contributors28913901
Last release2026-09-2112026-09-181
Last commit2026-09-2212026-09-181
Commits in 90 days1771571
LicenseAGPL-3.01Apache-2.01
Primary languageGo1JavaScript1
Statusactive1active1
ProtocolsHTTP, WebSockets, gRPC, browser; more through extensions source: READMEnot documentednot found in the project's documentation as of
Test authoring formatCode (JavaScript test scripts run by an embedded engine) source: READMEConfig file via --config-path; custom audits and gatherers written as extensions source: README
Distributed or parallel loadDistributed tests on Kubernetes with the k6-operator (TestRun parallelism) source: Docs: Running distributed testsnot documentednot found in the project's documentation as of
CI integrationIntegration guides for GitHub Actions, GitLab, Jenkins, CircleCI, Azure Pipelines, TeamCity and others source: Docs: Integrations and toolsLighthouse CI, listed as the official project for running Lighthouse on every commit source: README
Report formatsEnd-of-test summary; CSV and JSON files; streaming to InfluxDB, Prometheus remote write, Datadog, OpenTelemetry and others source: Docs: Real timeJSON, HTML, CSV (HTML by default) source: README
Install methodPackages for Linux, macOS and Windows (apt, dnf, brew, winget); Docker image grafana/k6; standalone binary source: Docs: Install k6npm (npm install -g lighthouse) or yarn; also a Chrome DevTools panel source: README

1 Fetched from the GitHub or GitLab API on . Hover a value for its own date.

When each fits

Written from each project's documented scope, not from preference. Neither tool is ranked.

k6

Fits projects that load test services with test scripts kept as code; its README describes scripts that run on the CLI, in CI or across a Kubernetes cluster. source: README

Lighthouse

Fits projects that analyze web apps and web pages; its README describes audit categories for accessibility, performance and SEO, among others. source: README

More on these tools

Sources

  1. GitHub REST API: repository, read
  2. GitHub REST API: repository, read
  3. GitHub REST API: contributors, read
  4. GitHub REST API: contributors, read
  5. GitHub REST API: latest release, read
  6. GitHub REST API: latest release, read
  7. GitHub REST API: commits, read
  8. GitHub REST API: commits, read
  9. README, read
  10. README, read
  11. Docs: Running distributed tests, read
  12. Docs: Integrations and tools, read
  13. Docs: Real time, read
  14. Docs: Install k6, read

Documented facts collected 2026-09-22. See the methodology for how metrics and facts are gathered.