Softwr

Testing · head to head

k6 vs Matomo

k6 logo

k6

Testing

Load testing tool with JavaScript tests on a Go runtime, now owned by Grafana Labs

From
Free
Rated
-
Full reviewWebsite
Matomo logo

Matomo

Marketing

Privacy-focused web analytics

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: k6 tests run on a JavaScript engine embedded in Go rather than on Node.js, so npm packages, Node built-ins and existing shared test utilities generally do not work without being bundled to plain JavaScript, and often not even then.; Matomo the self hosted Community Edition is free but excludes A/B testing, heatmaps, session recording, cohorts, crash analytics and multi channel attribution, all of which are paid plugins
  • They diverge on capability: k6 covers JavaScript test scripts, Matomo covers Web analytics.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which k6 and Matomo actually diverge.

Attributes where k6 and Matomo differ
Attributek6Matomo
Pricing modelOpen source, no licence feefreemium
PlatformsWindows, macOS, Linux, Docker, KubernetesWeb, On-premise
CategoryTestingMarketing
FoundedUnknown2007

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in k6

  • JavaScript test scripts
  • Thresholds and checks
  • Protocol coverage
  • Browser module
  • Executors
  • xk6 extensions
  • Metrics output
  • Kubernetes operator

Only in Matomo

  • Web analytics
  • Real-time reports
  • Custom dimensions
  • Goal tracking
  • E-commerce tracking
  • Google Search Console
  • Privacy-focused
  • Cloud deployment

What people use each for

The jobs each tool is most often brought in to do.

k6

  • Gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival ratenot Matomo
  • Generating tens of thousands of requests per second from a small number of machines without a load generator fleetnot Matomo
  • Testing gRPC and WebSocket services with the same tooling and thresholds used for HTTP endpointsnot Matomo
  • Correlating a load test against existing dashboards for an organisation already running Grafana and Prometheusnot Matomo

Matomo

  • Privacy focused web analytics as an alternative to Google Analyticsnot k6
  • Self hosting analytics so visitor data stays on owned infrastructurenot k6

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

k6

  • Tests run on a JavaScript engine embedded in Go rather than on Node.js, so npm packages, Node built-ins and existing shared test utilities generally do not work without being bundled to plain JavaScript, and often not even then.
  • The open source binary runs on a single machine, so distributed load requires the Kubernetes operator or the cloud service, and the operator is infrastructure your team has to run and debug.
  • The AGPL-3.0 licence on the core requires legal review at any company that intends to embed k6 in a product it distributes or offers as a service, which is a slower path than a permissively licensed tool.
  • There is no result storage in the open source tool, so trend history means standing up Prometheus, InfluxDB or Grafana Cloud before load testing produces anything comparable over time.
  • Since the Grafana Labs acquisition the roadmap serves the Grafana observability stack, so a buyer choosing k6 as a standalone tool should expect the standalone experience to receive less investment than the cloud and dashboard integration.
  • Grafana Cloud billing is by virtual user hour, so a long soak test at modest concurrency costs far more than its peak load suggests, and cost planning has to be done in virtual user hours rather than in test runs.

Matomo

  • The self hosted Community Edition is free but excludes A/B testing, heatmaps, session recording, cohorts, crash analytics and multi channel attribution, all of which are paid plugins
  • Premium plugin bundles for self hosted installs run from 275 EUR a month for 4 users to 3,400 EUR for 50
  • Cloud pricing is banded by monthly hits, and anything above 10 million requires contacting sales
  • Self hosting places all operation and upgrades on the operator while still needing paid plugins for the advanced features

Pricing, plan by plan

k6

Free
  • k6 OSSFree
    • AGPL-3.0 licence
    • Full test engine, no virtual user limits
    • Runs on one machine unless distributed yourself
  • Grafana Cloud free tierFree
    • Includes a monthly allowance of virtual user hours
    • Hosted test results and dashboards
    • Shared with the rest of the Grafana Cloud free tier
  • Grafana Cloud k6$undefined/month
    • Billed by virtual user hours consumed
    • Load generation from multiple regions
    • Retained test history and comparison

Matomo

Free
  • Self-hostedFree
    • Open-source
    • Full analytics
    • Privacy-focused

Which should you pick?

Choose k6 if

  • You need javascript test scripts.
  • You want to start without paying.
  • You work on Windows, macOS, Linux, Docker, Kubernetes.
  • You also want thresholds and checks.
k6 review

Choose Matomo if

  • You need web analytics.
  • You want to start without paying.
  • You work on Web, On-premise.
  • You also want real-time reports.
Matomo review

Questions people ask

Is k6 or Matomo better?
Neither clearly leads. k6 starts at Free and Matomo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, k6 or Matomo?
k6 starts at Free and Matomo at Free.
Does k6 or Matomo run on more platforms?
k6 runs on Windows, macOS, Linux, Docker, Kubernetes. Matomo runs on Web, On-premise.
Can I use k6 for free?
Both have a free tier, so you can try either at no cost before committing.
What is k6 best used for?
k6 is most often used for gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival rate, generating tens of thousands of requests per second from a small number of machines without a load generator fleet, testing grpc and websocket services with the same tooling and thresholds used for http endpoints, correlating a load test against existing dashboards for an organisation already running grafana and prometheus. Of those, gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival rate and generating tens of thousands of requests per second from a small number of machines without a load generator fleet are not what Matomo is typically brought in for.
What can k6 do that Matomo cannot?
k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module. Matomo covers Web analytics, Real-time reports, Custom dimensions, Goal tracking.

Answered from the vendors’ own pages

k6: Can I use npm packages in a k6 test?

Usually not. Scripts run on a Go-embedded JavaScript engine with no Node.js runtime, so packages depending on Node built-ins fail and pure JavaScript libraries must be bundled first.

Matomo: How much does Matomo cost?

Matomo Cloud starts at EUR 29 per month for the Starter plan, which covers 50,000 hits per month. Matomo On-Premise has a free Community edition, with paid bundles from EUR 275 per month for up to 5M hits and 4 users.

Source
k6: Is k6 free?

The core tool is free under AGPL-3.0 with no virtual user limits. Grafana Cloud k6 is a paid service billed by virtual user hours, with a free monthly allowance.

Matomo: Is Matomo free?

The On-Premise Community edition is free forever with unlimited users and hits, supported through the forum only. Matomo Cloud is a paid service, though a free trial with access to all core features is offered.

Source
k6: Does the Grafana acquisition affect the open source tool?

The tool remains open source and maintained, but investment is directed at making it a data source for Grafana, so standalone use is supported rather than prioritised.

Matomo: What is the difference between Matomo Cloud and On-Premise?

Cloud plans include hosting, maintenance, automatic updates and daily backups, priced by monthly hits from EUR 29. On-Premise is self-hosted, free in its Community edition, with paid bundles adding support and higher user counts.

Source
k6: Can k6 replace a browser testing tool?

No. The browser module measures page-level metrics under load, but functional browser testing belongs in Playwright or a similar tool.

Matomo: How many hits do the Matomo On-Premise bundles cover?

The Team bundle covers up to 5M hits per month and 4 users at EUR 275 per month. Business covers up to 30M hits and 20 users at EUR 1,450. Enterprise covers up to 100M hits and 50 users at EUR 3,400.

Source
Share

Related pages

More on k6

More on Matomo

Keep looking

Other head to heads