Softwr

Testing · head to head

k6 vs Mautic

k6 logo

k6

Testing

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

From
Free
Rated
-
Full reviewWebsite
Mautic logo

Mautic

Marketing

The main open source marketing automation platform, self-hosted and GPL licensed

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.; Mautic mautic depends on reliably scheduled cron jobs to process segments and send campaigns, and a misconfigured or silently failing schedule stops sends without an obvious error, which is the most common way Mautic deployments fail in production.
  • They diverge on capability: k6 covers JavaScript test scripts, Mautic covers Visual campaign builder.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which k6 and Mautic actually diverge.

Attributes where k6 and Mautic differ
Attributek6Mautic
PlatformsWindows, macOS, Linux, Docker, KubernetesWeb, Linux, Self-hosted, Docker
CategoryTestingMarketing

Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 Mautic

  • Visual campaign builder
  • Contact management and segmentation
  • Landing pages and forms
  • Lead scoring
  • Dynamic web content
  • Email builder and A/B testing
  • Self-hosted data control
  • No feature gating

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 Mautic
  • Generating tens of thousands of requests per second from a small number of machines without a load generator fleetnot Mautic
  • Testing gRPC and WebSocket services with the same tooling and thresholds used for HTTP endpointsnot Mautic
  • Correlating a load test against existing dashboards for an organisation already running Grafana and Prometheusnot Mautic

Mautic

  • A marketing agency running automation for many clients that cannot pass on per-contact SaaS pricing at scalenot k6
  • A European university or public body whose data protection position requires contact data to stay on infrastructure it controlsnot k6
  • A company with a list of several hundred thousand contacts where SaaS per-contact pricing has become the largest line in the marketing budgetnot k6
  • A team that needs to modify the automation logic itself, not just configure it, and wants source access to do sonot 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.

Mautic

  • Mautic depends on reliably scheduled cron jobs to process segments and send campaigns, and a misconfigured or silently failing schedule stops sends without an obvious error, which is the most common way Mautic deployments fail in production.
  • Email sending is not included: you must arrange, pay for and warm up your own sending infrastructure through Amazon SES, SendGrid or similar, and deliverability problems become entirely your problem with no vendor to escalate to.
  • Acquia owns the commercial descendant, Campaign Studio, and is the largest contributor, so the loudest commercial interest in the ecosystem benefits from a hosted product rather than from the self-hosted one being easy.
  • Upgrades between major versions have historically been disruptive, requiring database migrations and plugin compatibility checks, so a neglected instance can become expensive to bring current.
  • The interface and the reporting are noticeably behind commercial platforms, so marketing teams that came from HubSpot or ActiveCampaign will find everyday tasks slower and will need training.

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

Mautic

Free
  • Self-hosted communityFree
    • GPL licensed, no licence fee and no contact limits
    • All features included, no paid edition
    • You provide hosting, database, cron scheduling and email sending
  • Managed Mautic hosting$undefined/month
    • Third-party managed hosting listed by the project
    • Updates, backups and cron scheduling handled for you
    • Pricing varies by provider and is not set by the project

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 Mautic if

  • You need visual campaign builder.
  • You want to start without paying.
  • You work on Web, Linux, Self-hosted, Docker.
  • You also want contact management and segmentation.
Mautic review

Questions people ask

Is k6 or Mautic better?
Neither clearly leads. k6 starts at Free and Mautic at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, k6 or Mautic?
k6 starts at Free and Mautic at Free.
Does k6 or Mautic run on more platforms?
k6 runs on Windows, macOS, Linux, Docker, Kubernetes. Mautic runs on Web, Linux, Self-hosted, Docker.
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 Mautic is typically brought in for.
What can k6 do that Mautic cannot?
k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module. Mautic covers Visual campaign builder, Contact management and segmentation, Landing pages and forms, Lead scoring.

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.

Mautic: Is Mautic free?

Yes, GPL licensed with no licence fee and no contact limits. You pay for hosting, email sending and the staff time to maintain it.

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.

Mautic: Does Acquia own Mautic?

Acquia acquired the founding commercial entity in 2019 and sells Campaign Studio built on it, but the Mautic trademark sits with the Open Source Collective and the project is community governed.

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.

Mautic: What breaks most often?

Cron scheduling. If segment rebuilding and campaign triggers are not running on schedule, campaigns quietly stop sending with no alert.

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.

Mautic: Can it handle large contact lists?

Yes, but performance at several hundred thousand contacts depends on database tuning and queue configuration, which is work you must do yourself.

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