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Marketing · head to head

Countly vs k6

Countly logo

Countly

Marketing

Product analytics for mobile and web

From
Free
Rated
-
Full reviewWebsite
k6 logo

k6

Testing

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

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Countly the private cloud plan starts at $175 a month and is described as usage based without stating the unit; 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.
  • They diverge on capability: Countly covers Event tracking, k6 covers JavaScript test scripts.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Countly and k6 actually diverge.

Attributes where Countly and k6 differ
AttributeCountlyk6
Pricing modelsubscriptionOpen source, no licence fee
PlatformsWeb, Mobile, ApiWindows, macOS, Linux, Docker, Kubernetes
CategoryMarketingTesting
Founded2012Unknown

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 Countly

  • Event tracking
  • Crash reporting
  • Analytics dashboard
  • User retention
  • Open-source
  • Cloud deployment
  • On-premise deployment
  • Web support

Only in k6

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

What people use each for

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

Countly

  • Product analytics for mobile and web applicationsnot k6
  • Self hosting analytics where data cannot leave the organisationnot k6

k6

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

Where each one falls short

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

Countly

  • The private cloud plan starts at $175 a month and is described as usage based without stating the unit
  • No event cap, data point limit or user limit is published for either paid plan
  • The self hosted Enterprise edition is custom priced and billed annually
  • Adaptivity and intelligence features are separately priced add ons on the cheaper plan

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.

Pricing, plan by plan

Countly

Free
  • Flex (Private Cloud)$175/month
    • Usage-based pricing (not seat-based)
    • Advanced Analytics included
    • Adaptivity and Intelligence available as add-ons
  • Enterprise (Self-Hosted)$null/mo
    • Custom pricing, requires demo booking
    • All capabilities included
    • Deploy on your infrastructure

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

Which should you pick?

Choose Countly if

  • You need event tracking.
  • You want to start without paying.
  • You work on Web, Mobile, Api.
  • You also want crash reporting.
Countly review

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

Questions people ask

Is Countly or k6 better?
Neither clearly leads. Countly starts at Free and k6 at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Countly or k6?
Countly starts at Free and k6 at Free.
Does Countly or k6 run on more platforms?
Countly runs on Web, Mobile, Api. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.
Can I use Countly for free?
Both have a free tier, so you can try either at no cost before committing.
What is Countly best used for?
Countly is most often used for product analytics for mobile and web applications, self hosting analytics where data cannot leave the organisation. Of those, product analytics for mobile and web applications and self hosting analytics where data cannot leave the organisation are not what k6 is typically brought in for.
What can Countly do that k6 cannot?
Countly covers Event tracking, Crash reporting, Analytics dashboard, User retention. k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.

Answered from the vendors’ own pages

Countly: How much does Countly cost?

Countly's Flex plan (private cloud) starts at $175/month with pay-as-you-go cancellation. Enterprise (self-hosted) requires custom pricing and annual billing. Both plans include advanced analytics, and Flex offers a 14-day free trial.

Source
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.

Countly: What is the difference between Countly Flex and Enterprise plans?

Flex uses usage-based pricing on Countly's cloud with monthly billing. Enterprise requires custom pricing and annual billing, but allows self-hosting on your infrastructure with zero vendor access to data, dedicated support, and included SLA.

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.

Countly: Can I add Adaptivity and Intelligence to Countly Flex?

Yes, Adaptivity and Intelligence suites can be added to Flex as needed. Both are included standard with Enterprise plans.

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.

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.

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