Is Cypress or k6 better?

Neither clearly leads. Cypress 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, Cypress or k6?

Cypress starts at Free and k6 at Free.

Does Cypress or k6 run on more platforms?

Cypress runs on macOS, Windows, Linux. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.

Can I use Cypress for free?

Both have a free tier, so you can try either at no cost before committing.

What is Cypress best used for?

Cypress is most often used for end-to-end testing for modern javascript web applications, continuous integration pipelines with parallelised test execution, visual regression testing and accessibility verification, flaky test detection and elimination. Of those, end-to-end testing for modern javascript web applications and continuous integration pipelines with parallelised test execution are not what k6 is typically brought in for.

What can Cypress do that k6 cannot?

k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.

Testing · head to head

Cypress vs k6

Cypress

Testing

JavaScript end-to-end testing framework with browser-based runner and cloud service

From: Free
Rated: -

Full review Website

k6

Testing

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

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Cypress limited to web applications; mobile and desktop app testing not supported; 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.
Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Cypress and k6 actually diverge.

Attributes where Cypress and k6 differ
Attribute	Cypress	k6
Pricing model	freemium	Open source, no licence fee
Platforms	macOS, Windows, Linux	Windows, macOS, Linux, Docker, Kubernetes

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

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 Cypress

Nothing recorded that k6 does not also cover.

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.

Cypress

End-to-end testing for modern JavaScript web applicationsnot k6
Continuous integration pipelines with parallelised test executionnot k6
Visual regression testing and accessibility verificationnot k6
Flaky test detection and eliminationnot k6
Team collaboration on test maintenance and debuggingnot k6

k6

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

Where each one falls short

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

Cypress

Limited to web applications; mobile and desktop app testing not supported
Free tier capped at 500 test results/month; insufficient for most development teams
Paid features (flake detection, analytics) not included in free tier
JavaScript/TypeScript focused; less suitable for polyglot organisations

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

Cypress

Free

Starter (Free)Free
- 500 test results/month
- 100 prompt executions/month
- Parallelisation
Team$67/month
- 120k test results/year
- 9k prompt executions/year
- Flake detection
Business$267/month
- 120k test results/year
- 24k prompt executions/year
- Spec prioritisation
Enterprise$undefined/custom
- 1.8M test results/year
- 60k prompt executions/year
- Unlimited users

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 Cypress if

You want to start without paying.
You work on macOS, Windows, Linux.

Cypress 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 Cypress or k6 better?: Neither clearly leads. Cypress 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, Cypress or k6?: Cypress starts at Free and k6 at Free.
Does Cypress or k6 run on more platforms?: Cypress runs on macOS, Windows, Linux. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.
Can I use Cypress for free?: Both have a free tier, so you can try either at no cost before committing.
What is Cypress best used for?: Cypress is most often used for end-to-end testing for modern javascript web applications, continuous integration pipelines with parallelised test execution, visual regression testing and accessibility verification, flaky test detection and elimination. Of those, end-to-end testing for modern javascript web applications and continuous integration pipelines with parallelised test execution are not what k6 is typically brought in for.
What can Cypress do that k6 cannot?: k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.

Answered from the vendors’ own pages

Cypress: Is Cypress free?

Yes, Cypress offers a free Starter plan with 500 test results per month, 100 prompt executions monthly, 50 users, and 30-day data retention. No credit card is required.

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.

Cypress: How much does Cypress Team cost?

Cypress Team costs $67 per month when billed monthly or $799 per year for annual billing (11% savings). It includes 120,000 annual test results, 9,000 yearly prompt executions, 50 users, 90-day data retention, flake detection, Jira integration, and email support.

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.

Cypress: What is the difference between Cypress Team and Business?

Cypress Business costs $267 per month (or $3,199 annually) compared to Team's $67/month ($799/year). Business provides twice the prompt executions (24,000 vs. 9,000 yearly), spec prioritization, auto-cancellation, and enterprise GitHub/GitLab support.

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.

Cypress: Can I purchase additional test results on Cypress?

Yes, Cypress allows purchasing bundled on-demand test results. Team costs $6 per 1,000 results, Business costs $5 per 1,000, and Enterprise pricing is custom. Open-source projects qualify for complimentary cloud services.

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.

Cypress vs k6

Cypress

k6

The short version

Where they differ

What each one covers

Only in Cypress

Only in k6

What people use each for

Cypress

k6

Where each one falls short

Cypress

k6

Pricing, plan by plan

Cypress

k6

Which should you pick?

Choose Cypress if

Choose k6 if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Cypress

More on k6

Keep looking

Other head to heads