Testing · head to head
GitHub Actions vs k6
k6
Testing
Load testing tool with JavaScript tests on a Go runtime, now owned by Grafana Labs
- From
- Free
- Rated
- -
The short version
- Each has a real cost: GitHub Actions private repository usage is capped at 2,000 minutes per month on GitHub Free and 3,000 on Pro and Team, with anything beyond billed; 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 GitHub Actions and k6 actually diverge.
| Attribute | GitHub Actions | k6 |
|---|---|---|
| Pricing model | subscription | Open source, no licence fee |
| Platforms | Web | Windows, macOS, Linux, Docker, Kubernetes |
| Founded | 2008 | Unknown |
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 GitHub Actions
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.
GitHub Actions
- Running CI builds and tests on pushes and pull requestsnot k6
- Automating releases, container image builds and deployments from a repositorynot k6
- Scheduled maintenance jobs and repository automationnot k6
k6
- Gating a deployment pipeline on a threshold such as 95th percentile latency under a defined arrival ratenot GitHub Actions
- Generating tens of thousands of requests per second from a small number of machines without a load generator fleetnot GitHub Actions
- Testing gRPC and WebSocket services with the same tooling and thresholds used for HTTP endpointsnot GitHub Actions
- Correlating a load test against existing dashboards for an organisation already running Grafana and Prometheusnot GitHub Actions
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
GitHub Actions
- Private repository usage is capped at 2,000 minutes per month on GitHub Free and 3,000 on Pro and Team, with anything beyond billed
- Artifact storage is only 500 MB on GitHub Free and 2 GB on Team, and it is shared with GitHub Packages storage
- Larger runners are always charged for, even on public repositories and even when plan quota remains
- Windows runners cost $0.010 per minute against $0.006 for a 2-core Linux runner, so the same workflow costs more per platform
- macOS runners are charged at a higher per-minute rate than Linux runners
- Failed runs consume minutes, so a job that fails after 5 minutes and is re-run for 10 uses 15 minutes of quota
- Storage is billed on hourly accrual in GB-Hours, so deleting artifacts stops future charges but does not remove charges already accrued in the cycle
- Cache storage is a separate 10 GB per repository allowance and peak hourly usage above it is charged
- Minutes are charged to the repository owner, not the person who triggered the run, and anyone with write access can trigger runs
- Without a valid payment method on file, workflows are blocked as soon as the quota is exhausted
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
GitHub Actions
Free- FreeFree
- 2,000 CI/CD minutes per month
- Free for public repositories
- Team$4/month
- 3,000 CI/CD minutes per month
- Free for public repositories
- First 12 months at promotional rate
- Enterprise$21/month
- 50,000 CI/CD minutes per month
- Free for public repositories
- First 12 months at promotional rate
k6
Free- k6 OSSFree
- AGPL-3.0 licence
- Full test engine, no virtual user limits
- Runs on one machine unless distributed yourself
- Grafana Cloud free tierFree
- Includes a monthly allowance of virtual user hours
- Hosted test results and dashboards
- Shared with the rest of the Grafana Cloud free tier
- Grafana Cloud k6$undefined/month
- Billed by virtual user hours consumed
- Load generation from multiple regions
- Retained test history and comparison
Which should you pick?
Choose 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.
Questions people ask
- Is GitHub Actions or k6 better?
- Neither clearly leads. GitHub Actions 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, GitHub Actions or k6?
- GitHub Actions starts at Free and k6 at Free.
- Does GitHub Actions or k6 run on more platforms?
- GitHub Actions runs on Web. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.
- Can I use GitHub Actions for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is GitHub Actions best used for?
- GitHub Actions is most often used for running ci builds and tests on pushes and pull requests, automating releases, container image builds and deployments from a repository, scheduled maintenance jobs and repository automation. Of those, running ci builds and tests on pushes and pull requests and automating releases, container image builds and deployments from a repository are not what k6 is typically brought in for.
- What can GitHub Actions do that k6 cannot?
- k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.
Answered from the vendors’ own pages
GitHub Actions: How much does GitHub Actions cost?
GitHub Actions is free for public repositories. For private repositories, the Team plan costs $4 per user per month (first 12 months) with 3,000 CI/CD minutes, and the Enterprise plan costs $21 per user per month (first 12 months) with 50,000 CI/CD minutes.
Sourcek6: 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.
GitHub Actions: Is there a free version of GitHub Actions?
Yes, GitHub Actions is free for all public repositories. The Free plan for private repositories includes 2,000 CI/CD minutes per month. All tiers include free CI/CD minutes for public repository workflows.
Sourcek6: 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.
GitHub Actions: What does the Team plan add to GitHub Actions?
The Team plan provides 3,000 CI/CD minutes per month compared to 2,000 on the Free plan. It costs $4 per user per month for the first 12 months. Minutes apply only to private repository workflows.
Sourcek6: 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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