Testing · head to head
k6 vs Penpot
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: 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.; Penpot smaller user base and community compared to Figma means fewer templates and resources
- They diverge on capability: k6 covers JavaScript test scripts, Penpot covers Vector editing.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which k6 and Penpot actually diverge.
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 Penpot
- Vector editing
- Interactive prototyping
- Design systems
- Components & libraries
- Real-time collaboration
- SVG support
- CSS Grid & Flexbox
- Code export
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 Penpot
- Generating tens of thousands of requests per second from a small number of machines without a load generator fleetnot Penpot
- Testing gRPC and WebSocket services with the same tooling and thresholds used for HTTP endpointsnot Penpot
- Correlating a load test against existing dashboards for an organisation already running Grafana and Prometheusnot Penpot
Penpot
- UI/UX designnot k6
- Prototypingnot k6
- Design systemsnot k6
- Developer handoffnot k6
- Open source projectsnot 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.
Penpot
- Smaller user base and community compared to Figma means fewer templates and resources
- Self-hosting requires Linux server and Docker knowledge for technical setup
- Real-time collaboration features may have performance issues with very large design files
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
Penpot
Free- FreeFree
- Cloud-based design
- Real-time collaboration
- Components and variants
- Unlimited$7/month
- All free features
- Priority support
- Advanced cloud features
- Enterprise$950/month
- Custom enterprise features
- Dedicated support
- Advanced security
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.
Choose Penpot if
- You need vector editing.
- You want to start without paying.
- You work on Web, Windows, macOS, Linux.
- You also want interactive prototyping.
Questions people ask
- Is k6 or Penpot better?
- Neither clearly leads. k6 starts at Free and Penpot at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, k6 or Penpot?
- k6 starts at Free and Penpot at Free.
- Does k6 or Penpot run on more platforms?
- k6 runs on Windows, macOS, Linux, Docker, Kubernetes. Penpot runs on Web, Windows, macOS, Linux.
- 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 Penpot is typically brought in for.
- What can k6 do that Penpot cannot?
- k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module. Penpot covers Vector editing, Interactive prototyping, Design systems, Components & libraries.
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.
Penpot: Is Penpot really free?
Yes. Penpot is completely free with no feature gates. The open-source version can be self-hosted on your own infrastructure for zero cost beyond server expenses.
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.
Penpot: Can I self-host Penpot?
Yes. Penpot can be self-hosted on your own infrastructure with no licensing costs. Organizations with specific privacy or governance needs can run Penpot on their own servers.
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.
Penpot: What are the paid plans if I use Penpot cloud?
Penpot's cloud service offers a free tier, Unlimited plan at $7 per user per month for professionals and medium teams, and Enterprise starting at $950 per month for larger organizations.
Sourcek6: 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.
Penpot: What platforms does Penpot support?
Penpot runs in the browser, so it works on Windows, Mac, Linux, and any OS with a web browser. No platform-specific downloads required.
SourceRelated pages
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