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APIs · head to head

GraphQL Playground vs k6

GraphQL Playground logo

GraphQL Playground

APIs

GraphQL IDE and documentation tool for building GraphQL APIs

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: GraphQL Playground apollo's own documentation states GraphQL Playground is officially retired and no longer recommended, directing users to Apollo Sandbox instead; 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: GraphQL Playground covers Query building, k6 covers JavaScript test scripts.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which GraphQL Playground and k6 actually diverge.

Attributes where GraphQL Playground and k6 differ
AttributeGraphQL Playgroundk6
Pricing modelopen-sourceOpen source, no licence fee
PlatformsWeb, Electron, Self-hostedWindows, macOS, Linux, Docker, Kubernetes
CategoryAPIsTesting
Founded2018Unknown

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 GraphQL Playground

  • Query building
  • Schema introspection
  • Real-time testing
  • GraphQL servers
  • Apollo Studio
  • Custom servers
  • Web support
  • Electron 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.

GraphQL Playground

  • API Developmentnot k6
  • API Gatewaynot k6
  • API Testingnot k6
  • API Documentationnot k6
  • Microservicesnot k6

k6

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

Where each one falls short

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

GraphQL Playground

  • Apollo's own documentation states GraphQL Playground is officially retired and no longer recommended, directing users to Apollo Sandbox instead

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

GraphQL Playground

Free
  • Open SourceFree
    • Full GraphQL IDE
    • Community support

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 GraphQL Playground if

  • You need query building.
  • You want to start without paying.
  • You work on Web, Electron, Self-hosted.
  • You also want schema introspection.
GraphQL Playground 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 GraphQL Playground or k6 better?
Neither clearly leads. GraphQL Playground 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, GraphQL Playground or k6?
GraphQL Playground starts at Free and k6 at Free.
Does GraphQL Playground or k6 run on more platforms?
GraphQL Playground runs on Web, Electron, Self-hosted. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.
Can I use GraphQL Playground for free?
Both have a free tier, so you can try either at no cost before committing.
What is GraphQL Playground best used for?
GraphQL Playground is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what k6 is typically brought in for.
What can GraphQL Playground do that k6 cannot?
GraphQL Playground covers Query building, Schema introspection, Real-time testing, GraphQL servers. k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.

Answered from the vendors’ own pages

GraphQL Playground: Is GraphQL Playground free to use?

GraphQL Playground is a testing tool for Apollo Server and is free to use as part of the Apollo Server documentation. However, the broader Apollo GraphQL platform has various paid tiers available for production use.

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.

GraphQL Playground: Is GraphQL Playground part of a paid product?

GraphQL Playground is a testing tool within the Apollo ecosystem. While Playground itself is free, Apollo offers paid tiers starting at $5 per million requests for the Developer tier, with Standard and Enterprise plans available at custom pricing.

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.

GraphQL Playground: What is the cost structure for Apollo GraphQL's paid plans?

Apollo uses volume-based tiered pricing for requests: first 250M operations cost $5.00 per million plus $2.00 for performance add-on; next 750M operations are $4.25 per million plus $1.50 add-on; additional tiers scale down to $3.00 per million plus $0.50 add-on for operations over 5 billion.

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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