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APIs · head to head

Directus vs k6

Directus logo

Directus

APIs

Open-source data platform providing REST and 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: Directus free permissive use of the self hosted product is limited to organisations under $5M annual revenue with fewer than 50 employees, so crossing either threshold turns a free dependency into a paid licence; 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: Directus covers REST API, k6 covers JavaScript test scripts.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Directus and k6 actually diverge.

Attributes where Directus and k6 differ
AttributeDirectusk6
Pricing modelopen-sourceOpen source, no licence fee
PlatformsNode.js, Cloud, Self-hosted, DockerWindows, macOS, Linux, Docker, Kubernetes
CategoryAPIsTesting
Founded2014Unknown

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 Directus

  • REST API
  • GraphQL API
  • Database management
  • PostgreSQL
  • MySQL
  • SQLite
  • Webhooks
  • Node.js 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.

Directus

  • Wrapping an existing SQL database in a REST and GraphQL API with an admin interfacenot k6
  • Running a self hosted headless CMS over a schema you already ownnot k6

k6

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

Where each one falls short

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

Directus

  • Free permissive use of the self hosted product is limited to organisations under $5M annual revenue with fewer than 50 employees, so crossing either threshold turns a free dependency into a paid licence
  • The free Core tier is a hard limit of 3 seats, 25 collections and 5 flows
  • The Team plan is $499 a month billed annually, or $599 monthly, with extra seats at $50 each
  • Team caps collections at 50, expandable to 100, and flows at 20

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

Directus

Free
  • CommunityFree
    • Self-hosted Directus
    • Community support
  • Cloud$25/monthly
    • Managed cloud
    • Automatic updates
    • Backups

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 Directus if

  • You need rest api.
  • You want to start without paying.
  • You work on Node.js, Cloud, Self-hosted, Docker.
  • You also want graphql api.
Directus 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 Directus or k6 better?
Neither clearly leads. Directus 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, Directus or k6?
Directus starts at Free and k6 at Free.
Does Directus or k6 run on more platforms?
Directus runs on Node.js, Cloud, Self-hosted, Docker. k6 runs on Windows, macOS, Linux, Docker, Kubernetes.
Can I use Directus for free?
Both have a free tier, so you can try either at no cost before committing.
What is Directus best used for?
Directus is most often used for wrapping an existing sql database in a rest and graphql api with an admin interface, running a self hosted headless cms over a schema you already own. Of those, wrapping an existing sql database in a rest and graphql api with an admin interface and running a self hosted headless cms over a schema you already own are not what k6 is typically brought in for.
What can Directus do that k6 cannot?
Directus covers REST API, GraphQL API, Database management, PostgreSQL. k6 covers JavaScript test scripts, Thresholds and checks, Protocol coverage, Browser module.

Answered from the vendors’ own pages

Directus: What is Directus's pricing?

Directus Core is free and self-hosted. The Team tier costs $499/month (annual) or $599/month (rolling), including 10 user seats and cloud hosting at $99/month additional. Enterprise plans have custom pricing. Additional seats cost $50/month each.

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.

Directus: Can I use Directus for free?

Yes, Directus Core is completely free with 3 user seats, 25 Collections, 5 Flows, AI Assistant, and Advanced RBAC. Self-hosting is available at no cost.

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.

Directus: How many user seats does each Directus tier include?

Core includes 3 user seats, Team includes 10 SSO seats, and Enterprise includes custom SSO seat counts. Additional Team seats cost $50/seat per month.

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.

Directus: What happens to my monthly Directus plan if I switch?

Monthly plans are grandfathered for six months after switching, and annual plans are honored until renewal. Self-hosted licenses are handled case-by-case at renewal.

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.

Directus: Is there a free trial for Directus?

No trial period is mentioned. Users can start with the free Core tier immediately without a credit card.

Source
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