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containerd vs Ory Kratos

containerd logo

containerd

Cloud

Industry-standard container runtime, and the engine inside Docker

From
Free
Rated
-
Full reviewWebsite
Ory Kratos logo

Ory Kratos

Cybersecurity

Headless identity and user management API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: containerd not a developer-facing tool: there is no build command and the CLI is deliberately minimal, so it needs companions like nerdctl or Buildah; Ory Kratos headless means you build every screen, which is significant work compared with a hosted login page
  • They diverge on capability: containerd covers Full container lifecycle, Ory Kratos covers Headless API.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which containerd and Ory Kratos actually diverge.

Attributes where containerd and Ory Kratos differ
AttributecontainerdOry Kratos
Pricing modelOpen source, no licence feeOpen-source self-hosted, with a paid managed network
PlatformsLinux, WindowsLinux, Docker, Kubernetes, Self-hosted
CategoryCloudCybersecurity

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 containerd

  • Full container lifecycle
  • CRI support
  • OCI compliant
  • Snapshotter plugins
  • Namespaces
  • Stable API

Only in Ory Kratos

  • Headless API
  • Self-service flows
  • Multi-factor authentication
  • Pluggable identity schemas

What people use each for

The jobs each tool is most often brought in to do.

containerd

  • Running the container runtime under a Kubernetes cluster after the Docker shim removalnot Ory Kratos
  • Building a platform or PaaS that needs to execute containersnot Ory Kratos
  • Reducing the moving parts on nodes that only ever run Kubernetes workloadsnot Ory Kratos
  • Embedding container execution inside another productnot Ory Kratos

Ory Kratos

  • Products needing complete control over the look and flow of authenticationnot containerd
  • Applications that must not hand user identity data to a third partynot containerd
  • Teams building identity as infrastructure across several servicesnot containerd

Where each one falls short

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

containerd

  • Not a developer-facing tool: there is no build command and the CLI is deliberately minimal, so it needs companions like nerdctl or Buildah
  • Debugging is lower-level than Docker, and error messages assume knowledge of the runtime internals
  • Documentation is aimed at platform engineers, so newcomers usually find Docker or Podman material more useful
  • No image building at all — that is out of scope by design

Ory Kratos

  • Headless means you build every screen, which is significant work compared with a hosted login page
  • More moving parts than a monolithic IAM: Kratos handles identity, and OAuth2 needs Ory Hydra alongside
  • Documentation assumes real familiarity with identity concepts and is not a gentle introduction
  • Self-hosting identity carries the security and availability burden that hosted providers absorb

Pricing, plan by plan

containerd

Free
  • containerdFree
    • Full functionality
    • No usage limits
    • Community support

Ory Kratos

Free
  • Self-hostedFree
    • Full identity server
    • All flows
    • Community support

Which should you pick?

Choose containerd if

  • You need full container lifecycle.
  • You want to start without paying.
  • You work on Linux, Windows.
  • You also want cri support.
containerd review

Choose Ory Kratos if

  • You need headless api.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Self-hosted.
  • You also want self-service flows.
Ory Kratos review

Questions people ask

Is containerd or Ory Kratos better?
Neither clearly leads. containerd starts at Free and Ory Kratos at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, containerd or Ory Kratos?
containerd starts at Free and Ory Kratos at Free.
Does containerd or Ory Kratos run on more platforms?
containerd runs on Linux, Windows. Ory Kratos runs on Linux, Docker, Kubernetes, Self-hosted.
Can I use containerd for free?
Both have a free tier, so you can try either at no cost before committing.
What is containerd best used for?
containerd is most often used for running the container runtime under a kubernetes cluster after the docker shim removal, building a platform or paas that needs to execute containers, reducing the moving parts on nodes that only ever run kubernetes workloads, embedding container execution inside another product. Of those, running the container runtime under a kubernetes cluster after the docker shim removal and building a platform or paas that needs to execute containers are not what Ory Kratos is typically brought in for.
What can containerd do that Ory Kratos cannot?
containerd covers Full container lifecycle, CRI support, OCI compliant, Snapshotter plugins. Ory Kratos covers Headless API, Self-service flows, Multi-factor authentication, Pluggable identity schemas.

Answered from the vendors’ own pages

containerd: Is containerd free?

Yes. It is an open-source CNCF graduated project with no licence fee.

Ory Kratos: Is Ory Kratos free?

Yes, open source and free to self-host. Ory Network is a paid managed service.

containerd: Do I need containerd if I use Docker?

You already have it. Docker uses containerd underneath to run containers; it is not an alternative you install separately.

Ory Kratos: What does headless mean here?

Kratos provides identity flows as APIs and no user interface. You build the login, registration and recovery screens yourself.

containerd: Why did Kubernetes drop Docker for containerd?

Kubernetes talks to runtimes through the Container Runtime Interface. Docker did not speak CRI natively and needed a shim, so Kubernetes removed the shim and talks to containerd directly, which Docker was already using anyway.

Ory Kratos: Does Kratos do OAuth2?

No. Kratos handles user identity; OAuth2 and OpenID Connect provider functionality is Ory Hydra, a separate component.

containerd: Can containerd build images?

No. Image building is deliberately out of scope. Tools such as Buildah, BuildKit or Docker handle that.

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