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APIs · head to head

Asyncapi vs authentik

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
authentik logo

authentik

Cybersecurity

Open-source identity provider with flexible authentication flows

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Asyncapi complex to implement and debug asynchronous operations due to their non-linear and concurrent nature; authentik smaller project than Keycloak, with a correspondingly smaller community and fewer integration guides
  • They diverge on capability: Asyncapi covers API Specification, authentik covers Configurable flows.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Asyncapi and authentik actually diverge.

Attributes where Asyncapi and authentik differ
AttributeAsyncapiauthentik
Pricing modelopen-sourceOpen-source core with a paid enterprise tier
PlatformsWeb, CLI, IDE ExtensionsDocker, Kubernetes, Linux, Self-hosted
CategoryAPIsCybersecurity
Founded2019Unknown

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 Asyncapi

  • API Specification
  • Code generation
  • Documentation
  • Multiple messaging protocols
  • Code generators
  • Specification support
  • Tools support
  • CLI support

Only in authentik

  • Configurable flows
  • Protocol support
  • Application proxy
  • Modern admin interface

What people use each for

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

Asyncapi

  • API Developmentnot authentik
  • API Gatewaynot authentik
  • API Testingnot authentik
  • API Documentationnot authentik
  • Microservicesnot authentik

authentik

  • Self-hosted SSO across internal services without commercial identity pricingnot Asyncapi
  • Putting authentication in front of applications that have none, via the proxynot Asyncapi
  • Teams who tried Keycloak and wanted something less heavynot Asyncapi

Where each one falls short

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

Asyncapi

  • Complex to implement and debug asynchronous operations due to their non-linear and concurrent nature
  • Keeping AsyncAPI documents up to date is challenging as systems evolve
  • Tracing and debugging asynchronous operations is more difficult than synchronous request-response patterns

authentik

  • Smaller project than Keycloak, with a correspondingly smaller community and fewer integration guides
  • The flow model is flexible but conceptually unfamiliar, and simple setups can feel over-abstracted
  • Enterprise support and some governance features sit behind the paid tier
  • Self-hosted identity is still yours to secure, patch and keep available

Pricing, plan by plan

Asyncapi

Free
  • Open SourceFree
    • AsyncAPI specification
    • Tools
    • Community support

authentik

Free
  • Open sourceFree
    • Full identity provider
    • All protocols
    • Community support

Which should you pick?

Choose Asyncapi if

  • You need api specification.
  • You want to start without paying.
  • You work on Web, CLI, IDE Extensions.
  • You also want code generation.
Asyncapi review

Choose authentik if

  • You need configurable flows.
  • You want to start without paying.
  • You work on Docker, Kubernetes, Linux, Self-hosted.
  • You also want protocol support.
authentik review

Questions people ask

Is Asyncapi or authentik better?
Neither clearly leads. Asyncapi starts at Free and authentik at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Asyncapi or authentik?
Asyncapi starts at Free and authentik at Free.
Does Asyncapi or authentik run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. authentik runs on Docker, Kubernetes, Linux, Self-hosted.
Can I use Asyncapi for free?
Both have a free tier, so you can try either at no cost before committing.
What is Asyncapi best used for?
Asyncapi is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what authentik is typically brought in for.
What can Asyncapi do that authentik cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. authentik covers Configurable flows, Protocol support, Application proxy, Modern admin interface.

Answered from the vendors’ own pages

Asyncapi: What is AsyncAPI used for?

AsyncAPI is an open-source specification for defining and documenting asynchronous APIs, message-driven systems, and event-driven architectures. It serves the same purpose for async APIs as OpenAPI does for REST APIs, providing standardized documentation, code generation, and tooling.

Source
authentik: Is authentik free?

The open-source edition is free and complete for most use. An enterprise tier adds support and additional features.

Asyncapi: Is AsyncAPI free to use?

Yes, AsyncAPI is completely free and open-source. It is hosted by the Linux Foundation and supported by community contributions and sponsorships from companies like Postman, IBM, IQVIA Technology, and Solace.

Source
authentik: authentik or Keycloak?

authentik is generally reported as easier to run and administer; Keycloak is more established with a larger community and Red Hat behind it.

Asyncapi: What protocols and technologies does AsyncAPI support?

AsyncAPI supports multiple protocols and technologies including Kafka, RabbitMQ, MQTT, Socket.IO, AWS EventBridge, and others. It provides language support for JavaScript/TypeScript, Python, Java, Go, C#/.NET, Kotlin, and PHP.

Source
authentik: Can authentik protect apps with no login of their own?

Yes. Its application proxy places authentication in front of services that have no built-in authentication.

Asyncapi: Does AsyncAPI have IDE support?

Yes, AsyncAPI has IDE extensions available for VSCode and IntelliJ, along with CLI utilities and GitHub Actions integration for developers.

Source
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