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Software · head to head

Kong vs Asyncapi

Kong logo

Kong

Software

Cloud-native API gateway and service connectivity platform

From
Free
Rated
-
Full reviewWebsite
Asyncapi logo

Asyncapi

Software

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kong the Plus plan includes 1M API requests a month and charges $200 a month for each additional million; Asyncapi complex to implement and debug asynchronous operations due to their non-linear and concurrent nature
  • They diverge on capability: Kong covers API Gateway, Asyncapi covers API Specification.

Where they differ

Only the attributes on which Kong and Asyncapi actually diverge.

Attributes where Kong and Asyncapi differ
AttributeKongAsyncapi
PlatformsLinux, Docker, KubernetesWeb, CLI, IDE Extensions
Founded20102019

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), user rating (Not yet rated), category (Unknown).

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 Kong

  • API Gateway
  • Authentication & Authorization
  • Rate Limiting
  • Kubernetes
  • Consul
  • Eureka
  • PostgreSQL
  • Linux support

Only in Asyncapi

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

What people use each for

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

Kong

  • Running an API gateway in front of internal and public servicesnot Asyncapi
  • Publishing and governing APIs through a developer portalnot Asyncapi

Asyncapi

  • API Developmentnot Kong
  • API Gatewaynot Kong
  • API Testingnot Kong
  • API Documentationnot Kong
  • Microservicesnot Kong

Where each one falls short

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

Kong

  • The Plus plan includes 1M API requests a month and charges $200 a month for each additional million
  • Plus is capped at 10M requests a month, so growth past that forces an Enterprise contract
  • Plus limits published APIs to 20 and includes one Developer Portal, with a second at $200 a month
  • SSO and audit logging are Enterprise only
  • Enterprise pricing is custom and billed annually

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

Pricing, plan by plan

Kong

Free
  • CommunityFree
    • Core API gateway
    • Community support
  • Enterprise$undefined/monthly
    • Advanced features
    • Priority support
    • SLA

Asyncapi

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

Which should you pick?

Choose Kong if

  • You need api gateway.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes.
  • You also want authentication & authorization.
Kong review

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

Questions people ask

Is Kong or Asyncapi better?
Neither clearly leads. Kong starts at Free and Asyncapi at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kong or Asyncapi?
Kong starts at Free and Asyncapi at Free.
Does Kong or Asyncapi run on more platforms?
Kong runs on Linux, Docker, Kubernetes. Asyncapi runs on Web, CLI, IDE Extensions.
Can I use Kong for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kong best used for?
Kong is most often used for running an api gateway in front of internal and public services, publishing and governing apis through a developer portal. Of those, running an api gateway in front of internal and public services and publishing and governing apis through a developer portal are not what Asyncapi is typically brought in for.
What can Kong do that Asyncapi cannot?
Kong covers API Gateway, Authentication & Authorization, Rate Limiting, Kubernetes. Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols.

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
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
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
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

Related pages

More on Kong

More on Asyncapi

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