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API Management · head to head

Asyncapi vs Census

Asyncapi logo

Asyncapi

API Management

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
Census logo

Census

Automation & Integration

The reverse ETL infrastructure for data activation

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; Census census was folded into Fivetran Activations, per the vendor: "Previously, this was called a sync in Census", and its own pricing page redirects to Fivetran pricing rather than showing Census plans
  • They diverge on capability: Asyncapi covers API Specification, Census covers Reverse ETL.

Where they differ

Only the attributes on which Asyncapi and Census actually diverge.

Attributes where Asyncapi and Census differ
AttributeAsyncapiCensus
Pricing modelopen-sourceusage-based
PlatformsWeb, CLI, IDE ExtensionsWeb, Api
CategoryAPI ManagementAutomation & Integration
Founded20192020

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 Census

  • Reverse ETL
  • Data syncing
  • Transformation
  • Real-time activation
  • Error handling
  • Monitoring
  • Analytics
  • 150+ destinations

What people use each for

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

Asyncapi

  • API Developmentnot Census
  • API Gatewaynot Census
  • API Testingnot Census
  • API Documentationnot Census
  • Microservicesnot Census

Census

  • Syncing customer data from a warehouse into marketing and sales tools (reverse ETL)not 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

Census

  • Census was folded into Fivetran Activations, per the vendor: "Previously, this was called a sync in Census", and its own pricing page redirects to Fivetran pricing rather than showing Census plans
  • Free Fivetran Activations tier caps at 3,500 monthly active rows

Pricing, plan by plan

Asyncapi

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

Census

Free
  • FreeFree
    • Basic syncing
    • Limited destinations
  • Pro$250/month
    • Advanced syncing
    • Email support
  • Enterprise$1500/month
    • Unlimited syncing
    • Dedicated 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 Census if

  • You need reverse etl.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want data syncing.
Census review

Questions people ask

Is Asyncapi or Census better?
Neither clearly leads. Asyncapi starts at Free and Census at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Asyncapi or Census?
Asyncapi starts at Free and Census at Free.
Does Asyncapi or Census run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. Census runs on Web, Api.
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 Census is typically brought in for.
What can Asyncapi do that Census cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Census covers Reverse ETL, Data syncing, Transformation, Real-time activation.

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
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Related pages

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