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APIs · head to head

Asyncapi vs Column

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
Column logo

Column

APIs

A nationally chartered US bank that ships its own API, with no middleware in between

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Asyncapi has a free tier, so it costs nothing to try first.
  • Each has a real cost: Asyncapi complex to implement and debug asynchronous operations due to their non-linear and concurrent nature; Column column publishes no pricing whatsoever, so there is no way to model cost before a sales process, and terms are negotiated per programme which favours larger, more sophisticated buyers.
  • They diverge on capability: Asyncapi covers API Specification, Column covers National bank charter.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Asyncapi and Column actually diverge.

Attributes where Asyncapi and Column differ
AttributeAsyncapiColumn
Starting priceFreeOn request
Pricing modelopen-sourcequote
Free tierYesNo
PlatformsWeb, CLI, IDE ExtensionsWeb, API
Founded2019Unknown

Identical on both: user rating (Not yet rated), category (APIs).

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 Column

  • National bank charter
  • Direct Federal Reserve access
  • Ledger and accounts
  • International wires
  • Real-time payments
  • Lending
  • Cheque handling
  • Correspondent banking

What people use each for

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

Asyncapi

  • API Developmentnot Column
  • API Gatewaynot Column
  • API Testingnot Column
  • API Documentationnot Column
  • Microservicesnot Column

Column

  • A fintech that has been burned by a middleware provider failing and wants its deposits held by the same entity that provides the APInot Asyncapi
  • A payments company needing direct Fedwire and Swift access rather than routing through a correspondent it cannot seenot Asyncapi
  • A lender that wants origination, funding and deposit accounts from one chartered institution instead of three counterpartiesnot Asyncapi
  • A payroll or treasury platform where same-day settlement certainty matters more than fast onboardingnot 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

Column

  • Column publishes no pricing whatsoever, so there is no way to model cost before a sales process, and terms are negotiated per programme which favours larger, more sophisticated buyers.
  • Onboarding is bank diligence rather than vendor sign-up, and programmes routinely spend several months on compliance review, flow of funds documentation and volume forecasting before the first live transaction.
  • Column selects its customers and declines many, so the charter advantage is only available to programmes it considers acceptable risk, which excludes most early-stage teams.
  • It is United States only, so any programme with international account or local payment needs must add a second banking relationship and reconcile across both.
  • Being the bank means Column also carries the bank's regulatory constraints, so product changes that affect risk, such as new customer segments or higher-risk flows, need approval rather than a configuration change.

Pricing, plan by plan

Asyncapi

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

Column

On request
  • Column Bank Platform$undefined/year
    • Deposit accounts and ledger
    • ACH, wire, RTP and cheque rails
    • International wires over Swift

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 Column if

  • You need national bank charter.
  • You work on Web, API.
  • You also want direct federal reserve access.
Column review

Questions people ask

Is Asyncapi or Column better?
Neither clearly leads. Asyncapi starts at Free and Column at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Asyncapi or Column?
Asyncapi has a free tier; the other does not. Paid plans start at Free for Asyncapi and On request for Column.
Does Asyncapi or Column run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. Column runs on Web, API.
Can I use Asyncapi for free?
Yes. Asyncapi has a free tier, so you can try it without paying. Column starts at On request.
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 Column is typically brought in for.
What can Asyncapi do that Column cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Column covers National bank charter, Direct Federal Reserve access, Ledger and accounts, International wires.

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
Column: Is Column actually a bank?

Yes. It is a nationally chartered, FDIC-insured bank, which is why there is no sponsor bank behind it.

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
Column: How is that different from Synctera or Unit?

Those are technology providers that connect you to a separate sponsor bank. With Column the API provider and the depository institution are the same company.

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
Column: What does Column cost?

Nothing is published. Pricing is negotiated per programme.

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
Column: How long does onboarding take?

Expect months. This is bank-grade diligence on your compliance programme, not a vendor sign-up.

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