APIs · head to head
Asyncapi vs Skyflow
Skyflow
APIs
Data privacy vault that holds sensitive records outside your own systems
- From
- On request
- Rated
- -
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; Skyflow reported contracts near 195,000 US dollars a year with a platform fee before usage put this out of reach of early stage companies, which are precisely the ones whose architecture is still cheap to change.
- They diverge on capability: Asyncapi covers API Specification, Skyflow covers Tokenised storage.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Asyncapi and Skyflow actually diverge.
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 Skyflow
- Tokenised storage
- Polymorphic encryption
- Field level access policies
- Data residency
- Secure functions
- PCI scope reduction
- Detokenisation gateway
- Audit trail
What people use each for
The jobs each tool is most often brought in to do.
Asyncapi
- API Developmentnot Skyflow
- API Gatewaynot Skyflow
- API Testingnot Skyflow
- API Documentationnot Skyflow
- Microservicesnot Skyflow
Skyflow
- A fintech that wants card and bank account data out of its own infrastructure so its application servers leave PCI DSS assessment scopenot Asyncapi
- A company entering India or the EU with data localisation obligations that would otherwise require standing up regional databases and operationsnot Asyncapi
- A health technology business that needs protected health information isolated from the analytics stack while still supporting aggregate reportingnot Asyncapi
- An engineering team that wants support agents to see masked identifiers and payment services to see real ones, enforced centrally rather than in every servicenot 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
Skyflow
- Reported contracts near 195,000 US dollars a year with a platform fee before usage put this out of reach of early stage companies, which are precisely the ones whose architecture is still cheap to change.
- Every read of a protected field becomes a network call to a third party, so latency and an external availability dependency enter paths that were previously local database reads, and outage planning has to account for a vendor you do not control.
- Analytics and joins on vaulted data are constrained; work that was a simple SQL join now happens through secure functions or on tokens, and data teams routinely discover this after the engineering team has committed.
- Unwinding the vault later is a rewrite rather than a migration because tokens are threaded through every service, so the switching cost climbs steadily and the negotiating position at renewal weakens with each release.
- Scope reduction is an architectural claim your own assessor must accept, so the audit saving is real only if the implementation genuinely keeps sensitive values off your systems, and partial implementations that leave a cache or a log line in place deliver the cost without the benefit.
Pricing, plan by plan
Asyncapi
Free- Open SourceFree
- AsyncAPI specification
- Tools
- Community support
Skyflow
On request- Skyflow Data Privacy Vault$undefined/year
- Platform fee plus usage by data subject count
- Priced additionally per data residency region
- PCI Level 1, SOC 2 Type 2, ISO 27001 and HIPAA coverage
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.
Choose Skyflow if
- You need tokenised storage.
- You work on API, Web, Self-hosted.
- You also want polymorphic encryption.
Questions people ask
- Is Asyncapi or Skyflow better?
- Neither clearly leads. Asyncapi starts at Free and Skyflow at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Asyncapi or Skyflow?
- Asyncapi has a free tier; the other does not. Paid plans start at Free for Asyncapi and On request for Skyflow.
- Does Asyncapi or Skyflow run on more platforms?
- Asyncapi runs on Web, CLI, IDE Extensions. Skyflow runs on API, Web, Self-hosted.
- Can I use Asyncapi for free?
- Yes. Asyncapi has a free tier, so you can try it without paying. Skyflow 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 Skyflow is typically brought in for.
- What can Asyncapi do that Skyflow cannot?
- Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Skyflow covers Tokenised storage, Polymorphic encryption, Field level access policies, Data residency.
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.
SourceSkyflow: Does Skyflow really take my systems out of PCI scope?
It can, if card data never touches your infrastructure and the detokenisation happens at the boundary. Your QSA has to agree the design, so validate the architecture with your assessor before signing.
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.
SourceSkyflow: What does it cost?
Nothing is published. Reported annual contracts sit around 195,000 US dollars, built from a platform fee plus usage by data subject count and additional charges per data residency region.
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.
SourceSkyflow: How does it help with data localisation?
Records can be pinned to a specified region, so an Indian or EU residency requirement is met by the vault rather than by you running regional databases and operations teams.
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.
SourceSkyflow: Can I still run analytics on vaulted data?
Partly. Aggregates and comparisons are supported through polymorphic encryption and secure functions, but arbitrary joins against other datasets are harder than they were, and this is the most common late surprise.
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