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APIs · head to head

Kong Gateway vs Swagger/OpenAPI

Kong Gateway logo

Kong Gateway

APIs

Open-source and cloud API gateway for managing microservices traffic

From
Free
Rated
-
Full reviewWebsite
Swagger/OpenAPI logo

Swagger/OpenAPI

APIs

API specification and documentation framework using OpenAPI standard

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kong Gateway the free open-source gateway lacks the analytics, portals, and support of the paid Konnect tiers.; Swagger/OpenAPI the OpenAPI Specification itself is licensed under Apache License 2.0 and free to use; SwaggerHub is a separate paid tool built on top of it
  • They diverge on capability: Kong Gateway covers API request routing, Swagger/OpenAPI covers OpenAPI Specification.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Kong Gateway and Swagger/OpenAPI actually diverge.

Attributes where Kong Gateway and Swagger/OpenAPI differ
AttributeKong GatewaySwagger/OpenAPI
Platformsweb, linux, apiWeb, CLI, Desktop
Founded20172001

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), 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 Kong Gateway

  • API request routing
  • Plugin ecosystem
  • Developer portals
  • AI Gateway
  • Analytics and observability
  • SSO and audit logs

Only in Swagger/OpenAPI

  • OpenAPI Specification
  • Interactive Documentation
  • Code Generation
  • GitHub
  • GitLab
  • Jenkins
  • IDE plugins
  • Web support

What people use each for

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

Kong Gateway

  • Routing and securing traffic across microservicesnot Swagger/OpenAPI
  • Publishing internal or external developer portalsnot Swagger/OpenAPI
  • Managing rate limits and authentication at the API edgenot Swagger/OpenAPI
  • Gateway-level routing to multiple LLM providersnot Swagger/OpenAPI

Swagger/OpenAPI

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

Where each one falls short

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

Kong Gateway

  • The free open-source gateway lacks the analytics, portals, and support of the paid Konnect tiers.
  • Plus tier caps API requests at 1M/month before incurring per-million overage charges.
  • Enterprise pricing is custom and not published, making budgeting harder without sales contact.
  • Configuration and plugin management can require significant operational expertise to run at scale.

Swagger/OpenAPI

  • The OpenAPI Specification itself is licensed under Apache License 2.0 and free to use; SwaggerHub is a separate paid tool built on top of it

Pricing, plan by plan

Kong Gateway

Free
  • Free TrialFree
    • 30-day enterprise functionality trial
    • Unlimited gateways
    • 30-day analytics retention
  • Plus$undefined/month
    • Up to 5 serverless, 2 hybrid, 2 dedicated cloud gateways
    • 1M API requests/month included
    • Up to 2 developer portals
  • Enterprise$undefined/month
    • Unlimited hybrid and dedicated cloud gateways
    • Unlimited developer portals
    • SSO and audit logs

Swagger/OpenAPI

Free
  • Open SourceFree
    • OpenAPI specification
    • Community tools
  • SwaggerHub FreeFree
    • Cloud editor
    • API mocking
    • API testing
  • SwaggerHub Pro$75/monthly
    • Team collaboration
    • Advanced mocking
    • Analytics

Which should you pick?

Choose Kong Gateway if

  • You need api request routing.
  • You want to start without paying.
  • You work on web, linux, api.
  • You also want plugin ecosystem.
Kong Gateway review

Choose Swagger/OpenAPI if

  • You need openapi specification.
  • You want to start without paying.
  • You work on Web, CLI, Desktop.
  • You also want interactive documentation.
Swagger/OpenAPI review

Questions people ask

Is Kong Gateway or Swagger/OpenAPI better?
Neither clearly leads. Kong Gateway starts at Free and Swagger/OpenAPI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kong Gateway or Swagger/OpenAPI?
Kong Gateway starts at Free and Swagger/OpenAPI at Free.
Does Kong Gateway or Swagger/OpenAPI run on more platforms?
Kong Gateway runs on web, linux, api. Swagger/OpenAPI runs on Web, CLI, Desktop.
Can I use Kong Gateway for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kong Gateway best used for?
Kong Gateway is most often used for routing and securing traffic across microservices, publishing internal or external developer portals, managing rate limits and authentication at the api edge, gateway-level routing to multiple llm providers. Of those, routing and securing traffic across microservices and publishing internal or external developer portals are not what Swagger/OpenAPI is typically brought in for.
What can Kong Gateway do that Swagger/OpenAPI cannot?
Kong Gateway covers API request routing, Plugin ecosystem, Developer portals, AI Gateway. Swagger/OpenAPI covers OpenAPI Specification, Interactive Documentation, Code Generation, GitHub.

Answered from the vendors’ own pages

Kong Gateway: Is Kong Gateway free?

Kong's core gateway is open source and free to self-host. Kong Konnect, the managed cloud platform, offers a 30-day free trial before moving to paid Plus or custom Enterprise pricing.

Source
Swagger/OpenAPI: Is Swagger UI free to use?

Swagger UI is an open source tool with source code publicly available on GitHub at no cost. It is one of thousands of free open source projects in the Swagger ecosystem.

Source
Kong Gateway: How is usage metered on the Plus plan?

The Plus plan includes 1M API requests per month, with additional usage billed at $200 per extra 1 million requests up to a 10M/month cap, plus per-gateway and per-LLM-model charges.

Source
Swagger/OpenAPI: What commercial Swagger products are available beyond the open source tools?

Swagger offers Swagger for Teams for streamlined API workflow with interactive editors and hosted documentation, and Swagger Enterprise for organizations needing secure on-premise or cloud-based environments. Specific pricing requires contacting sales.

Source
Kong Gateway: What support is included?

Plus includes email support with a 2-business-day SLA, while Enterprise adds dedicated success managers and professional services.

Source
Swagger/OpenAPI: Are there commercial versions that build on the open source Swagger tools?

Yes, commercial Swagger products integrate the core functionality of Swagger open source tools (Editor, UI, and Codegen) with advanced capabilities for team collaboration, standards enforcement, and enterprise features.

Source
Swagger/OpenAPI: Is there a trial available for Swagger commercial products?

A Start Trial call-to-action is available on the Swagger website, but specific trial duration and terms are not disclosed on the product pages.

Source
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