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Developer Tools · head to head

Swagger UI vs Terragrunt

Swagger UI logo

Swagger UI

Developer Tools

Interactive API documentation generated from OpenAPI specs

From
Free
Rated
-
Full reviewWebsite
Terragrunt logo

Terragrunt

Cloud

The Open Source IaC Orchestrator Platform Teams Trust

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Swagger UI only as good as the specification: a thin OpenAPI file produces thin documentation; Terragrunt additional complexity layer on top of Terraform
  • They diverge on capability: Swagger UI covers OpenAPI rendering, Terragrunt covers Infrastructure orchestration.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Swagger UI and Terragrunt actually diverge.

Attributes where Swagger UI and Terragrunt differ
AttributeSwagger UITerragrunt
Pricing modelOpen source, no licence feeUnknown
PlatformsWeb, Self-hosted, DockerAWS, Azure, GCP
CategoryDeveloper ToolsCloud

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 Swagger UI

  • OpenAPI rendering
  • Try it out
  • Schema display
  • Self-hostable

Only in Terragrunt

  • Infrastructure orchestration
  • Run Queue
  • DRY configuration
  • Automated hooks
  • Infrastructure catalog
  • Least-privilege access

What people use each for

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

Swagger UI

  • Publishing API documentation that stays in step with the specificationnot Terragrunt
  • Letting developers try endpoints before writing any client codenot Terragrunt
  • Internal API discovery across teamsnot Terragrunt

Terragrunt

  • Organizing Terraform code across multiple environmentsnot Swagger UI
  • Automating infrastructure deployment workflowsnot Swagger UI
  • Implementing infrastructure as code templates for developer self-servicenot Swagger UI

Where each one falls short

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

Swagger UI

  • Only as good as the specification: a thin OpenAPI file produces thin documentation
  • Default presentation is dated compared with modern documentation tools
  • Large specifications render slowly and become hard to navigate
  • Try it out against production needs care with authentication and CORS, and is often disabled as a result

Terragrunt

  • Additional complexity layer on top of Terraform
  • Requires understanding of Terraform concepts
  • Paid tier pricing not clearly published

Pricing, plan by plan

Swagger UI

Free
  • Swagger UIFree
    • Full functionality
    • Commercial use permitted
    • Community support

Terragrunt

Free
  • Open SourceFree
    • Terragrunt CLI - completely free
    • Community support
  • Terragrunt Scale FreeFree
    • Free CI/CD pipeline
    • Unlimited runs and resources
    • For up to 25 infrastructure units
  • Terragrunt Scale Paid$undefined/custom
    • Volume pricing for more than 25 infrastructure units
    • Enterprise support

Which should you pick?

Choose Swagger UI if

  • You need openapi rendering.
  • You want to start without paying.
  • You work on Web, Self-hosted, Docker.
  • You also want try it out.
Swagger UI review

Choose Terragrunt if

  • You need infrastructure orchestration.
  • You want to start without paying.
  • You work on AWS, Azure, GCP.
  • You also want run queue.
Terragrunt review

Questions people ask

Is Swagger UI or Terragrunt better?
Neither clearly leads. Swagger UI starts at Free and Terragrunt at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Swagger UI or Terragrunt?
Swagger UI starts at Free and Terragrunt at Free.
Does Swagger UI or Terragrunt run on more platforms?
Swagger UI runs on Web, Self-hosted, Docker. Terragrunt runs on AWS, Azure, GCP.
Can I use Swagger UI for free?
Both have a free tier, so you can try either at no cost before committing.
What is Swagger UI best used for?
Swagger UI is most often used for publishing api documentation that stays in step with the specification, letting developers try endpoints before writing any client code, internal api discovery across teams. Of those, publishing api documentation that stays in step with the specification and letting developers try endpoints before writing any client code are not what Terragrunt is typically brought in for.
What can Swagger UI do that Terragrunt cannot?
Swagger UI covers OpenAPI rendering, Try it out, Schema display, Self-hostable. Terragrunt covers Infrastructure orchestration, Run Queue, DRY configuration, Automated hooks.

Answered from the vendors’ own pages

Swagger UI: Is Swagger UI free?

Yes, open source under the Apache 2.0 licence. SmartBear sells commercial SwaggerHub separately.

Terragrunt: Is Terragrunt free?

Yes, the Terragrunt CLI is completely free and open source. Terragrunt Scale offers a free tier for up to 25 infrastructure units.

Source
Swagger UI: What is the difference between Swagger and OpenAPI?

OpenAPI is the specification format; Swagger is the toolset around it, including Swagger UI. The specification was renamed from Swagger to OpenAPI in 2016.

Terragrunt: What is the difference between Terragrunt and Terraform?

Terragrunt is an orchestration layer on top of Terraform that handles state management, DRY principles, and deployment automation without replacing Terraform itself.

Source
Swagger UI: Can Swagger UI make real API calls?

Yes, through its try-it-out control, though authentication and CORS configuration often mean it is disabled for production APIs.

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