Softwr

Cloud · head to head

Skopeo vs Terragrunt

Skopeo logo

Skopeo

Cloud

Inspect, copy and sign container images without pulling them

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: Skopeo single-purpose: it neither builds nor runs images, so it is one tool in a chain rather than a solution; Terragrunt additional complexity layer on top of Terraform
  • They diverge on capability: Skopeo covers Remote inspection, Terragrunt covers Infrastructure orchestration.

Where they differ

Only the attributes on which Skopeo and Terragrunt actually diverge.

Attributes where Skopeo and Terragrunt differ
AttributeSkopeoTerragrunt
Pricing modelOpen source, no licence feeUnknown
PlatformsLinux, macOSAWS, Azure, GCP

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Cloud).

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 Skopeo

  • Remote inspection
  • Registry-to-registry copy
  • Format conversion
  • Image signing

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.

Skopeo

  • Promoting images between staging and production registries without a round tripnot Terragrunt
  • Inspecting an image’s contents before deciding to deploy itnot Terragrunt
  • Mirroring images into an air-gapped or internal registrynot Terragrunt

Terragrunt

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

Where each one falls short

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

Skopeo

  • Single-purpose: it neither builds nor runs images, so it is one tool in a chain rather than a solution
  • Command syntax with transport prefixes such as docker:// is unusual and trips people up initially
  • Documentation is sparse compared with the rest of the container ecosystem

Terragrunt

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

Pricing, plan by plan

Skopeo

Free
  • SkopeoFree
    • Full functionality
    • No usage limits
    • 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 Skopeo if

  • You need remote inspection.
  • You want to start without paying.
  • You work on Linux, macOS.
  • You also want registry-to-registry copy.
Skopeo 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 Skopeo or Terragrunt better?
Neither clearly leads. Skopeo 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, Skopeo or Terragrunt?
Skopeo starts at Free and Terragrunt at Free.
Does Skopeo or Terragrunt run on more platforms?
Skopeo runs on Linux, macOS. Terragrunt runs on AWS, Azure, GCP.
Can I use Skopeo for free?
Both have a free tier, so you can try either at no cost before committing.
What is Skopeo best used for?
Skopeo is most often used for promoting images between staging and production registries without a round trip, inspecting an image’s contents before deciding to deploy it, mirroring images into an air-gapped or internal registry. Of those, promoting images between staging and production registries without a round trip and inspecting an image’s contents before deciding to deploy it are not what Terragrunt is typically brought in for.
What can Skopeo do that Terragrunt cannot?
Skopeo covers Remote inspection, Registry-to-registry copy, Format conversion, Image signing. Terragrunt covers Infrastructure orchestration, Run Queue, DRY configuration, Automated hooks.

Answered from the vendors’ own pages

Skopeo: Is Skopeo free?

Yes, open source with no licence fee.

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
Skopeo: Why copy images without pulling them?

A registry-to-registry copy avoids downloading and re-uploading gigabytes, which is faster and much cheaper on bandwidth in CI.

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
Skopeo: Can Skopeo run containers?

No. It only inspects, copies, signs and deletes images. Running them is Podman’s or Docker’s job.

Share

Related pages

More on Skopeo

More on Terragrunt

Keep looking

Other head to heads