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Cloud · head to head

Skopeo vs Syft

Skopeo logo

Skopeo

Cloud

Inspect, copy and sign container images without pulling them

From
Free
Rated
-
Full reviewWebsite
Syft logo

Syft

Cybersecurity

Generates a software bill of materials from images, filesystems and archives

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; Syft lockfile parsing can drop packages silently. An open issue filed in August 2026 reports the yarn v1 cataloguer returning 118 of 745 packages with no error raised, which means a complete bill of materials and an 84 percent incomplete one look identical to the caller.
  • They diverge on capability: Skopeo covers Remote inspection, Syft covers Multi-format output.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Skopeo and Syft actually diverge.

Attributes where Skopeo and Syft differ
AttributeSkopeoSyft
PlatformsLinux, macOSmacOS, Linux, Windows, Docker
CategoryCloudCybersecurity

Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 Skopeo

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

Only in Syft

  • Multi-format output
  • Broad ecosystem coverage
  • Binary classifiers
  • In-toto attestations
  • Library and CLI
  • Pairs with Grype

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 Syft
  • Inspecting an image’s contents before deciding to deploy itnot Syft
  • Mirroring images into an air-gapped or internal registrynot Syft

Syft

  • Producing a bill of materials for a customer or regulator that requires onenot Skopeo
  • Feeding an inventory into a vulnerability scanner rather than scanning images directlynot Skopeo
  • Recording what shipped in a build so a future disclosure can be answered quicklynot Skopeo
  • Public sector work where an SBOM is a contractual deliverablenot 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

Syft

  • Lockfile parsing can drop packages silently. An open issue filed in August 2026 reports the yarn v1 cataloguer returning 118 of 745 packages with no error raised, which means a complete bill of materials and an 84 percent incomplete one look identical to the caller.
  • Fidelity varies sharply by ecosystem. Conan for C and C++, Haskell and Terraform get cataloguer support with no licence data, no dependency relationships and no file ownership, so a C and C++ shop gets the least from it.
  • Binary classification yields no licence or dependency metadata, and vendored or statically linked code is exactly where supply chain risk hides, so the blind spot and the risk overlap.
  • Incorrect CPE values and CPE collisions are recorded as open issues, and since Grype matches on CPE and PURL, an inventory error becomes a false negative in the security report downstream.
  • An inventory is not a risk assessment. Even a perfect bill of materials says a vulnerable version is present, never that the vulnerable function is called, and the triage burden lands entirely on the reader.

Pricing, plan by plan

Skopeo

Free
  • SkopeoFree
    • Full functionality
    • No usage limits
    • Community support

Syft

Free
  • SyftFree
    • Apache-2.0
    • No usage limits
    • Community support
  • Anchore Enterprise$undefined/year
    • Policy enforcement and reporting
    • Federal and commercial tiers
    • Pricing not published, quoted on request

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 Syft if

  • You need multi-format output.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, Docker.
  • You also want broad ecosystem coverage.
Syft review

Questions people ask

Is Skopeo or Syft better?
Neither clearly leads. Skopeo starts at Free and Syft at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Skopeo or Syft?
Skopeo starts at Free and Syft at Free.
Does Skopeo or Syft run on more platforms?
Skopeo runs on Linux, macOS. Syft runs on macOS, Linux, Windows, Docker.
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 Syft is typically brought in for.
What can Skopeo do that Syft cannot?
Skopeo covers Remote inspection, Registry-to-registry copy, Format conversion, Image signing. Syft covers Multi-format output, Broad ecosystem coverage, Binary classifiers, In-toto attestations.

Answered from the vendors’ own pages

Skopeo: Is Skopeo free?

Yes, open source with no licence fee.

Syft: Does Syft find vulnerabilities?

No. It produces an inventory. Grype, from the same company, matches that inventory against vulnerability feeds. They are separate tools and the distinction is frequently lost.

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.

Syft: Does anything in the Anchore stack do reachability analysis?

No. Neither Syft, Grype nor the commercial Anchore platform performs call graph or reachability analysis, so none of them tells you whether a vulnerable code path is actually invoked.

Skopeo: Can Skopeo run containers?

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

Syft: Is it a CNCF or OpenSSF project?

No. It is single-vendor open source owned by Anchore, with no foundation governance. That is a different licence risk profile from Sigstore.

Syft: What does Anchore Enterprise cost?

Not published. The pricing page is contact-sales only, with named but unpriced commercial and federal tiers.

Syft: How do I know my SBOM is complete?

You largely cannot, which is the honest answer. Silent partial parsing is a known open defect, so a bill of materials used for compliance should be spot-checked against a known dependency list.

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