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Cybersecurity · head to head

Grype vs Kustomize

Grype logo

Grype

Cybersecurity

Vulnerability scanner for container images and filesystems

From
Free
Rated
-
Full reviewWebsite
Kustomize logo

Kustomize

Cloud

Template-free customisation of Kubernetes YAML

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Grype depends on public vulnerability databases, so coverage and false positives vary by ecosystem; Kustomize no packaging or distribution story, which is exactly what Helm charts provide
  • They diverge on capability: Grype covers Image and filesystem scanning, Kustomize covers Overlay patching.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Grype and Kustomize actually diverge.

Attributes where Grype and Kustomize differ
AttributeGrypeKustomize
PlatformsLinux, macOS, Windows, DockerKubernetes, Linux, macOS, Windows
CategoryCybersecurityCloud

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 Grype

  • Image and filesystem scanning
  • SBOM-driven
  • Wide ecosystem coverage
  • Pipeline friendly

Only in Kustomize

  • Overlay patching
  • No templating language
  • Built into kubectl
  • Generators

What people use each for

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

Grype

  • Re-scanning stored SBOMs as new CVEs are published, without rebuilding imagesnot Kustomize
  • Failing CI when a build introduces a known vulnerabilitynot Kustomize
  • Auditing what is actually installed inside a third-party imagenot Kustomize

Kustomize

  • Managing dev, staging and production variants of the same manifestsnot Grype
  • Keeping manifests readable and directly applyable rather than templatednot Grype
  • Patching third-party manifests without forking themnot Grype

Where each one falls short

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

Grype

  • Depends on public vulnerability databases, so coverage and false positives vary by ecosystem
  • No triage, exception tracking or reporting UI — that is Anchore’s commercial product
  • Overlaps heavily with Trivy, and most teams pick one rather than running both

Kustomize

  • No packaging or distribution story, which is exactly what Helm charts provide
  • Deeply nested overlays become hard to follow, and reasoning about the final output requires building it
  • No release lifecycle: nothing tracks what is installed or supports rollback the way Helm does
  • Patch syntax is fiddly for anything beyond simple field replacement

Pricing, plan by plan

Grype

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

Kustomize

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

Which should you pick?

Choose Grype if

  • You need image and filesystem scanning.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker.
  • You also want sbom-driven.
Grype review

Choose Kustomize if

  • You need overlay patching.
  • You want to start without paying.
  • You work on Kubernetes, Linux, macOS, Windows.
  • You also want no templating language.
Kustomize review

Questions people ask

Is Grype or Kustomize better?
Neither clearly leads. Grype starts at Free and Kustomize at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grype or Kustomize?
Grype starts at Free and Kustomize at Free.
Does Grype or Kustomize run on more platforms?
Grype runs on Linux, macOS, Windows, Docker. Kustomize runs on Kubernetes, Linux, macOS, Windows.
Can I use Grype for free?
Both have a free tier, so you can try either at no cost before committing.
What is Grype best used for?
Grype is most often used for re-scanning stored sboms as new cves are published, without rebuilding images, failing ci when a build introduces a known vulnerability, auditing what is actually installed inside a third-party image. Of those, re-scanning stored sboms as new cves are published, without rebuilding images and failing ci when a build introduces a known vulnerability are not what Kustomize is typically brought in for.
What can Grype do that Kustomize cannot?
Grype covers Image and filesystem scanning, SBOM-driven, Wide ecosystem coverage, Pipeline friendly. Kustomize covers Overlay patching, No templating language, Built into kubectl, Generators.

Answered from the vendors’ own pages

Grype: Is Grype free?

Yes, open source from Anchore. Anchore Enterprise is the paid platform around it.

Kustomize: Is Kustomize free?

Yes, open source and part of the Kubernetes project.

Grype: What is the difference between Grype and Syft?

Syft generates the software bill of materials; Grype matches that inventory against vulnerability data. They are designed to be used together.

Kustomize: Kustomize or Helm?

Kustomize patches plain YAML and keeps bases readable; Helm templates and packages applications with a release lifecycle. Many teams use both — Helm to install third-party charts, Kustomize to patch them.

Grype: Grype or Trivy?

They cover similar ground. Trivy is broader out of the box, including misconfiguration and secret scanning; Grype pairs more cleanly with an SBOM-first workflow.

Kustomize: Do I need to install Kustomize?

No. It is built into kubectl, available through kubectl apply -k.

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