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Cybersecurity · head to head

Grype vs Nixpacks

Grype logo

Grype

Cybersecurity

Vulnerability scanner for container images and filesystems

From
Free
Free plan
Yes
Full reviewWebsite
Nixpacks logo

Nixpacks

Developer Tools

Build system that turns a source directory into an OCI image, now in maintenance mode

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Grype depends on public vulnerability databases, so coverage and false positives vary by ecosystem; Nixpacks the project is in maintenance mode with no commits on the default branch since May 2026 and no release since October 2025, so support for new language versions arrives only if someone forks it.
  • They diverge on capability: Grype covers Image and filesystem scanning, Nixpacks covers Automatic language detection.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Grype and Nixpacks actually diverge.

Attributes where Grype and Nixpacks differ
AttributeGrypeNixpacks
PlatformsLinux, macOS, Windows, DockerLinux, macOS, CLI, Docker
CategoryCybersecurityDeveloper Tools

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 Nixpacks

  • Automatic language detection
  • No Dockerfile required
  • Nix toolchains
  • Configuration escape hatches
  • Docker layer caching

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 Nixpacks
  • Failing CI when a build introduces a known vulnerabilitynot Nixpacks
  • Auditing what is actually installed inside a third-party imagenot Nixpacks

Nixpacks

  • Understanding the build behaviour of a platform that adopted Nixpacks before it was frozennot Grype
  • Producing container images from a polyglot monorepo where nobody wants to own several Dockerfilesnot Grype
  • Reproducing an existing Railway build locally while planning a migration to Railpacknot Grype
  • Comparing what a Nix based builder does differently from a buildpack before choosing a successornot 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

Nixpacks

  • The project is in maintenance mode with no commits on the default branch since May 2026 and no release since October 2025, so support for new language versions arrives only if someone forks it.
  • Build determinism is softer than it appears, because providers pin a nixpkgs archive commit and bumping that archive silently moves compiler and runtime versions underneath a build that looks unchanged.
  • Caching is limited to Docker layers rather than a content addressed graph, so a small change early in the build invalidates everything after it, which is exactly the limitation Railpack was rewritten to fix.
  • Images carry Nix store layers and come out larger than an equivalent tuned Dockerfile or buildpack output, which costs registry storage and slows cold pulls on scale-out.
  • There is no specification, no vendor neutral governance and no third party provider ecosystem, so a single company was able to redirect strategy and leave every downstream user with a frozen build tool.

Pricing, plan by plan

Grype

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

Nixpacks

Free
  • NixpacksFree
    • MIT licensed, no usage limits
    • No commercial edition and no support contract
    • In maintenance mode, superseded by Railpack

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 Nixpacks if

  • You need automatic language detection.
  • You want to start without paying.
  • You work on Linux, macOS, CLI, Docker.
  • You also want no dockerfile required.
Nixpacks review

Questions people ask

Is Grype or Nixpacks better?
Neither clearly leads. Grype starts at Free and Nixpacks at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Grype or Nixpacks?
Grype starts at Free and Nixpacks at Free.
Does Grype or Nixpacks run on more platforms?
Grype runs on Linux, macOS, Windows, Docker. Nixpacks runs on Linux, macOS, CLI, Docker.
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 Nixpacks is typically brought in for.
What can Grype do that Nixpacks cannot?
Grype covers Image and filesystem scanning, SBOM-driven, Wide ecosystem coverage, Pipeline friendly. Nixpacks covers Automatic language detection, No Dockerfile required, Nix toolchains, Configuration escape hatches.

Answered from the vendors’ own pages

Grype: Is Grype free?

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

Nixpacks: Should I start a new project on Nixpacks?

No. The documentation and README both say it is in maintenance mode and recommend Railpack. Choose Railpack, Cloud Native Buildpacks or a Dockerfile instead.

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.

Nixpacks: Will my existing Nixpacks builds stop working?

Not immediately. Pinned nixpkgs archives keep resolving, so builds continue. What you lose is support for new runtime major versions and any fix for a provider bug.

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.

Nixpacks: What replaces it?

Railpack, also from Railway and also MIT licensed, rebuilt as a BuildKit custom frontend for finer grained caching and parallel steps.

Nixpacks: Is it still open source?

Yes, MIT, and the repository is not archived. Being open source does not help much when nobody is merging provider updates.

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