Cybersecurity · head to head
Cosign vs Grype
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Grype
Cybersecurity
Vulnerability scanner for container images and filesystems
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Cosign keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.; Grype depends on public vulnerability databases, so coverage and false positives vary by ecosystem
- They diverge on capability: Cosign covers Keyless signing, Grype covers Image and filesystem scanning.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Grype actually diverge.
Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated), category (Cybersecurity).
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 Cosign
- Keyless signing
- Key and KMS signing
- Registry-native storage
- In-toto attestations
- Offline verification
- Trusted root and signing config
Only in Grype
- Image and filesystem scanning
- SBOM-driven
- Wide ecosystem coverage
- Pipeline friendly
What people use each for
The jobs each tool is most often brought in to do.
Cosign
- Signing container images in a build pipeline without managing long-lived private keysnot Grype
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Grype
- Meeting a customer or regulatory requirement for signed artifactsnot Grype
- Verifying third-party images before they enter an internal registrynot Grype
Grype
- Re-scanning stored SBOMs as new CVEs are published, without rebuilding imagesnot Cosign
- Failing CI when a build introduces a known vulnerabilitynot Cosign
- Auditing what is actually installed inside a third-party imagenot Cosign
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Cosign
- Keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
- A signature proves who signed, never whether they should have. The documentation is explicit that Sigstore cannot determine authorisation, so every consumer must write and maintain their own identity and issuer policy or verification means nothing.
- Nothing is enforced without an admission controller. Signing changes what you can prove, not what runs, and the official policy controller has a small maintainer base for a component sitting in a cluster admission path.
- Upgrades break pipelines. Version 3 changed defaults, version 4 is announced as removing legacy functionality and roughly half the command line flags, and two official client libraries still lacked support for the new log format as of mid 2026.
- Signatures do not expire. An artifact signed before a maintainer account was compromised and one signed after are indistinguishable unless somebody is actively monitoring the transparency log, and almost nobody is.
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
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Grype
Free- GrypeFree
- Full functionality
- No usage limits
- Community support
Which should you pick?
Choose Cosign if
- You need keyless signing.
- You want to start without paying.
- You work on macOS, Linux, Windows, Docker.
- You also want key and kms signing.
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.
Questions people ask
- Is Cosign or Grype better?
- Neither clearly leads. Cosign starts at Free and Grype at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Grype?
- Cosign starts at Free and Grype at Free.
- Does Cosign or Grype run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Grype runs on Linux, macOS, Windows, Docker.
- Can I use Cosign for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Cosign best used for?
- Cosign is most often used for signing container images in a build pipeline without managing long-lived private keys, attaching a signed bill of materials to a release so consumers can verify its provenance, meeting a customer or regulatory requirement for signed artifacts, verifying third-party images before they enter an internal registry. Of those, signing container images in a build pipeline without managing long-lived private keys and attaching a signed bill of materials to a release so consumers can verify its provenance are not what Grype is typically brought in for.
- What can Cosign do that Grype cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Grype covers Image and filesystem scanning, SBOM-driven, Wide ecosystem coverage, Pipeline friendly.
Answered from the vendors’ own pages
Cosign: Does Cosign tell me if an image is vulnerable?
No. It has no vulnerability knowledge whatsoever. It can carry an SBOM as a signed attestation but never reads it. Pair it with a scanner.
Grype: Is Grype free?
Yes, open source from Anchore. Anchore Enterprise is the paid platform around it.
Cosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
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.
Cosign: What does a bare cosign verify actually prove?
Very little. Without a pinned certificate identity and OIDC issuer, it accepts a valid signature from any identity at all.
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.
Cosign: What is the risk of keyless signing?
Your OIDC provider becomes the root of trust. Compromise of that account yields genuine, verifiable signatures, so account security is the control that matters.
Cosign: Should we expect breaking changes?
Yes. Version 4 is announced to remove roughly half the flags, and a post-quantum migration is named as a further breaking change after that.
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