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Cybersecurity · head to head

Cosign vs Snyk

Cosign logo

Cosign

Cybersecurity

Signs and verifies container images and artifacts, with or without managing keys

From
Free
Rated
-
Full reviewWebsite
Snyk logo

Snyk

Cybersecurity

Developer-first security platform

From
Free
Rated
-
Full reviewWebsite

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.; Snyk free plan has strict test limits across all modules: Open Source (200), Code (100), Infrastructure as Code (300), Container (100) tests per month
  • They diverge on capability: Cosign covers Keyless signing, Snyk covers Open source security.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and Snyk actually diverge.

Attributes where Cosign and Snyk differ
AttributeCosignSnyk
Pricing modelOpen source, no licence feefreemium
PlatformsmacOS, Linux, Windows, DockerWeb, CLI, IDE integrations
FoundedUnknown2015

Identical on both: starting price (Free), 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 Snyk

  • Open source security
  • Code security (SAST)
  • Container security
  • IaC security
  • License compliance
  • Fix PRs
  • Priority scoring
  • Developer IDE integration

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 Snyk
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Snyk
  • Meeting a customer or regulatory requirement for signed artifactsnot Snyk
  • Verifying third-party images before they enter an internal registrynot Snyk

Snyk

  • Vulnerability scanningnot Cosign
  • Application securitynot Cosign
  • Infrastructure as Code securitynot Cosign
  • Container securitynot 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.

Snyk

  • Free plan has strict test limits across all modules: Open Source (200), Code (100), Infrastructure as Code (300), Container (100) tests per month
  • Free and Team plans count only contributing developers making commits within 90 days; public contributions do not count
  • Enterprise plan requires custom pricing and sales contact

Pricing, plan by plan

Cosign

Free
  • CosignFree
    • Apache-2.0
    • Public Sigstore infrastructure free to use
    • No usage limits published

Snyk

Free
  • FreeFree
    • SCA scanning
    • SAST scanning
    • IaC and Container scanning
  • Team$25/month
    • 1000 Code tests
    • 100 projects
    • Jira integration
  • Ignite$105/month
    • Unlimited tests
    • Unlimited projects
    • Custom security rules
  • Enterprise$null/custom
    • Zero-day prevention
    • Unified AppSec control
    • Full SDLC automation

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.
Cosign review

Choose Snyk if

  • You need open source security.
  • You want to start without paying.
  • You work on Web, CLI, IDE integrations.
  • You also want code security (sast).
Snyk review

Questions people ask

Is Cosign or Snyk better?
Neither clearly leads. Cosign starts at Free and Snyk at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or Snyk?
Cosign starts at Free and Snyk at Free.
Does Cosign or Snyk run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. Snyk runs on Web, CLI, IDE integrations.
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 Snyk is typically brought in for.
What can Cosign do that Snyk cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Snyk covers Open source security, Code security (SAST), Container security, IaC security.

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.

Snyk: How much does Snyk cost?

Snyk offers a free plan with limited tests, Team plan at $25/month per contributing developer, Ignite at $1260/year, and custom Enterprise pricing. Contributing developers are those who made commits to private repos within the last 90 days.

Source
Cosign: Is signing alone enough?

No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.

Snyk: What does Snyk's Team plan include?

The Team plan at $25/month includes 1000 Code tests, up to 100 projects, Jira integration, next business day support, and all features from the free plan including SCA, SAST, IaC and Container scanning.

Source
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.

Snyk: Is there a free version of Snyk?

Yes, Snyk offers a free plan with full platform access including SCA, SAST, IaC and Container scanning. The free tier includes 200 Open Source tests, 100 Code tests, 300 IaC tests, 100 Container tests, and up to 5 projects.

Source
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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