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Cybersecurity · head to head

Cosign vs SonarQube

Cosign logo

Cosign

Cybersecurity

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

From
Free
Free plan
Yes
Full reviewWebsite
SonarQube logo

SonarQube

Developer Tools

Code quality and code security for clean code, at every step

From
Free
Free plan
Yes
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.; SonarQube advanced Security add-on uses custom pricing
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and SonarQube actually diverge.

Attributes where Cosign and SonarQube differ
AttributeCosignSonarQube
Pricing modelOpen source, no licence feesubscription
PlatformsmacOS, Linux, Windows, DockerWeb
CategoryCybersecurityDeveloper Tools

Identical on both: starting price (Free), 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 Cosign

  • Keyless signing
  • Key and KMS signing
  • Registry-native storage
  • In-toto attestations
  • Offline verification
  • Trusted root and signing config

Only in SonarQube

Nothing recorded that Cosign does not also cover.

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

SonarQube

  • Code quality analysisnot Cosign
  • Vulnerability detectionnot Cosign
  • Security scanningnot Cosign
  • Compliance reportingnot 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.

SonarQube

  • Advanced Security add-on uses custom pricing
  • Only private project lines of code count toward limits

Pricing, plan by plan

Cosign

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

SonarQube

Free
  • FreeFree
    • Supports up to 50000 lines of code in private projects
    • Never expires
    • Covers public projects
  • Team$34/month
    • 30+ languages
    • Code quality standards
    • Bug and vulnerability detection
  • Enterprise$null/custom
    • Advanced security reports
    • OWASP/CWE/PCI DSS compliance
    • Unlimited users and projects

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 SonarQube if

  • You want to start without paying.
SonarQube review

Questions people ask

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

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.

SonarQube: How much does SonarQube cost?

SonarQube offers a free tier supporting up to 50000 lines of code in private projects, a Team plan starting at $34/month, and custom Enterprise pricing. Team plan includes 14-day free trial.

Source
Cosign: Is signing alone enough?

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

SonarQube: Is SonarQube free?

Yes, SonarQube offers a free tier that never expires and covers both public and private projects up to 50000 lines of code in private projects.

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.

SonarQube: What languages does SonarQube support?

SonarQube Team plan supports 30+ languages including common programming languages. Enterprise plan adds support for 40+ languages including ABAP, COBOL, and Apex.

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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