Softwr

Cybersecurity · head to head

Cosign vs GitLab CI/CD

Cosign logo

Cosign

Cybersecurity

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

From
Free
Free plan
Yes
Full reviewWebsite
GitLab CI/CD logo

GitLab CI/CD

Developer Tools

Automatically build, test, deploy, and monitor your applications with GitLab CI/CD

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.; GitLab CI/CD compute minute quotas for Premium and Ultimate tiers not disclosed in documentation
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and GitLab CI/CD actually diverge.

Attributes where Cosign and GitLab CI/CD differ
AttributeCosignGitLab CI/CD
Pricing modelOpen source, no licence feefreemium
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 GitLab CI/CD

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

GitLab CI/CD

  • Reducing open source project infrastructure costs with public project discountsnot Cosign
  • Enforcing monthly CI/CD spending limits and quota notificationsnot Cosign
  • Allocating compute minutes to open source contributors affordablynot Cosign
  • Forecasting CI/CD spending patterns across multiple projectsnot Cosign
  • Providing private runners for cost control without owning infrastructurenot 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.

GitLab CI/CD

  • Compute minute quotas for Premium and Ultimate tiers not disclosed in documentation
  • Additional compute minutes beyond quota incur charges; exact pricing not specified

Pricing, plan by plan

Cosign

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

GitLab CI/CD

Free
  • FreeFree
    • 400 compute minutes per month for free tier namespaces
    • Linux x86-64 runners at 1x cost factor
  • Premium$null/tiered
    • Higher monthly compute minute quotas than free tier
    • Additional compute minutes available for purchase
  • Ultimate$null/tiered
    • Highest monthly compute minute allocations
    • Additional compute minutes available for purchase

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 GitLab CI/CD if

  • You want to start without paying.
GitLab CI/CD review

Questions people ask

Is Cosign or GitLab CI/CD better?
Neither clearly leads. Cosign starts at Free and GitLab CI/CD at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or GitLab CI/CD?
Cosign starts at Free and GitLab CI/CD at Free.
Does Cosign or GitLab CI/CD run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. GitLab CI/CD 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 GitLab CI/CD is typically brought in for.
What can Cosign do that GitLab CI/CD 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.

GitLab CI/CD: How many GitLab CI compute minutes does the free tier include?

The free tier of GitLab CI includes 400 compute minutes per month for free tier namespaces on GitLab.com.

Source
Cosign: Is signing alone enough?

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

GitLab CI/CD: What is the cost factor for different GitLab CI runner types?

Linux x86-64 small runners cost 1x; medium runners cost 2x; large runners cost 3x. macOS and Windows runners have cost factors of 6-12x and are in beta status.

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.

GitLab CI/CD: Do public open-source projects get discounts on GitLab CI compute minutes?

Public open-source projects receive a 0.5x discount on compute minutes. Public forks of GitLab open-source projects receive a 0.008x discount.

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.

Share

Related pages

More on Cosign

More on GitLab CI/CD

Keep looking

Other head to heads