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Cybersecurity · head to head

Cosign vs MetricStream

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
MetricStream logo

MetricStream

Cybersecurity

Enterprise GRC suite for large regulated organisations, with implementation costs that exceed the licence

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • 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.; MetricStream implementation typically costs one and a half to two and a half times the first year licence, so a one million dollar licence carries a one and a half to two and a half million dollar rollout that rarely appears in the initial business case.
  • They diverge on capability: Cosign covers Keyless signing, MetricStream covers Enterprise and operational risk.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and MetricStream actually diverge.

Attributes where Cosign and MetricStream differ
AttributeCosignMetricStream
Starting priceFreeOn request
Pricing modelOpen source, no licence feequote
Free tierYesNo
PlatformsmacOS, Linux, Windows, DockerWeb

Identical on both: 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 MetricStream

  • Enterprise and operational risk
  • Regulatory compliance
  • Internal audit
  • Third-party risk
  • Cyber risk quantification
  • Policy and case management
  • Content libraries
  • ESG reporting

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

MetricStream

  • A multinational bank mapping one control set against obligations from several regulators and needing to evidence the mapping to examinersnot Cosign
  • An insurer consolidating separate risk, audit and vendor systems that currently produce contradictory numbers to the boardnot Cosign
  • A pharmaceutical company that must track regulatory change across jurisdictions and show what each change affectednot Cosign
  • An organisation whose three lines of defence must share one risk taxonomy rather than three overlapping spreadsheetsnot 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.

MetricStream

  • Implementation typically costs one and a half to two and a half times the first year licence, so a one million dollar licence carries a one and a half to two and a half million dollar rollout that rarely appears in the initial business case.
  • Full deployment takes six to eighteen months, during which the organisation runs old and new processes in parallel and the promised efficiency gain is negative.
  • Per-user pricing in the low thousands per year per seat discourages giving access to the first line of defence, which is precisely where risk data originates, so many deployments end up with data still arriving by spreadsheet.
  • Configuration flexibility comes at the price of specialist skills, and organisations become dependent on MetricStream partners or a small internal team, making later changes slow and expensive.
  • The interface and workflow feel enterprise-heavy next to modern compliance tools, and infrequent business users find it hard, which suppresses the participation the platform is meant to enable.

Pricing, plan by plan

Cosign

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

MetricStream

On request
  • MetricStream GRC$undefined/year
    • Enterprise risk, audit, compliance and third-party modules
    • Regulatory content libraries
    • Multi-entity and multi-jurisdiction 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.
Cosign review

Choose MetricStream if

  • You need enterprise and operational risk.
  • You also want regulatory compliance.
MetricStream review

Questions people ask

Is Cosign or MetricStream better?
Neither clearly leads. Cosign starts at Free and MetricStream at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or MetricStream?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for MetricStream.
Does Cosign or MetricStream run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. MetricStream runs on Web.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. MetricStream starts at On request.
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 MetricStream is typically brought in for.
What can Cosign do that MetricStream cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. MetricStream covers Enterprise and operational risk, Regulatory compliance, Internal audit, Third-party risk.

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.

MetricStream: What does MetricStream cost?

It is quoted. Market data suggests roughly 75,000 to 150,000 US dollars a year for small enterprise deployments, 250,000 to 500,000 for medium and 750,000 upwards for large.

Cosign: Is signing alone enough?

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

MetricStream: How long is implementation?

Six to eighteen months for a full platform deployment, and the services cost usually exceeds the first year licence.

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.

MetricStream: Is it right for a mid-market company?

Usually not. Its depth suits organisations with several regulators and formal three lines of defence structures.

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.

MetricStream: Does it replace SOC 2 automation tools?

It can cover the framework, but it is not designed for the automated evidence collection those tools do cheaply.

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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