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Cybersecurity · head to head

Cosign vs Mark43

Cosign logo

Cosign

Cybersecurity

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

From
Free
Free plan
Yes
Full reviewWebsite
Mark43 logo

Mark43

Government

Modern Public Safety Software

From
$2000/month
Free plan
No
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.; Mark43 no published pricing on homepage; sales contact required for all cost details
  • They diverge on capability: Cosign covers Keyless signing, Mark43 covers Computer-Aided Dispatch.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and Mark43 actually diverge.

Attributes where Cosign and Mark43 differ
AttributeCosignMark43
Starting priceFree$2000/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsmacOS, Linux, Windows, DockerWeb, Ios, Android
CategoryCybersecurityGovernment
FoundedUnknown2012

Identical on both: 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 Mark43

  • Computer-Aided Dispatch
  • Records Management
  • Evidence Management
  • Analytics
  • Mobile
  • FBI CJIS
  • NCIC
  • State Systems

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 Mark43
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Mark43
  • Meeting a customer or regulatory requirement for signed artifactsnot Mark43
  • Verifying third-party images before they enter an internal registrynot Mark43

Mark43

  • Citizen Servicesnot Cosign
  • Records Managementnot Cosign
  • Public Safetynot Cosign
  • Civic Engagementnot 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.

Mark43

  • No published pricing on homepage; sales contact required for all cost details
  • Only reference to pricing is 'early bird pricing' for 2027 conference registration
  • No transparent pricing structure visible for public evaluation

Pricing, plan by plan

Cosign

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

Mark43

$2000/month
  • Public Safety Suite$2000/month
    • CAD
    • RMS
    • Analytics

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 Mark43 if

  • You need computer-aided dispatch.
  • You work on Web, Ios, Android.
  • You also want records management.
Mark43 review

Questions people ask

Is Cosign or Mark43 better?
Neither clearly leads. Cosign starts at Free and Mark43 at $2000/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or Mark43?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and $2000/month for Mark43.
Does Cosign or Mark43 run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. Mark43 runs on Web, Ios, Android.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Mark43 starts at $2000/month.
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 Mark43 is typically brought in for.
What can Cosign do that Mark43 cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Mark43 covers Computer-Aided Dispatch, Records Management, Evidence Management, Analytics.

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.

Mark43: Does Mark43 publish pricing online?

No, Mark43 pricing is not published on the public website. The only pricing reference is early bird conference registration. Prospective customers must contact Mark43 through 'Book A Demo' or 'Let's Connect' for pricing consultation.

Source
Cosign: Is signing alone enough?

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

Mark43: What payment methods or financing options does Mark43 offer?

No information about payment methods or financing options is disclosed on the public homepage. Pricing and payment details are handled through direct sales consultations.

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.

Mark43: Are there volume discounts or specialized pricing for different agency sizes?

Mark43 website does not disclose any volume pricing, per-user costs, or specialized rates for agencies of different sizes. All pricing inquiries require direct contact with sales team.

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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