Softwr

Government · head to head

Citizen vs Cosign

Citizen logo

Citizen

Government

Real-time Safety Alerts

From
Free
Free plan
Yes
Full reviewWebsite
Cosign logo

Cosign

Cybersecurity

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

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Citizen no premium or paid features mentioned; 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.
  • They diverge on capability: Citizen covers Real-time Alerts, Cosign covers Keyless signing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Citizen and Cosign actually diverge.

Attributes where Citizen and Cosign differ
AttributeCitizenCosign
Pricing modelfreemiumOpen source, no licence fee
PlatformsIos, AndroidmacOS, Linux, Windows, Docker
CategoryGovernmentCybersecurity
Founded2016Unknown

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 Citizen

  • Real-time Alerts
  • 911 Monitoring
  • Live Video
  • Safety Map
  • Personal Safety
  • Emergency Services
  • Social Media
  • Location Services

Only in Cosign

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

What people use each for

The jobs each tool is most often brought in to do.

Citizen

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

Cosign

  • Signing container images in a build pipeline without managing long-lived private keysnot Citizen
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Citizen
  • Meeting a customer or regulatory requirement for signed artifactsnot Citizen
  • Verifying third-party images before they enter an internal registrynot Citizen

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Citizen

  • No premium or paid features mentioned
  • App is completely free with no monetization model disclosed
  • No in-app purchases or premium tier mentioned
  • Subscription or paid features may exist but not disclosed

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.

Pricing, plan by plan

Citizen

Free
  • BasicFree
    • Real-time Alerts
    • Incident Feed
    • Safety Map

Cosign

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

Which should you pick?

Choose Citizen if

  • You need real-time alerts.
  • You want to start without paying.
  • You work on Ios, Android.
  • You also want 911 monitoring.
Citizen review

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

Questions people ask

Is Citizen or Cosign better?
Neither clearly leads. Citizen starts at Free and Cosign at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Citizen or Cosign?
Citizen starts at Free and Cosign at Free.
Does Citizen or Cosign run on more platforms?
Citizen runs on Ios, Android. Cosign runs on macOS, Linux, Windows, Docker.
Can I use Citizen for free?
Both have a free tier, so you can try either at no cost before committing.
What is Citizen best used for?
Citizen is most often used for citizen services, records management, public safety, civic engagement. Of those, citizen services and records management are not what Cosign is typically brought in for.
What can Citizen do that Cosign cannot?
Citizen covers Real-time Alerts, 911 Monitoring, Live Video, Safety Map. Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations.

Answered from the vendors’ own pages

Citizen: How much does Citizen cost?

Citizen is available as a free app download for iOS and Android. The app includes core safety and alert features at no cost.

Source
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.

Citizen: Are there paid features or premium subscriptions in Citizen?

Citizen's website does not mention paid features, premium subscriptions, or in-app purchases. All advertised features appear to be included in the free app.

Source
Cosign: Is signing alone enough?

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

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.

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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