Cybersecurity · head to head
Cosign vs Sardine
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Sardine
Cybersecurity
Device intelligence and behaviour biometrics for fraud and compliance
- From
- On request
- Rated
- -
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.; Sardine signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.
- They diverge on capability: Cosign covers Keyless signing, Sardine covers Device intelligence.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Cosign and Sardine actually diverge.
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 Sardine
- Device intelligence
- Behaviour biometrics
- Scam detection
- Onboarding risk scoring
- AML transaction monitoring
- Dispute and chargeback handling
- Rules editor
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 Sardine
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Sardine
- Meeting a customer or regulatory requirement for signed artifactsnot Sardine
- Verifying third-party images before they enter an internal registrynot Sardine
Sardine
- A neobank losing money to authorised push payment scams where the customer genuinely approved the transfernot Cosign
- A crypto exchange trying to detect accounts being operated by remote access rather than by their ownernot Cosign
- A fintech seeing synthetic identity signups that pass document verification but share device characteristicsnot Cosign
- A lender wanting first party fraud signals at application time that a credit bureau file does not containnot 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.
Sardine
- Signal quality depends on the SDK being embedded in your own web and mobile clients, so fraud improvements become dependent on your app release cycle and any coverage gap is a blind spot.
- Behavioural and device telemetry collection needs a documented lawful basis under GDPR, and EU privacy reviews frequently delay rollouts that were scoped as engineering work.
- Pricing is per session or per active user, so a consumer product with many low value sessions pays in proportion to traffic rather than to fraud exposure.
- As a younger private company it lacks the enforcement-tested audit history that a bank examiner expects, which makes it a harder sell inside a regulated bank than inside a fintech.
- It is strongest on session-time signals and weaker as a system of record for long horizon AML typologies, so larger institutions end up running it alongside a traditional monitoring platform rather than instead of one.
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Sardine
On request- Sardine$undefined/year
- Priced per user session or per monthly active user
- Annual contract with volume commitment
- SDK for web, iOS and Android
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.
Choose Sardine if
- You need device intelligence.
- You work on Web, iOS, Android.
- You also want behaviour biometrics.
Questions people ask
- Is Cosign or Sardine better?
- Neither clearly leads. Cosign starts at Free and Sardine at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Sardine?
- Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for Sardine.
- Does Cosign or Sardine run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Sardine runs on Web, iOS, Android.
- Can I use Cosign for free?
- Yes. Cosign has a free tier, so you can try it without paying. Sardine 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 Sardine is typically brought in for.
- What can Cosign do that Sardine cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Sardine covers Device intelligence, Behaviour biometrics, Scam detection, Onboarding risk scoring.
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.
Sardine: Does Sardine do document verification?
It focuses on device, behavioural and transaction signals, and integrates identity verification providers rather than being one. Treat it as complementary to a KYC vendor.
Cosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Sardine: What does it need from us to work?
An SDK in your web and mobile applications plus transaction feeds. Without the client side collector you lose the signals that differentiate it.
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.
Sardine: Is pricing published?
No. It is quoted, typically per session or per monthly active user with an annual volume commitment.
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.
Related pages
Other head to heads
- Cosign vs Sigstore
- Cosign vs Syft
- Cosign vs Chainguard
- Cosign vs HashiCorp Vault
- Cosign vs Infisical
- Cosign vs OWASP ZAP
- Cosign vs Wireshark
- Cosign vs Bitwarden
- Cosign vs Semgrep
- Cosign vs Trivy
- Cosign vs authentik
- Cosign vs Microsoft Intune
- Cosign vs Netwrix
- Cosign vs NordVPN
- Cosign vs Omada Identity
- Cosign vs Ory
- Cosign vs ProtonVPN
- Cosign vs Grype
- Cosign vs Unit21
- Cosign vs Featurespace ARIC Risk Hub
- Cosign vs Feedzai
- Cosign vs NICE Actimize
- Cosign vs Socure
- Cosign vs ThetaRay
- Cosign vs Transmit Security
- Cosign vs Jumio
- Cosign vs iDenfy
- Cosign vs Silent Eight
- Cosign vs Sumsub
- Cosign vs Quantexa
- Cosign vs TunnelBear
- Cosign vs Vanta
- Cosign vs Acunetix
- Cosign vs Aikido
- Cosign vs Arnica
- Cosign vs Authelia
- Sardine vs Sigstore
- Sardine vs Syft
- Sardine vs Chainguard
- Sardine vs HashiCorp Vault
- Sardine vs Infisical
- Sardine vs OWASP ZAP
- Sardine vs Wireshark
- Sardine vs Bitwarden
- Sardine vs Semgrep
- Sardine vs Trivy
- Sardine vs authentik
- Sardine vs Microsoft Intune
- Sardine vs Netwrix
- Sardine vs NordVPN
- Sardine vs Omada Identity
- Sardine vs Ory
- Sardine vs ProtonVPN
- Sardine vs Grype
- Sardine vs Unit21
- Sardine vs Featurespace ARIC Risk Hub
- Sardine vs Feedzai
- Sardine vs NICE Actimize
- Sardine vs Socure
- Sardine vs ThetaRay
- Sardine vs Transmit Security
- Sardine vs Jumio
- Sardine vs iDenfy
- Sardine vs Silent Eight
- Sardine vs Sumsub
- Sardine vs Quantexa
- Sardine vs TunnelBear
- Sardine vs Vanta
- Sardine vs Acunetix
- Sardine vs Aikido
- Sardine vs Arnica
- Sardine vs Authelia