Cybersecurity · head to head
Cosign vs Fenergo
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Fenergo
Cybersecurity
Client lifecycle management and KYC onboarding for regulated financial institutions
- 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.; Fenergo implementations commonly run twelve to twenty-four months and depend on a systems integrator, so the services cost frequently exceeds the software subscription in year one.
- They diverge on capability: Cosign covers Keyless signing, Fenergo covers Regulatory rules library.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Cosign and Fenergo 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 Fenergo
- Regulatory rules library
- Digital onboarding
- Perpetual KYC
- Entity data model
- Screening orchestration
- Case management
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 Fenergo
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Fenergo
- Meeting a customer or regulatory requirement for signed artifactsnot Fenergo
- Verifying third-party images before they enter an internal registrynot Fenergo
Fenergo
- A bank operating in twenty jurisdictions that cannot keep local KYC requirements current across separate regional teamsnot Cosign
- A custodian moving from calendar-based periodic review to event-driven perpetual KYC to cut analyst headcountnot Cosign
- An asset manager onboarding funds and trusts where the ownership hierarchy defeats generic identity verification toolsnot Cosign
- A payments institution facing a regulatory remediation order and needing a defensible audit trail of every client reviewnot 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.
Fenergo
- Implementations commonly run twelve to twenty-four months and depend on a systems integrator, so the services cost frequently exceeds the software subscription in year one.
- It orchestrates screening but does not supply the sanctions, PEP or adverse media data, so you still buy Dow Jones, LexisNexis or World-Check separately and those fees are per screened entity.
- The entry price is set for institutions with large onboarding volumes, which puts it out of reach of smaller banks and fintechs that would otherwise benefit from the rules library.
- Configuration is deep and specific, which makes upgrades between major versions a project rather than a patch, and some customers stay on old releases for years.
- The rules library covers regulatory requirements, not your internal risk appetite, so the policy tuning that determines whether onboarding actually gets faster remains your work.
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Fenergo
On request- Fenergo Client Lifecycle Management$undefined/year
- Priced by institution size, jurisdictions in scope and modules licensed
- Regulatory rules content subscription bundled into the annual fee
- Implementation delivered by Fenergo or a systems integrator and quoted separately
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.
Questions people ask
- Is Cosign or Fenergo better?
- Neither clearly leads. Cosign starts at Free and Fenergo at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Fenergo?
- Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for Fenergo.
- Does Cosign or Fenergo run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Fenergo runs on Web.
- Can I use Cosign for free?
- Yes. Cosign has a free tier, so you can try it without paying. Fenergo 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 Fenergo is typically brought in for.
- What can Cosign do that Fenergo cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Fenergo covers Regulatory rules library, Digital onboarding, Perpetual KYC, Entity data model.
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.
Fenergo: Does Fenergo do the sanctions screening itself?
No. It orchestrates calls to third-party data providers such as Dow Jones and World-Check, and those subscriptions are additional and usually charged per screened entity.
Cosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Fenergo: Is it SaaS or on-premises?
Both. The SaaS offering runs on Microsoft Azure with regional deployment options, which matters where data residency rules prohibit client data leaving the jurisdiction.
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.
Fenergo: How long does a deployment take?
Plan for a year at minimum for a multi-jurisdiction rollout. Single-jurisdiction deployments with a narrow product set can be shorter but rarely under six months.
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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