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Cybersecurity · head to head

Cosign vs Endor Labs

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
Endor Labs logo

Endor Labs

Cybersecurity

Security and AI agent governance for code and supply chain

From
Free
Rated
-
Full reviewWebsite

The short version

  • 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.; Endor Labs pricing requires contacting sales, no transparent rates
  • They diverge on capability: Cosign covers Keyless signing, Endor Labs covers AI coding agent governance.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and Endor Labs actually diverge.

Attributes where Cosign and Endor Labs differ
AttributeCosignEndor Labs
Pricing modelOpen source, no licence feeSeat-based per contributing developer with volume discounts
PlatformsmacOS, Linux, Windows, DockerWeb, CLI, IDE
FoundedUnknown2021

Identical on both: starting price (Free), free tier (Yes), 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 Endor Labs

  • AI coding agent governance
  • SAST scanning
  • Secrets detection
  • Reachability analysis
  • Open source dependency scanning
  • Package firewall
  • MCP server integration

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

Endor Labs

  • Securing AI coding agent outputs before deploymentnot Cosign
  • Reducing SAST false positives with reachability analysisnot Cosign
  • Managing open source supply chain risknot Cosign
  • Enforcing security policies in CI/CD pipelinesnot 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.

Endor Labs

  • Pricing requires contacting sales, no transparent rates
  • Developer tier lacks UI and historical scan data
  • Free tier limited to local scanning only
  • Seat-based model may become expensive for large teams

Pricing, plan by plan

Cosign

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

Endor Labs

Free
  • DeveloperFree
    • Local scanning
    • Read-only vulnerability data
    • No UI, policies, or scan history

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 Endor Labs if

  • You need ai coding agent governance.
  • You want to start without paying.
  • You work on Web, CLI, IDE.
  • You also want sast scanning.
Endor Labs review

Questions people ask

Is Cosign or Endor Labs better?
Neither clearly leads. Cosign starts at Free and Endor Labs at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or Endor Labs?
Cosign starts at Free and Endor Labs at Free.
Does Cosign or Endor Labs run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. Endor Labs runs on Web, CLI, IDE.
Can I use Cosign for free?
Both have a free tier, so you can try either at no cost before committing.
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 Endor Labs is typically brought in for.
What can Cosign do that Endor Labs cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Endor Labs covers AI coding agent governance, SAST scanning, Secrets detection, Reachability analysis.

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.

Endor Labs: What is the difference between Endor Labs Developer and paid tiers?

Developer tier is free and provides local scanning via MCP server with read-only vulnerability access and no UI. Paid tiers (Core and Pro) add team features like policy enforcement, enterprise integrations, reporting, and scan history.

Source
Cosign: Is signing alone enough?

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

Endor Labs: How does Endor Labs define seats for pricing?

Seats are calculated per contributing developer (those with commits in monitored repositories within the last 90 days). Volume discounts apply as team size grows.

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.

Endor Labs: Does Endor Labs support on-premises deployment?

The platform is cloud-based SaaS by default. Enterprise customers should contact sales to discuss custom deployment options.

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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