Cybersecurity · head to head
Cosign vs Legit Security
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Legit Security
Cybersecurity
AI-native ASPM platform securing AI-generated code before deployment
- 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.; Legit Security pricing requires contacting sales, making cost comparison difficult
- They diverge on capability: Cosign covers Keyless signing, Legit Security covers VibeGuard AI code scanning.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Legit Security actually diverge.
| Attribute | Cosign | Legit Security |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | Open source, no licence fee | Contact sales for custom pricing |
| Free tier | Yes | No |
| Platforms | macOS, Linux, Windows, Docker | Web, IDE, CI/CD |
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 Legit Security
- VibeGuard AI code scanning
- Unified vulnerability remediation
- Code Security (SAST/SCA)
- Secrets detection and prevention
- Software Supply Chain Security
- Code change detection
- AI-powered remediation
- Risk scoring
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 Legit Security
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Legit Security
- Meeting a customer or regulatory requirement for signed artifactsnot Legit Security
- Verifying third-party images before they enter an internal registrynot Legit Security
Legit Security
- Securing AI-generated code from GitHub Copilot and IDE assistantsnot Cosign
- Consolidating vulnerability findings from multiple AppSec toolsnot Cosign
- Preventing credential leaks across development workspacesnot Cosign
- Automating remediation workflows with AI-powered suggestionsnot Cosign
- Compliance automation with SBOM generation and enforcementnot 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.
Legit Security
- Pricing requires contacting sales, making cost comparison difficult
- No published pricing tiers or free tier available
- Requires integration with existing SAST and SCA tools for full capability
- Focused primarily on code security within development lifecycle
- Newer entrant with less market presence than established competitors
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Legit Security
On requestNo published plan breakdown. See the Legit Security review.
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 Legit Security if
- You need vibeguard ai code scanning.
- You work on Web, IDE, CI/CD.
- You also want unified vulnerability remediation.
Questions people ask
- Is Cosign or Legit Security better?
- Neither clearly leads. Cosign starts at Free and Legit Security at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Legit Security?
- Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for Legit Security.
- Does Cosign or Legit Security run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Legit Security runs on Web, IDE, CI/CD.
- Can I use Cosign for free?
- Yes. Cosign has a free tier, so you can try it without paying. Legit Security 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 Legit Security is typically brought in for.
- What can Cosign do that Legit Security cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Legit Security covers VibeGuard AI code scanning, Unified vulnerability remediation, Code Security (SAST/SCA), Secrets detection and prevention.
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.
Legit Security: What is VibeGuard and how does it work?
VibeGuard is Legit Security's core feature that scans AI-generated code directly within IDEs like GitHub Copilot and Cursor, identifying vulnerabilities before code leaves the developer's editor.
SourceCosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Legit Security: What AI code assistants does Legit Security support?
Legit Security integrates with GitHub Copilot, Cursor, and Claude to scan AI-generated code for vulnerabilities.
SourceCosign: 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.
Legit Security: How does Legit Security's AI remediation feature work?
The platform uses AI to suggest specific code fixes for identified vulnerabilities and can automatically create tickets in Jira with full context for developers to review and apply.
SourceCosign: 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.
Legit Security: Does Legit Security support compliance reporting?
Yes, Legit Security automates compliance automation with SBOM generation and can generate compliance reports for security and regulatory requirements.
SourceCosign: 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
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