Cybersecurity · head to head
Cosign vs Metasploit
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Metasploit
Cybersecurity
The world's most used penetration testing framework
- From
- Free
- Rated
- -
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.; Metasploit the free Framework edition is command line only; the web interface is Pro only
- They diverge on capability: Cosign covers Keyless signing, Metasploit covers Exploit database.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Metasploit actually diverge.
| Attribute | Cosign | Metasploit |
|---|---|---|
| Pricing model | Open source, no licence fee | freemium |
| Platforms | macOS, Linux, Windows, Docker | Desktop, Cli |
| Founded | Unknown | 2000 |
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 Metasploit
- Exploit database
- Payload generation
- Post-exploitation
- Evasion modules
- Auxiliary scanners
- Social engineering
- Credential harvesting
- Session 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 Metasploit
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Metasploit
- Meeting a customer or regulatory requirement for signed artifactsnot Metasploit
- Verifying third-party images before they enter an internal registrynot Metasploit
Metasploit
- Penetration testing and exploit development against known vulnerabilitiesnot Cosign
- Validating whether a reported vulnerability is actually exploitablenot Cosign
- Running phishing and credential attack simulations on the Pro editionnot 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.
Metasploit
- The free Framework edition is command line only; the web interface is Pro only
- Automated exploitation, automated credential attacks and antivirus evading dynamic payloads are restricted to Metasploit Pro
- Reporting, audit wizards, task chains and closed loop vulnerability validation are Pro only
- Rapid7 publishes no price for Metasploit Pro and routes buyers to contact sales
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Metasploit
Free- Metasploit Framework (OSS)Free
- Open source
- 1500+ exploits
- Command line
- Metasploit ProFree
- Web interface
- Automated testing
- Phishing campaigns
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 Metasploit if
- You need exploit database.
- You want to start without paying.
- You work on Desktop, Cli.
- You also want payload generation.
Questions people ask
- Is Cosign or Metasploit better?
- Neither clearly leads. Cosign starts at Free and Metasploit at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Metasploit?
- Cosign starts at Free and Metasploit at Free.
- Does Cosign or Metasploit run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Metasploit runs on Desktop, Cli.
- 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 Metasploit is typically brought in for.
- What can Cosign do that Metasploit cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Metasploit covers Exploit database, Payload generation, Post-exploitation, Evasion modules.
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.
Metasploit: Is Metasploit Framework free to use?
Yes, Metasploit Framework is available as free open-source software with source code accessible via GitHub. Community support is provided through Slack, GitHub, Twitter, and email.
SourceCosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Metasploit: What is the difference between Metasploit Framework and Metasploit Pro?
Metasploit Framework is the free open-source version. Metasploit Pro is a commercial offering with customer support from Rapid7, though specific pricing and features are not detailed on the download page.
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.
Metasploit: What support is available for the free Framework version?
Community-based support for Metasploit Framework is available through Slack, GitHub, Twitter, and email ([email protected]). Commercial customers using Metasploit Pro receive customer support from Rapid7.
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.
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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