Cybersecurity · head to head
Cosign vs Splunk Enterprise Security
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Rated
- -
Splunk Enterprise Security
Cybersecurity
The platform for operational intelligence
- 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.; Splunk Enterprise Security splunk Enterprise Security is licensed separately from the Splunk platform, so a SIEM deployment needs both
- They diverge on capability: Cosign covers Keyless signing, Splunk Enterprise Security covers Security monitoring.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Splunk Enterprise Security actually diverge.
| Attribute | Cosign | Splunk Enterprise Security |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | Open source, no licence fee | subscription |
| Free tier | Yes | No |
| Platforms | macOS, Linux, Windows, Docker | Web, Api |
| Founded | Unknown | 2003 |
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 Splunk Enterprise Security
- Security monitoring
- Incident review
- Risk-based alerting
- Threat intelligence
- Investigation workbench
- MITRE ATT&CK mapping
- Automated response
- Compliance reporting
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 Splunk Enterprise Security
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Splunk Enterprise Security
- Meeting a customer or regulatory requirement for signed artifactsnot Splunk Enterprise Security
- Verifying third-party images before they enter an internal registrynot Splunk Enterprise Security
Splunk Enterprise Security
- Running a security operations centre on Splunk indexed log datanot Cosign
- Correlation searches, risk based alerting and incident investigationnot Cosign
- Compliance reporting from pooled security telemetrynot 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.
Splunk Enterprise Security
- Splunk Enterprise Security is licensed separately from the Splunk platform, so a SIEM deployment needs both
- Splunk publishes no rate for Enterprise Security and directs buyers to contact a pricing expert
- UEBA, SOAR and automated threat analysis require the Premier edition rather than Essentials
- The platform underneath can be billed by ingest volume, workload or activity, so the total cost depends on a pricing model chosen at contract time rather than a list price
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Splunk Enterprise Security
On request- Workload PricingFree
- Pay per compute
- Flexible scaling
- All features
- Ingest PricingFree
- Pay per GB ingested
- Predictable costs
- All features
- Entity PricingFree
- Pay per monitored entity
- Security focused
- All features
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 Splunk Enterprise Security if
- You need security monitoring.
- You work on Web, Api.
- You also want incident review.
Questions people ask
- Is Cosign or Splunk Enterprise Security better?
- Neither clearly leads. Cosign starts at Free and Splunk Enterprise Security at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Splunk Enterprise Security?
- Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for Splunk Enterprise Security.
- Does Cosign or Splunk Enterprise Security run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Splunk Enterprise Security runs on Web, Api.
- Can I use Cosign for free?
- Yes. Cosign has a free tier, so you can try it without paying. Splunk Enterprise 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 Splunk Enterprise Security is typically brought in for.
- What can Cosign do that Splunk Enterprise Security cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Splunk Enterprise Security covers Security monitoring, Incident review, Risk-based alerting, Threat intelligence.
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.
Splunk Enterprise Security: How much does Splunk Enterprise Security cost?
Splunk Enterprise Security pricing is not published. The product is available in Essentials Edition with threat detection, investigation, and response capabilities, and Premier Edition with UEBA, SOAR, and Automated Threat Analysis. Customers must contact Splunk sales for pricing quotes on either edition.
SourceCosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Splunk Enterprise Security: What editions of Splunk Enterprise Security are available?
Splunk Enterprise Security offers Essentials Edition with threat detection, investigation, and response capabilities, and Premier Edition which adds UEBA (User and Entity Behavior Analytics), SOAR (Security Orchestration, Automation and Response), and Automated Threat Analysis.
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.
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
More on Splunk Enterprise Security
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