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Cybersecurity · head to head

Cosign vs SentinelOne

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
SentinelOne logo

SentinelOne

Cybersecurity

Autonomous endpoint protection and response

From
On request
Rated
-
Full reviewWebsite

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.; SentinelOne enterprise pricing requires contacting sales
  • They diverge on capability: Cosign covers Keyless signing, SentinelOne covers AI-powered detection.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and SentinelOne actually diverge.

Attributes where Cosign and SentinelOne differ
AttributeCosignSentinelOne
Starting priceFreeOn request
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsmacOS, Linux, Windows, DockerWindows, Macos, Linux, Ios, Android
FoundedUnknown2013

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 SentinelOne

  • AI-powered detection
  • Autonomous response
  • Behavioral threat intelligence
  • Root cause analysis
  • Threat hunting automation
  • Ransomware protection
  • Container security
  • Mobile endpoint protection

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

SentinelOne

  • Endpoint detection and responsenot Cosign
  • AI-powered threat huntingnot Cosign
  • Cloud workload securitynot 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.

SentinelOne

  • Enterprise pricing requires contacting sales
  • Prices shown for 5-100 workstations may differ for larger deployments
  • Purchases must be made through authorized third-party partners

Pricing, plan by plan

Cosign

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

SentinelOne

On request
  • Singularity Complete$179.99/year
    • Per endpoint pricing
    • AI-driven endpoint and cloud workload protection
    • Real-time threat detection and response
  • Singularity Commercial$229.99/year
    • Per endpoint pricing
    • All Complete features plus Identity Detection and Response
    • 90-day data retention
  • Singularity Enterprise$null/custom
    • Per endpoint pricing
    • All Commercial features plus Agentic AI SOC Analyst
    • Full Visibility and Forensics

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 SentinelOne if

  • You need ai-powered detection.
  • You work on Windows, Macos, Linux, Ios, Android.
  • You also want autonomous response.
SentinelOne review

Questions people ask

Is Cosign or SentinelOne better?
Neither clearly leads. Cosign starts at Free and SentinelOne at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or SentinelOne?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and On request for SentinelOne.
Does Cosign or SentinelOne run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. SentinelOne runs on Windows, Macos, Linux, Ios, Android.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. SentinelOne 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 SentinelOne is typically brought in for.
What can Cosign do that SentinelOne cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. SentinelOne covers AI-powered detection, Autonomous response, Behavioral threat intelligence, Root cause 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.

SentinelOne: What is SentinelOne Singularity Complete pricing?

Singularity Complete costs $179.99 per endpoint per year and includes AI-driven endpoint and cloud workload protection, real-time threat detection and response, 14-day data retention, and AI Security Assistant. Pricing shown for 5-100 workstations.

Source
Cosign: Is signing alone enough?

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

SentinelOne: What features distinguish SentinelOne Commercial from Complete?

Singularity Commercial costs $229.99 per endpoint per year (versus $179.99 for Complete) and adds Identity Detection and Response, 90-day data retention (compared to 14-day), and Managed Threat Hunting services.

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.

SentinelOne: How does partner pricing affect SentinelOne costs?

All SentinelOne purchases are made through authorized third-party partners, and partner pricing may differ from published rates. Customers should verify pricing with their authorized reseller.

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.

SentinelOne: What does SentinelOne Enterprise include?

Singularity Enterprise (custom pricing, contact sales) adds Agentic AI SOC Analyst and Full Visibility and Forensics capabilities to all Commercial features, plus expert-led onboarding and training.

Source
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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