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Cybersecurity · head to head

Cosign vs PhpStorm

Cosign logo

Cosign

Cybersecurity

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

From
Free
Free plan
Yes
Full reviewWebsite
PhpStorm logo

PhpStorm

Developer Tools

JetBrains IDE for PHP web development

From
$24/month
Free plan
No
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.; PhpStorm requires an ongoing paid subscription with no free tier for commercial use.
  • They diverge on capability: Cosign covers Keyless signing, PhpStorm covers PHP-aware coding assistance.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and PhpStorm actually diverge.

Attributes where Cosign and PhpStorm differ
AttributeCosignPhpStorm
Starting priceFree$24/month
Pricing modelOpen source, no licence feesubscription
Free tierYesNo
PlatformsmacOS, Linux, Windows, Dockerwindows, mac, linux
CategoryCybersecurityDeveloper Tools
FoundedUnknown2000

Identical on both: user rating (Not yet rated).

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 PhpStorm

  • PHP-aware coding assistance
  • Integrated debugger
  • Front-end tooling
  • Database tools
  • Version control integration
  • Docker and remote deployment

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

PhpStorm

  • Building PHP web applications with Laravel or Symfonynot Cosign
  • Debugging PHP code with Xdebugnot Cosign
  • Working across PHP, HTML, CSS, and JavaScript in one projectnot Cosign
  • Managing databases alongside application codenot 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.

PhpStorm

  • Requires an ongoing paid subscription with no free tier for commercial use.
  • Heavier and slower to start than lightweight code editors.
  • Some advanced framework-specific tooling requires additional configuration or plugins.
  • Renewal pricing rises for lapsed subscriptions after the grace period.

Pricing, plan by plan

Cosign

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

PhpStorm

$24/month
  • Individual$24/month
    • Personal use license
    • Access to PhpStorm
    • Free for students and open-source maintainers
  • Organization$34/month
    • Business use license
    • Access to PhpStorm
    • Volume and renewal discounts

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 PhpStorm if

  • You need php-aware coding assistance.
  • You work on windows, mac, linux.
  • You also want integrated debugger.
PhpStorm review

Questions people ask

Is Cosign or PhpStorm better?
Neither clearly leads. Cosign starts at Free and PhpStorm at $24/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or PhpStorm?
Cosign has a free tier; the other does not. Paid plans start at Free for Cosign and $24/month for PhpStorm.
Does Cosign or PhpStorm run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. PhpStorm runs on windows, mac, linux.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. PhpStorm starts at $24/month.
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 PhpStorm is typically brought in for.
What can Cosign do that PhpStorm cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. PhpStorm covers PHP-aware coding assistance, Integrated debugger, Front-end tooling, Database tools.

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.

PhpStorm: How much does PhpStorm cost?

PhpStorm is sold via JetBrains Toolbox subscription starting around $24/month for individuals and $34/month for organizations, with free licenses for students and open-source maintainers.

Source
Cosign: Is signing alone enough?

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

PhpStorm: Is there a free trial?

JetBrains offers a free trial of PhpStorm so developers can test it before subscribing.

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.

PhpStorm: What platforms does PhpStorm support?

PhpStorm is a desktop IDE available on Windows, macOS, and Linux via JetBrains Toolbox.

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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