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Cybersecurity · head to head

Cosign vs WSO2 API Manager

Cosign logo

Cosign

Cybersecurity

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

From
Free
Rated
-
Full reviewWebsite
WSO2 API Manager logo

WSO2 API Manager

APIs

Complete API management platform for designing and managing APIs

From
Free
Rated
-
Full reviewWebsite

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.; WSO2 API Manager the free open source distribution does not include a subscription to the WSO2 Update service, so continuous improvements and security patches require a paid subscription
  • They diverge on capability: Cosign covers Keyless signing, WSO2 API Manager covers API Gateway.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Cosign and WSO2 API Manager actually diverge.

Attributes where Cosign and WSO2 API Manager differ
AttributeCosignWSO2 API Manager
Pricing modelOpen source, no licence feeopen-source
PlatformsmacOS, Linux, Windows, DockerJava, Linux, Docker, Kubernetes
CategoryCybersecurityAPIs
FoundedUnknown2005

Identical on both: starting price (Free), free tier (Yes), 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 WSO2 API Manager

  • API Gateway
  • API Designer
  • Developer Portal
  • LDAP
  • Okta
  • Keycloak
  • Microservices
  • Java support

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 WSO2 API Manager
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot WSO2 API Manager
  • Meeting a customer or regulatory requirement for signed artifactsnot WSO2 API Manager
  • Verifying third-party images before they enter an internal registrynot WSO2 API Manager

WSO2 API Manager

  • Publishing, securing and rate limiting APIs behind a gatewaynot Cosign
  • Running an API developer portal with subscription key managementnot Cosign
  • Self hosting an open source API management layer on premisesnot 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.

WSO2 API Manager

  • The free open source distribution does not include a subscription to the WSO2 Update service, so continuous improvements and security patches require a paid subscription
  • A commercial production licence is not part of the free download and comes only with a subscription
  • No subscription price is published; Basic Support and Enterprise Support both require contacting sales for a quote
  • 24x7x365 coverage requires Enterprise Support; the general query SLA is one business day
  • A Customer Success Manager is a paid optional add on covering business hours only
  • Consulting services and WSO2 Private Cloud hosting are quoted separately

Pricing, plan by plan

Cosign

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

WSO2 API Manager

Free
  • CommunityFree
    • Core API management
    • Community support
  • Commercial$undefined/monthly
    • Enterprise features
    • Technical support
    • SLA

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 WSO2 API Manager if

  • You need api gateway.
  • You want to start without paying.
  • You work on Java, Linux, Docker, Kubernetes.
  • You also want api designer.
WSO2 API Manager review

Questions people ask

Is Cosign or WSO2 API Manager better?
Neither clearly leads. Cosign starts at Free and WSO2 API Manager at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cosign or WSO2 API Manager?
Cosign starts at Free and WSO2 API Manager at Free.
Does Cosign or WSO2 API Manager run on more platforms?
Cosign runs on macOS, Linux, Windows, Docker. WSO2 API Manager runs on Java, Linux, Docker, Kubernetes.
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 WSO2 API Manager is typically brought in for.
What can Cosign do that WSO2 API Manager cannot?
Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. WSO2 API Manager covers API Gateway, API Designer, Developer Portal, LDAP.

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.

WSO2 API Manager: How is WSO2 API Manager priced?

WSO2 API Manager pricing is not published on their website. As an enterprise API management platform, pricing is custom-quoted based on deployment model and organizational requirements.

Source
Cosign: Is signing alone enough?

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

WSO2 API Manager: Does WSO2 API Manager offer different pricing for on-premises versus cloud deployments?

WSO2 API Manager supports multiple deployment options including on-premises and cloud, but pricing structures for different deployment models are not publicly disclosed.

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.

WSO2 API Manager: What deployment flexibility does WSO2 API Manager provide?

WSO2 API Manager enables flexible deployment on-premises or in cloud environments, but specific pricing tiers for each deployment model require contacting WSO2 sales.

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.

WSO2 API Manager: How would I request a WSO2 API Manager pricing quote?

Organizations can request pricing quotes by contacting WSO2 sales through their website. Custom quotes depend on API volume, deployment model, and feature requirements.

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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