Cybersecurity · head to head
Cosign vs Hookdeck
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Free plan
- Yes
Hookdeck
Developer Tools
Event gateway that receives, queues, retries and replays inbound webhooks
- From
- Free
- Free plan
- Yes
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.; Hookdeck pricing meters delivered events, so fan-out multiplies the bill: one inbound event routed to four services counts as four deliveries.
- They diverge on capability: Cosign covers Keyless signing, Hookdeck covers Ingest and persist.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Hookdeck actually diverge.
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 Hookdeck
- Ingest and persist
- Automatic retries
- Filters and fan-out
- Transformations
- Local development CLI
- Rate limiting
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 Hookdeck
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Hookdeck
- Meeting a customer or regulatory requirement for signed artifactsnot Hookdeck
- Verifying third-party images before they enter an internal registrynot Hookdeck
Hookdeck
- A payments integration where losing a Stripe event during a deploy causes an order to go unfulfillednot Cosign
- Fanning one provider webhook out to several internal services without each subscribing separatelynot Cosign
- Debugging a partner integration by replaying the exact failing payload after shipping a fixnot Cosign
- Receiving production-shaped webhooks on a developer laptop without running a public tunnelnot 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.
Hookdeck
- Pricing meters delivered events, so fan-out multiplies the bill: one inbound event routed to four services counts as four deliveries.
- Free-tier retention is three days, which is shorter than the time it typically takes to notice a failing integration, so the payloads needed for a replay are often already gone.
- It becomes a single point of failure in front of every third-party integration, and an outage there means every provider webhook queues or fails at once.
- The transformation layer runs JavaScript in a constrained environment, so anything that needs a database lookup or an external call has to happen downstream instead.
- For a team already running Kafka or SQS the value is mostly the console and the replay UI, which is a hard cost to justify against infrastructure they already operate.
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Hookdeck
Free- DeveloperFree
- Up to ten thousand events per month
- Three-day retention
- One user
- Team$39/month
- Ten thousand events included
- Unlimited users
- Pay as you go metering above the included events
- Growth$499/month
- Ten thousand events included plus metered usage
- Thirty-day retention
- Uptime and latency SLAs
- Enterprise$undefined/year
- Negotiated event volume
- Custom retention
- Dedicated support
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 Hookdeck if
- You need ingest and persist.
- You want to start without paying.
- You work on Web, Linux, macOS, Windows.
- You also want automatic retries.
Questions people ask
- Is Cosign or Hookdeck better?
- Neither clearly leads. Cosign starts at Free and Hookdeck at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Hookdeck?
- Cosign starts at Free and Hookdeck at Free.
- Does Cosign or Hookdeck run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Hookdeck runs on Web, Linux, macOS, Windows.
- 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 Hookdeck is typically brought in for.
- What can Cosign do that Hookdeck cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Hookdeck covers Ingest and persist, Automatic retries, Filters and fan-out, Transformations.
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.
Hookdeck: Is there a free plan?
Yes, ten thousand events a month with three-day retention and one user.
Cosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Hookdeck: How is usage counted?
By delivered events, so a single inbound webhook fanned out to three destinations counts as three.
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.
Hookdeck: Can I replay a failed webhook?
Yes, individually or in bulk from the console, with the original payload.
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.
Hookdeck: Does it work for outbound webhooks too?
Yes, the same queueing, retry and observability applies to webhooks you send.
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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