Cybersecurity · head to head
Cosign vs Restate
Cosign
Cybersecurity
Signs and verifies container images and artifacts, with or without managing keys
- From
- Free
- Free plan
- Yes
Restate
Developer Tools
Durable execution engine in Rust with a free tier and low-latency workflows
- 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.; Restate the runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.
- They diverge on capability: Cosign covers Keyless signing, Restate covers Durable execution.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Cosign and Restate 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 Restate
- Durable execution
- Virtual objects
- Single binary runtime
- Multi-language SDKs
- Workflows and sagas
- Restate Cloud
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 Restate
- Attaching a signed bill of materials to a release so consumers can verify its provenancenot Restate
- Meeting a customer or regulatory requirement for signed artifactsnot Restate
- Verifying third-party images before they enter an internal registrynot Restate
Restate
- Payment or order flows where a crash between two external API calls must not double-charge or lose the ordernot Cosign
- AI agent loops that call tools over minutes or hours and must survive a deployment mid-runnot Cosign
- Replacing hand-rolled retry, idempotency key and outbox code across a set of microservicesnot Cosign
- A small team that wants durable workflows without operating a Temporal cluster and its databasenot 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.
Restate
- The runtime is under a Business Source Licence rather than an open source licence, so building a competing managed offering on it is prohibited and some procurement functions will reject it on licence grounds alone.
- Restate Cloud jumps from a free fifty thousand actions straight to 300 US dollars a month for twenty million, so a workload sitting at a few hundred thousand actions pays enterprise-shaped money for hobby-shaped volume.
- It is a young project against Temporal’s established base, so hiring engineers who already know it is unrealistic and the answer to most questions is in the docs rather than on Stack Overflow.
- The programming model requires structuring code around durable handlers and virtual objects, which is a genuine rewrite for existing services rather than a library you add.
- The single-binary simplicity that makes small deployments cheap also means fewer operational knobs at very large scale than a system designed as separable components.
Pricing, plan by plan
Cosign
Free- CosignFree
- Apache-2.0
- Public Sigstore infrastructure free to use
- No usage limits published
Restate
Free- FreeFree
- Fifty thousand durable actions per month
- No credit card required
- Community support
- Starter$300/month
- Twenty million actions per month
- Two hundred actions per second, bursting to one thousand
- Twenty GB storage
- Pro$1000/month
- Fifty million actions per month
- Five hundred actions per second, bursting to two thousand
- Fifty GB storage
- Enterprise$undefined/year
- Negotiated volume
- Twenty-four seven P0 support
- 99.99 per cent 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.
Choose Restate if
- You need durable execution.
- You want to start without paying.
- You work on Linux, macOS, Web.
- You also want virtual objects.
Questions people ask
- Is Cosign or Restate better?
- Neither clearly leads. Cosign starts at Free and Restate at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cosign or Restate?
- Cosign starts at Free and Restate at Free.
- Does Cosign or Restate run on more platforms?
- Cosign runs on macOS, Linux, Windows, Docker. Restate runs on Linux, macOS, Web.
- 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 Restate is typically brought in for.
- What can Cosign do that Restate cannot?
- Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations. Restate covers Durable execution, Virtual objects, Single binary runtime, Multi-language SDKs.
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.
Restate: Is Restate open source?
The SDKs are MIT. The runtime is under a Business Source Licence, which permits self-hosting but not offering it as a competing service.
Cosign: Is signing alone enough?
No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.
Restate: How does it compare with Temporal?
Same problem, different shape: one Rust binary with embedded storage instead of a server plus database plus workers, and lower per-step latency.
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.
Restate: Is there a free tier?
Yes, fifty thousand durable actions a month on Restate Cloud with no card required.
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.
Restate: Which languages are supported?
TypeScript, Java, Kotlin, Go, Python and Rust.
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
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- Restate vs OWASP ZAP
- Restate vs Wireshark
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- Restate vs Microsoft Intune
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- Restate vs NordVPN
- Restate vs Omada Identity
- Restate vs Ory
- Restate vs ProtonVPN
- Restate vs Grype
- Restate vs Helix
- Restate vs Rust
- Restate vs Atlantis
- Restate vs Jitsu
- Restate vs Okteto
- Restate vs Argo CD
- Restate vs Steampipe
- Restate vs Cloud Native Buildpacks
- Restate vs Deno
- Restate vs Visual Studio Code
- Restate vs Turborepo
- Restate vs Keycloak
- Restate vs Garden
- Restate vs GitLab CI/CD
- Restate vs HCP Terraform
- Restate vs Helm
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