Side by side

AWS Signer vs Sigstore

Both stand on code signing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

AWS Signer

Free plan APILinuxMac+2

AWS Signer covers signing and verification workflows across Lambda, IoT, and container images. API quotas and possible related charges are worth accounting for when planning use.

Visit AWS Signer

Sigstore

Free plan Open source APILinuxMac+3

Sigstore brings artifact signing, identity authentication and a public transparency log into one project. Cosign's stated integration caveats matter for teams considering it inside an application.

Visit Sigstore

The facts

	AWS Signer	Sigstore
Free plan	Yes	Yes
Open source	No	Yes
Runs on	API, Linux, Mac, Web, Windows	API, Linux, Mac, Self-hosted, Web, Windows
Lowest paid plan	Free or on request	Free or on request
Plans published	2	2
Maker	Not published	Not published
Website	aws.amazon.com	sigstore.dev
On code signing software	#2 of 28	#1 of 28

AWS Signer: what it does well

Signs Lambda packages, supported IoT code, and OCI images.
Lambda checks signatures and package integrity at deployment.
IAM policies control access to resources and actions.
Signing profiles are manageable by console, CLI, or API.

What to know first

API actions have per-second quotas by account and Region.
No minimum API request rate is offered.
Related service charges may apply.
Lambda use may incur S3 storage charges.

Sigstore: what it does well

Signs and verifies multiple software artifact types.
Uses temporary keys rather than developer-managed keys.
Records signing events in a public tamper-resistant log.
Provides GitHub Actions and documents GitLab CI.
Free to use for developers and software providers.

What to know first

Cosign has no API stability guarantees.
Cosign does not follow semantic versioning.
Cosign is not recommended for application integration.

Alternatives to AWS Signer Alternatives to Sigstore The whole list