Step-ca is a self-hosted open-source CA that supports ACME

In plain words

Step-ca is an open-source certificate authority designed for self-hosting that supports the ACME protocol. It is built for developers and system administrators who need to issue and manage digital certificates within their own infrastructure. The software enables organizations to run their own CA without relying on external services, making it suitable for internal PKI deployments, development environments, and scenarios requiring certificate automation through ACME-compatible clients.

written from the facts on this page · September 2026

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