Instead of step-ca
step-ca alternatives
step-ca gives DevOps teams a free private CA for automated X.509 and SSH certificates. It covers TLS, mutual TLS, document signing, SSH access, and short-lived SSH user certificates through single sign-on. ACME, OIDC, cloud identity, and JWK provisioners control issuance, while automation handles renewal and passive revocation for clients, servers, and Kubernetes workloads. Templates, multiple database backends, and integrations with KMS, HSM, TPM, and YubiKey PIV support tailored deployments across Linux, macOS, Windows, APIs, and self-hosted environments.
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Let's Encrypt
Free plan Open source APILinuxMac+3Free automated public HTTPS certificates — Let's Encrypt focuses on domain-validated SSL/TLS certificates through ACME, rather than step-ca's private X.509 and SSH CA.
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OpenCA PKI
Free plan Open source LinuxMacSelf-hosted+2Traditional open-source PKI deployments — OpenCA PKI provides an out-of-the-box CA with OpenLDAP, OpenSSL, Apache, and Apache mod_ssl dependencies.
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EJBCA
Free plan Open source APILinuxMac+3Multiple independent PKIs and validation — EJBCA supports multiple separated PKIs plus CA, RA, and VA modules with OCSP and CRL validation.
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OpenXPKI
Free plan APILinuxSelf-hosted+1Custom workflows across multiple PKI realms — OpenXPKI hosts multiple PKI Realms with distinct namespaces, profiles, workflows, and policies in one instance.
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XiPKI
Free plan APILinuxMac+1Post-quantum and clustered CA infrastructure — XiPKI adds native post-quantum algorithms, multiple CAs, clustered active instances, and extensive HSM device support.
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Boulder
Free plan APILinuxSelf-hostedRunning a Let's Encrypt-style ACME CA — Boulder is the componentized ACME software behind Let's Encrypt, built around Web PKI requirements rather than general private CA use.
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cert-manager
Free plan APILinuxSelf-hostedKubernetes and OpenShift certificate automation — cert-manager runs inside Kubernetes and OpenShift to obtain, renew, and distribute certificates from public or private issuers.
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Dogtag Certificate System
Free plan APILinuxSelf-hosted - 9
AppViewX PKIaaS
Free trial APISelf-hostedWeb - 10
HashiCorp Vault
Free plan LinuxMacWindows - 11
AWS Private Certificate Authority
Free trial APIWeb - 12
EZCA
Free trial AndroidAPIiPhone+5 - 13
KeyTalk CKMS
Free trial AndroidAPIiPhone+5 - 14
Google Cloud Secret Manager
Free plan Web - 15
Keyfactor Platform
Free trial APISelf-hostedWeb - 16
DigiCert Private CA
Paid APILinuxSelf-hosted+1 - 17
Entrust Certificate Manager
Paid AndroidAPIiPhone+3 - 18
SSL.com Private Enterprise PKI
Free plan Web - 19
Microsoft Cloud PKI
Paid AndroidiPhoneMac+1 - 20
CFSSL
Paid LinuxMacWindows - 21
Microsoft Active Directory
Paid Windows - 22
GlobalSign Managed PKI
Paid Web - 23
SecureW2 Managed PKI
Paid AndroidiPhoneLinux+3 - 24
Sectigo Private PKI
Paid Web
Readers may switch when step-ca’s boundaries matter. It uses one configured intermediate CA, offers limited active revocation and legacy-protocol or device-attestation choices, and lacks certificate history, metrics, dynamic SCEP, and ACME External Account Binding. Its free plan also excludes Certificate Transparency integration. Compare alternatives by CA structure, certificate validation, enrollment protocols, lifecycle automation, key protection, and deployment model. Some options focus on public HTTPS, some support multiple independent PKIs, and others specialize in Kubernetes workloads or production ACME infrastructure.
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