Instead of OpenCA PKI
OpenCA PKI alternatives
OpenCA PKI provides a free, open-source Certification Authority for setting up and managing a PKI. It supports SCEP, HSM integration, and certificate profiles, and runs on Linux, macOS, the web, or self-hosted infrastructure. The project describes its protocols as commonly used and implemented with full-strength cryptography. Operating it involves prerequisites including OpenLDAP, OpenSSL, Apache, Apache mod_ssl, and OpenCA Tools 1.3.0. The documentation page says downloadable documentation is unavailable and that its Guide for version 0.9.2 is outdated in some parts.
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Let's Encrypt
Free plan Open source APILinuxMac+3Automated, free domain-validated HTTPS certificates — Let’s Encrypt automates Domain Validation HTTPS certificates through ACME, while OpenCA PKI provides general PKI management with SCEP and HSM support.
- 2
step-ca
Free plan Open source APILinuxMac+2Automated X.509 and SSH certificate management — step-ca adds SSH certificates, single sign-on issuance, flexible provisioners, and several database backends beyond OpenCA PKI’s stated capabilities.
- 3
EJBCA
Free plan Open source APILinuxMac+3Multiple independent PKIs and enrollment protocols — EJBCA supports multiple separated PKIs in one installation, OCSP and CRL validation, and enrollment through CMP, EST, ACME, and APIs.
- 4
OpenXPKI
Free plan APILinuxSelf-hosted+1Custom certificate workflows and multiple PKI realms — OpenXPKI adds customizable lifecycle workflows, multiple PKI Realms, and YAML configuration managed with revision control.
- 5
XiPKI
Free plan APILinuxMac+1Post-quantum algorithms and broad CA management — XiPKI adds native post-quantum algorithm support, multiple CAs per instance, and an OCSP responder with several status sources.
- 6
Boulder
Free plan APILinuxSelf-hostedDeveloping or experimenting with an ACME certificate authority — Boulder is an ACME authority implementation with separated components, but its maintainers say it often does not fit other organizations’ production use.
- 7
cert-manager
Free plan APILinuxSelf-hostedAutomating certificates for Kubernetes and OpenShift workloads — cert-manager obtains and renews certificates from public or private issuers for Kubernetes and OpenShift workloads rather than serving as a general PKI.
- 8
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
Alternatives may be a better fit if you need automated public HTTPS certificates, SSH certificates, multiple independent PKIs, or certificate management centered on Kubernetes. Others focus on building an ACME certificate authority rather than managing a general PKI. Compare the certificate types and enrollment methods you need, how signing keys are protected, and whether you want to run the authority yourself or manage certificates for workloads. OpenCA PKI is free, so weigh that against each alternative’s distinct capabilities and its operational requirements.
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