Keyfactor Platform vs SignServer

Keyfactor Platform, through Keyfactor Command, gives PKI, security, infrastructure, and DevOps teams visibility into certificates and tools to govern their lifecycle. It can inventory certificates from certificate authorities, scan networks for unknown SSL/TLS certificates, and connect to key and certificate stores. Teams can automate enrollment, renewal, revocation, and provisioning, with self-service workflows available through a user interface or API. Listed enrollment protocols are SCEP, ACME, and EST. Administrators can set role-based permissions, protect private keys with retention and storage policies, and require enrollment or approval workflows. Integrations span CI/CD, cloud, HSM, IoT, ITSM, public and private certificate authorities, and web servers. Deployment options are on premises, as a hosted certificate lifecycle service, or as fully managed PKI in a single-tenant cloud platform. Keyfactor says Command has been tested for deployments with more than 500 million certificates. A 30-day trial is offered. Pricing is available on request, and there are no per-certificate fees listed.

SignServer is a server-side platform that centrally manages signing keys and digitally signs code, documents, and timestamps. One installation can serve several signing workflows, including containers, firmware, IoT, and DevOps use cases. It can connect to CI/CD pipelines, firmware build processes, document workflow engines, identity platforms, and other applications through standard interfaces. Community is available as a Docker container, Helm chart, source code, or GitHub release, and is also listed on SourceForge. Its interfaces include SOAP, HTTP, REST, and the SignClient command-line interface, though Community REST lacks some endpoints. Community is released under LGPL V2.1 or later and is intended for learning, testing, and prototyping rather than production. The maker says it lacks production capabilities such as audit, compliance, SLA, high availability, and security features. Enterprise adds professional support with an SLA, security updates, and maintenance. The Community plan is free; the Enterprise Cloud trial is free for 30 days through AWS or Azure marketplaces. The maker recommends Hardware Security Modules for signing-key storage.