cert-manager vs Certify The Web

cert-manager is a free, open-source tool for obtaining and managing X.509 certificates on Kubernetes and OpenShift. It requests certificates from public or private issuers, keeps them valid, and attempts renewal before expiration. The project automates TLS certificate issuance for Kubernetes Ingress and supports private-PKI certificates for pod-to-pod mutual TLS. Documented authority options include Let’s Encrypt, HashiCorp Vault, CyberArk Certificate Manager, and private PKI. Installation can use kubectl-applied manifests, Helm, Flux, or Argo CD. Related projects include istio-csr, approver-policy, Kubernetes CSI drivers, csi-driver-spiffe, and trust-manager; trust-manager distributes X.509 trust bundles and can run independently. cert-manager publishes threat-model and hardening guidance covering secrets, RBAC, networking, and Kubernetes configuration. Its default Helm values prioritize installation ease and backward compatibility over hardened production security. The project has no LTS releases, though each release is supported until the second subsequent version.

Certify The Web provides products for requesting, deploying, and renewing TLS certificates. Certificate Manager is intended for Windows servers or desktops, Management Agent for headless Linux and macOS systems, and Management Hub for central administration of multiple instances. The tools support ACME authorities including Let's Encrypt, Google Trust Services, ZeroSSL, Actalis, and private or enterprise CAs. Domain checks can use HTTP or DNS, with options ranging from built-in providers and Certify DNS to manual TXT records or custom scripts. Deployment tasks cover IIS, Apache, nginx, Tomcat, Exchange, ADFS, RDP, Azure App Service, Azure Key Vault, HashiCorp Vault, and IIS Centralized Certificate Store. Other deployments can use scripts, webhooks, SSH/SFTP, or UNC shares. Hub offers a web interface, API, role-based access, managed DNS challenges, and certificate monitoring across instances. A free evaluation has no feature limits or time limit. Cloud-managed licensing starts at $4.99 a month per install; other plans have annual or longer billing terms. Licenses do not bypass certificate authority rate limits.