What is CertPost used for?

CertPost is an SSL/TLS certificate monitor that reads the live certificate your server presents and alerts at 30, 14, 7 and 1 day before expiry. It is a good fit for agencies watching client site certificates and teams preparing for shorter certificate lifetimes.

Yes. CertPost has a free plan. Three certificates free forever; unlimited certificates from $29 per month. Checks run daily on free, hourly on Team and every 15 minutes on Agency.

Is CertPost open source?

No. CertPost is proprietary (closed-source) software and can't be self-hosted. In the Monitoring & Observability category, open-source options include Healthchecks, Nezha and Cachet.

What are some alternatives to CertPost?

CertPost competes with UptimeRobot, StatusCake and updown.io.

CertPost: features, pricing and alternatives

About CertPost

CertPost is a monitoring service for SSL/TLS certificates, aimed at teams and agencies that manage many sites. Rather than relying on a renewal record, it reads the certificate that a server actually presents, checking expiry, the full chain and hostname on any TLS port that can be reached.

Warnings go out 30, 14, 7 and finally 1 day ahead of expiry, sent as one message per event to a channel the team already reads. A change history records issuer swaps and fingerprint changes with timestamps. It needs no agent, works with whatever terminates TLS, such as nginx, Caddy, Traefik, Cloudflare, Apache or Kubernetes, and offers a free check that shows whether a certificate is renewed by hand or by automation.

Key features

Live certificate and chain checks
Four warnings before each expiry
Monitoring of any TLS port and host
Issuer and fingerprint change history
Setup without installing an agent
Free check of how a certificate renews

Good fit for

→Agencies watching client site certificates
→Teams preparing for shorter certificate lifetimes

Tags: ssl; tls; certificate-monitoring; expiry-alerts; uptime; devops; security

CertPost: questions and answers

What is CertPost used for?: CertPost is an SSL/TLS certificate monitor that reads the live certificate your server presents and alerts at 30, 14, 7 and 1 day before expiry. It is a good fit for agencies watching client site certificates and teams preparing for shorter certificate lifetimes.
Is CertPost free?: Yes. CertPost has a free plan. Three certificates free forever; unlimited certificates from $29 per month. Checks run daily on free, hourly on Team and every 15 minutes on Agency.
Is CertPost open source?: No. CertPost is proprietary (closed-source) software and can't be self-hosted. In the Monitoring & Observability category, open-source options include Healthchecks, Nezha and Cachet.
What are some alternatives to CertPost?: CertPost competes with UptimeRobot, StatusCake and updown.io.