// GUIDE
How to continuously monitor SSL certificates
One-off checks miss renewals and silent failures. Continuous monitoring means re-probing every domain on a schedule and reacting to change.
Run scheduled checks (hourly is plenty) against every monitored hostname and compare against the last known certificate fingerprint.
Detect changes: a new issuer, a shortened validity window, or an unexpected certificate appearing in CT logs.
Page the right channel automatically and keep a history so you can audit what changed and when.
CertFleet runs this loop for you on Cloudflare Workers — no infrastructure to maintain.
▸ START MONITORING
CertFleet probes the live certificate, watches Certificate Transparency, and alerts you 30/14/7/1 days before expiry. Free for 5 certificates, no card.