Never let your SSL certificate expire again
SignalDocks checks your TLS certificate daily and alerts you well before expiry — so you never serve a broken padlock to your users.
Free plan available · No credit card required
Daily expiry checks
Runs once per day automatically. No quota deducted from your monitor count — SSL checks are free on all plans.
Multi-threshold alerts
Get notified at 30, 14, 7, and 1 day before expiry so you have plenty of time to renew without rushing.
Certificate validity check
Beyond expiry, SignalDocks detects invalid certificates, mismatched hostnames, and self-signed certs in production.
How it works
Up and running in minutes
Add your domain
Enter the hostname (e.g. yourdomain.com). SignalDocks automatically checks port 443.
Daily check runs
Every day, we connect to your server, fetch the certificate, and record the expiry date.
Alert before it's too late
You receive an alert at 30, 14, 7, and 1 day before expiry — with enough time to renew.
Everything included
No hidden limits
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Other monitor types
Start monitoring in under 2 minutes
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