DomainCat — SSL & Domain Expiry Monitoring

Domain & SSL Health Monitoring

NOTHING.

EXPIRES.

UNNOTICED.

DomainCat watches your domains and SSL certs so you don't have to. WHOIS expiry, DNS health, SPF, DMARC, blacklists — all in one dashboard.

Try the free checker →

5domains free

2clocks — cert + domain

30/14/7day alerts

domaincat.app — All Domains

DomainSSL ExpiryDomain ExpStatus

domaincat.app89d312d

Healthy

api.startup.io14d202d

Warning

legacyapp.comEXPIRED104d

Expired

dev.shopco.io6d153d

Critical

740ft.com245d338d

Healthy

Never get caught by an expired cert or a domain that silently lapsed

What's covered

Domain health is more than just SSL.

Certs are one clock. Your domain registration is another. Then there's DNS, email deliverability, blacklists, and security headers. DomainCat watches all of it.

SSL

SSL Certificate Monitoring

Issuer, expiry, SANs, chain validity. Auto-detects renewal. Checked every 6 hours on Pro.

Domain

Domain Registration Health

WHOIS lookup, registrar info, and domain expiry tracked separately from your cert. Two clocks, both visible.

DNS

Live DNS Lookup

A, AAAA, MX, CNAME, NS records on demand. HTTP redirect chain and security headers included.

Email Deliverability

SPF validation, DKIM detection, DMARC policy, and blacklist lookups across major RBLs.

MSP

MSP Workflow

Separate views for your domains vs. client domains. Alert the cert owner directly when it's not yours to renew.

API

Grafana API

REST API with Grafana-compatible output. Feed domain and cert data into your existing dashboards.

Simple pricing

No surprises. Just like your domains.

Free

5 domains, daily checks. No card required.

$0/mo

✓5 domains
✓Daily SSL + domain checks
✓Email alerts
✓Basic domain detail

Pro

50 domains, 6-hour checks, full tools.

$12/mo

✓50 domains
✓Every 6 hours
✓Full DNS, WHOIS, SPF, DMARC
✓Blacklist checks
✓API + Grafana output

MSP

Unlimited domains, hourly checks, owner alerts.

$29/mo

✓Unlimited domains
✓Hourly checks
✓Managed-for-others workflow
✓Owner email alerts
✓Everything in Pro

Start watching in minutes.

Free plan. No card. Add your first domain and see exactly what DomainCat finds.

Try check.domaincat.app →