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DomainCat
SSL & Domain Expiry Monitoring·domaincat.app
DomainCat monitors SSL certificates (including the origin certificate behind Cloudflare), domain expiry dates, DNS records, WHOIS data, and email security (SPF, DKIM, DMARC, blacklists) for a user's domains. It sends alerts before certificates or domain registrations expire, and provides a dashboard, CSV import, grouping/tagging, and a REST API with Grafana-compatible output.
What it's for
Monitor SSL certificate expiry and validityMonitor the origin SSL certificate behind CloudflareTrack domain registration expiry via WHOISLive DNS record lookups (A, AAAA, MX, CNAME, NS)Check email deliverability configuration (SPF, DKIM, DMARC) and blacklist statusBulk import domains via CSVOrganize domains with groups and tagsAlert clients/domain owners as an MSP managing multiple client domainsFeed domain and certificate data into Grafana dashboards via API
Features 15
- 30/14/7 day expiry alerts
- Automated checks (daily on Free, every 6 hours on Pro, hourly on MSP)
- Blacklist lookups across major RBLs
- CSV bulk import of domains
- Domain Registration Health via WHOIS (registrar, expiry)
- Email Deliverability checks (SPF validation, DKIM detection, DMARC policy)
- Groups and Tags for organizing domains
- HTTP redirect chain and security headers check
- Live DNS Lookup (A, AAAA, MX, CNAME, NS)
- Manual re-check trigger from domain detail panel
- MSP Workflow with separate views for own vs. client domains
- Origin Cert Monitoring behind Cloudflare
- Owner email alerts to notify cert owners directly
- REST API with Grafana-compatible output
- SSL Certificate Monitoring (issuer, expiry, SANs, chain validity)
Pricing
FreeFree
No card required.
5 domains, daily checks
Pro$12/mo
Marked 'Most popular'.
50 domains, checks every 6 hours
MSP$29/mo
Unlimited domains, Hourly checks, Managed-for-others workflow, Owner email alerts, Everything in Pro
Unlimited domains, hourly checks