Introduction!

CertSonar monitors your SSL certificates, domain registrations, and DNS records around the clock. Get email, push, webhook, or Slack alerts 30, 14, and 7 days before anything expires, so your clients never see a browser warning or an offline site.

Who it's for: Freelance developers and small agencies managing 3–60 client websites.

The problem: An expired SSL certificate shows a full-page browser warning. An expired domain gets grabbed by squatters. A DNS change can silently redirect visitors to phishing pages. You find out when a client calls you angry.

The solution: Add your domains, we check SSL, WHOIS, and DNS every 2–6 hours. You get alerts before anything breaks.

Key features:

• SSL monitoring → expiry, issuer, TLS version, wildcard detection

• Domain expiry → RDAP + WHOIS fallback, registrar info, lock status

• DNS health → A, MX, SPF, DMARC records, unauthorized change detection

• Smart alerts → email, browser push, webhooks, Slack (Agency)

• Weekly/daily health reports

• Free SEO tools → no signup required (SSL checker, DNS lookup, domain expiry)

Pricing: Free tier (1 domain). Launch offer: €19/year Personal (15 domains) and €49/year Agency (60 domains) → prices go up to €29 and €69 after 6 months. Early subscribers keep their launch price forever. No credit card for free tier.

Built with: Vue 3, .NET 10, Firestore, Cloud Run, Firebase Auth (Google sign-in).