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Free Website Monitoring Tools

Run instant checks for SSL certificates, DNS blacklists, email authentication (DKIM / SPF / DMARC) and website uptime – no login, no credit card, just results.

Rate limit: 10 requests per hour per IP address to keep the tools fast, fair and abuse‑free.

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🔒
Free SSL Certificate Checker

See issuer, expiry and full certificate chain details for any HTTPS domain.

Check SSL
📧
DNSBL Blacklist Checker

Check if your sending IP or domain appears on major DNSBL spam blacklists.

Check DNSBL
✉️
DKIM / SPF / DMARC

Validate DKIM, SPF and DMARC DNS records to avoid spam folders and hard bounces.

Check Email DNS
⚡
Website Uptime Test

Test your site from multiple regions and see response times and HTTP status codes.

Check Uptime

Need more than one-off checks?

Create a free account to schedule automatic checks, publish status pages and get alerts when something breaks.

Create Free Account
Shareable results: every tool generates a permalink you can share with clients or teammates.
How It Works

Free tools above + automated monitoring for every plan

Set up a monitor once, and we'll run these checks for you automatically - no cron jobs or scripts required.

SSL Monitoring

We check your certificate chain every 6 hours and alert you 30, 14, 7 and 1 day before expiry.

  • Certificate chain validation
  • Expiry countdown alerts
  • TLS handshake verification
Blacklist Monitoring

We query multiple major DNSBL servers every 6 hours. If you appear on a blacklist, you'll get an email immediately.

  • Checks across major spam blacklist providers
  • Alerts only on status change
  • Delisting guidance in email
Email Auth Monitoring

We verify your DKIM, SPF & DMARC DNS records every 6 hours so you never silently break email delivery.

  • SPF record validation
  • DKIM selector checks
  • DMARC policy monitoring
All tool monitors are included in every plan - even the Free tier.

No hidden upsells. SSL, DNSBL, and email auth checks run automatically every 6 hours for all users.

Compare Plans Create Free Account