Free Monitoring Tools
Quick, free utilities to diagnose your website. No sign-up required.
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SSL Certificate Checker
Check SSL certificate validity, expiry date, issuer, and certificate chain for any domain.
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DNS Lookup
Look up DNS records (A, AAAA, CNAME, MX, TXT, NS) from multiple global server locations.
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Markdown for Agents Checker
Test whether your website serves Markdown via HTTP content negotiation — essential for AI agent readiness.
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HTTP Response Inspector
Send an HTTP request with any custom headers and inspect the full response — status code, all response headers, and a body preview.
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SLA Uptime Calculator
Convert any uptime percentage into allowed downtime per period, or check if an outage duration exceeded your SLA target.
Start monitoring your website content and uptime with Testomato
You can try it all free for 14 days with no credit card and no commitment.