Free tools

Check a site in seconds

Eight quick checks for any public site. No account needed. Each runs once from Cloudflare's edge and says plainly what one check can't tell you.

• Website uptime checkerIs it up? Status, time and every redirect.Open
• API endpoint checkerStatus, JSON and CORS for GET or HEAD.Open
• HTTPS checkerValid certificate, HTTP to HTTPS redirect, HSTS and preload.Open
• Security headers checkerAn A+ to F grade and a fix for each header.Open
• Agent readiness checkerllms.txt, AI crawler rules, agent card and bot blocks.Open
• DNS lookupA, AAAA, CNAME, MX, TXT, NS, CAA and DNSSEC.Open
• Social preview checkerOpen Graph and X/Twitter tags, and whether the image loads.Open
• Domain expiry checkerExpiry date and registrar from RDAP, where the registry publishes it.Open

The checks are made by SupercheckBot. What it does and how to opt out