Free tools
Free website health tools
Quick checks for the things that quietly take a site down: an expired certificate, a lapsed domain, a closed port, a broken DNS record, or an outage right now. Run one in your browser, no signup.
SSL certificate checkerCheck any site's SSL certificate: when it expires, who issued it, and whether the chain and hostname are valid. No signup, no wait.Open toolDomain expiry checkerCheck when a domain's registration expires, who it is registered with, and which nameservers it uses. Straight from WHOIS.Open toolIs it down checkerCheck whether a website is responding right now. You get the HTTP status code and response time, so you know if it is the site or your connection.Open toolDNS lookup toolResolve a hostname's DNS records: A, AAAA, CNAME, MX, TXT, and NS. See exactly what the internet returns for it right now.Open toolPort checkerTest whether a TCP port is open and reachable on a host, from the public internet. Useful for services like SMTP, SSH, databases, and game servers.Open tool
Run these checks continuously
The free tools are one-off checks. PageWarden runs the same checks around the clock and alerts you when something breaks.
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