Know what's
behind any website.
Audit any public website in one click — DNS, SSL, headers, tech stack, redirects, and more.
TLS, headers, cookies, WAF signals
Records, nameservers, DNSSEC, WHOIS
Redirects, robots, sitemap, uptime
Frameworks, servers, analytics, email
Frequently asked
What is Harpd SiteCheck?
Harpd SiteCheck is a free online tool that audits any public website’s security, DNS, email authentication, and technology footprint in a single click. It runs 30+ passive intelligence checks and returns a plain-language report with a 0–100 score.
Is Harpd SiteCheck free?
Yes. Harpd SiteCheck is free to use and requires no signup. Scans are transient, and no permanent history of your scans is stored by default.
What does a SiteCheck report include?
Each report covers five categories: Security (TLS, headers, cookies, WAF), DNS and domain (records, nameservers, DNSSEC, WHOIS), Email (MX, SPF, DKIM, DMARC), Website surface (redirects, robots, sitemap, uptime), and Technology (frameworks, servers, hosting, analytics).
Can I scan a private or internal website?
No. SiteCheck only scans public http/https targets. Loopback, private, link-local, metadata, multicast, and reserved IPv4 and IPv6 ranges are rejected before any connection is made.
Does Harpd SiteCheck store my data?
No permanent scan history is stored by default. You can export a local JSON copy of any report if you want to keep it.