Free tools
Find out what is actually going on with a website
Each of these runs a real check and tells you plainly what was measured, what was inferred from a signature, and what could not be determined at all.
Who Hosts This Site?
Find the host, CDN, DNS and mail provider
Website Health Check
Security, SEO basics, hosting response
Website Speed Test
Core Web Vitals in plain English
DNS Lookup
A, AAAA, CNAME, MX, TXT and NS records
SSL Checker
Issuer, expiry and what it covers
Technology Checker
What a site is actually built with
A note on what these tools will not do
They only accept public domain names. Private addresses, internal hostnames and IP literals are rejected, and every redirect is re-checked before it is followed — the tools cannot be pointed at anything on our own network. Results for a given domain are cached briefly so repeated checks do not hammer somebody else's server.
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