How our free tools calculate results

Each checker reports a narrow measurement. Scores and grades are not a full security, deliverability or performance audit.

Methodology

Open the notes for each tool

WHOIS, DNS, email, SSL, speed test and domain appraisal each have a conservative method page.

Registrar, status, nameservers and dates published by the registry or a public WHOIS service for that TLD.

Selected record types (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA) as seen by a few public resolvers at the moment of the query.

Public MX, SPF, a probe of common DKIM selectors, and DMARC TXT records via DNS. The score is a simple completeness check of those lookups.

The certificate presented on port 443: issuer, subject, SAN list, dates, protocol and whether it appears self-signed.

Time to first byte, HTML download time, HTML size and a rough count of referenced resources, measured from our application server.

A transparent heuristic from public signals: length, extension, dictionary/keyword hits, pronounceability, hyphens/digits, and optional WHOIS age.