What is a website checker?
A website checker runs repeatable tests against a public URL. Depending on the tool, it may inspect response codes, page titles, headings, canonical tags, robots directives, structured data, links, mobile layout, loading performance and basic trust signals.
The useful output is evidence you can verify: the exact URL, failed test and next action. A single overall score is a summary, not a diagnosis, because a minor metadata warning and a blocked enquiry page should never carry the same business priority.