Diagnostic
See your site the way Google sees it.
Enter your domain. The scan reads your homepage the way a crawler does, one request and no JavaScript, and reports ten checks in plain English. No email. The scan logs the domain and its results, nothing about you.
What this measures and why it matters is written up in plain English in Your website looks finished. Google may see a blank page. The scan reads one page and cannot see everything, so a clean pass here is a good sign, not a guarantee.
Why passing Google and Bing covers DuckDuckGo, Yahoo, and the search behind ChatGPT too: There are two search engines
The comprehensive version: your site, read page by page, reported in writing. The site inspection