Diagnostic
See your site the way Google sees it.
Enter your domain. The scan requests your homepage exactly the way a crawler does, one request and no JavaScript, then runs nine checks and reports in plain English. No email required, nothing stored.
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.