What this checks — and what it cannot
This is an on-page analyzer: everything it reports comes from the page's own HTML, fetched live when you run it. That covers most of what you control directly — titles, descriptions, headings, alt text, canonicals, link structure. What it honestly cannot see: backlinks pointing at the page, its Google rankings, or its traffic — those live in third-party indexes (that is the paid-API side of SEO, and any free tool claiming otherwise is guessing). Fix order that pays: noindex accidents first, then missing titles/descriptions, then one clear H1, then image alt text.
Frequently Asked Questions
Why did my page fail to load?
The fetcher only allows public http/https pages on standard ports, and blocks private network addresses. Pages that block bots or require login cannot be analyzed.
Is a perfect score required?
No — the checklist flags what matters most. A page can rank well with warnings; it cannot rank at all with a noindex.
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