A page can be well written, accurate, and still fail — because it describes the product in the company's vocabulary rather than the customer's. That gap is easy to feel and hard to prove.
Making it measurable
Extract the unique words from your draft. Extract them from the top three ranking pages for your target query. Compare the two sets. The terms present in theirs and absent from yours are the gap, stated concretely.
Reading the difference honestly
Not every missing word matters. What matters is when the missing terms are the ones customers actually use — the informal name for the product category, the problem phrased the way a person would phrase it, the comparison term they reach for.
What not to do with this
This is a prompt for judgement, not a checklist to satisfy. Stuffing in every absent term produces text that reads like it was assembled to pass an audit, because it was. Add the terms that belong, and only where a sentence is genuinely improved by them.
Try it: Extract Unique Words on SeoWolf's Notepad.