What the page is declaring.
You want to see whether a topic is clear in the title, H1 and opening copy without chasing a magic density score.
Website & SEO
Check keyword use without chasing a magic percentage.
Measure repetition and placement in the title, H1 and opening text, with a stuffing warning instead of a fake ranking score.
Useful to know
Four things worth knowing.
Where it stops.
Keyword density is not a Google ranking factor and repeating a phrase more often does not make the page better.
What to inspect.
Read the copy like a person: the topic should be obvious without sounding stuffed or mechanically repeated.
Worth knowing.
Use the target phrase where it naturally clarifies the page, then use normal language and related terms.