Measure what a page actually says: length, structure, readability, keyword use, and which common questions it leaves unanswered.
Preview how your page looks in Google search results.
Count words, characters, sentences and reading time.
Measure keyword density and spot over-optimization.
Analyze your H1–H6 structure for hierarchy issues.
Assess readability / reading grade level of your text.
Spot topical gaps against target keywords.
These six tools look at the words on a page rather than the code around it: how long it is, how it is structured, how easy it is to read, how often it repeats a keyword and which common questions it leaves out. You paste your text or HTML and get the result right away, and nothing is sent anywhere.
The Heading Structure Analyzer needs HTML, so paste the page source rather than the visible text. Treat density and reading scores as prompts to reread a passage, not as targets to hit. The Content Gap Finder works from a fixed list of question patterns, not from competitor pages, so use it for ideas, then look at the pages that rank for your topic before you add new sections.