Readability Keyword Density
Score reading ease and check keyword density.
How to use
- 1 Paste or type your text into the box.
- 2 Read the Flesch reading ease score and grade level, with a plain-English label.
- 3 Check words per sentence and syllables per word to find what to simplify.
- 4 Scan the keyword-density table for over- or under-used terms.
About Readability Keyword Density
The Readability Keyword Density tool gives writers, editors and SEO-minded marketers an instant read on how approachable their text is and which terms it leans on.
Paste an article, blog post, email or product description and it computes the classic Flesch Reading Ease score and the Flesch–Kincaid grade level, translating the numbers into a plain-English band such as "Plain English (8th–9th grade)" so you immediately know whether your draft is breezy or heavy going.
Alongside the scores you get the underlying statistics that drive them: total words, sentences, syllables and characters, plus the averages of words per sentence and syllables per word.
Long sentences and dense, polysyllabic words are the two biggest enemies of clarity, and seeing those averages makes it obvious where to tighten.
The keyword-density panel counts how often each meaningful word appears and shows it as a percentage of the total, with common stop words like "the" and "and" filtered out so the list reflects your actual subject matter — useful for spotting both keyword stuffing and missed opportunities.
Automated syllable counting is approximate by nature, so treat the scores as a guide rather than gospel.
Everything is calculated locally in your browser as you type, with no uploads, accounts or tracking, which makes it safe for unpublished or confidential drafts and fully usable offline.
FAQ
How is the reading ease score calculated?
It uses the Flesch Reading Ease formula based on average words per sentence and average syllables per word, then maps the 0–100 result to a difficulty band. The Flesch–Kincaid grade level is shown alongside.
Why are words like "the" missing from the keyword table?
Common stop words are filtered out so the density table reflects meaningful subject-matter terms rather than grammatical filler.
How accurate is the syllable count?
Syllable counting uses a heuristic and is approximate, as all automated counters are. Use the scores as a guide, not an exact measurement.