Unique Word Counter

Unique word count against total word count gives you a repetition ratio, and that ratio is a better diagnostic than either number alone. Ordinary English prose reuses a lot of words — articles, prepositions, and auxiliaries make up a large share of any text — so a low unique ratio is normal. What is informative is a sudden drop between drafts, which usually means a section has started circling the same few terms.

The metric is length-sensitive in a way that trips people up. Unique word count rises steeply at first and then flattens, because a 200-word passage will introduce most of its distinct vocabulary early while a 2,000-word article keeps reusing the same core terms. That means comparing the raw unique count of a short page against a long one tells you almost nothing. Compare passages of similar length, or use the lexical diversity calculator, which normalises for exactly this.

Higher variety is not automatically better, and in technical writing it is often worse. Documentation should call the same thing by the same name every single time; reaching for synonyms to avoid repetition is how a reader ends up wondering whether an endpoint and a route are two different concepts. Use the count to find genuinely lazy repetition in persuasive or narrative writing, and largely ignore it for reference material where consistent terminology is the whole point.