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Writing Pattern Indicator

Shows a few objective signals sometimes associated with AI-generated text — sentence-length variation, overused transition phrases, vocabulary repetition. It does not, and cannot, tell you whether something was written by AI.

Please read before using this: No tool — including paid, commercial ones like Turnitin's AI indicator, GPTZero, or Originality.ai — can reliably prove a specific piece of writing was or wasn't AI-generated. All of them, including this one, produce false positives on real human writing (especially from non-native English speakers, technical writers, and people who write very cleanly) and false negatives on edited AI text. Never use this alone to accuse, grade, or discipline someone. Treat it as one small data point at most, and always talk to the person directly if you have concerns.
0Sentence-length variation
0%Vocabulary diversity
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How to read these numbers

Sentence-length variation: human writing tends to mix short and long sentences (high variation); very uniform sentence lengths can — weakly — correlate with AI output, but plenty of skilled human writers are also consistent.

Vocabulary diversity: the percentage of unique words relative to total words. Very low diversity means a lot of repetition, which can happen in both AI and human first-draft writing.

AI-style phrases: a list of transition phrases ("moreover," "in today's fast-paced world," "it's important to note that") that show up disproportionately often in AI writing — but are also just common in formal human writing.

How to use the Writing Pattern Indicator

  1. Paste the text you want to review.
  2. Look at sentence-length variation and vocabulary diversity.
  3. Rewrite any flagged stock phrases to make the writing more natural.

Frequently asked questions

Can this tell whether text was written by AI?

No, and no tool can do that reliably. It shows style patterns that are common in AI drafts, and human writing can show them too.

What should I do with the flagged phrases?

Treat them as editing hints. Replacing stock transitions like “moreover” or “in today’s fast-paced world” usually makes any writing clearer.

Should teachers use this to grade work?

No. False positives are common, especially for non-native English writers. Never use it alone to accuse or discipline anyone.