Scan your writing before GPTZero does
See per-sentence detection risk before GPTZero flags your text. Fix false positives and verify your edits lower your score.
About GPTZero's AI Detection
GPTZero measures perplexity and burstiness to classify text as human or AI-generated. Low perplexity and uniform sentence structures are the primary signals it uses to flag content.
GPTypo uses the same detection signals to show you exactly which sentences are flagged, letting you edit and re-verify until your text passes.
What GPTZero looks for
These are the types of signals that GPTZero's classifier measures. GPTypo checks for the same patterns.
Sentence uniformity
AI text tends to produce sentences of similar length and rhythm. High variance is a signal of human writing.
Low perplexity
Predictable word choices with few surprises. Human writers are messier and less statistically smooth.
AI vocabulary
Overuse of phrases like "furthermore," "it is important to note," and "multifaceted" that appear far more often in AI output.
Structural repetition
Repeated paragraph openers, parallel sentence structures, and formulaic transitions between ideas.
Missing texture
Human writing has contractions, hedging, asides, and first-person markers. AI text tends to be uniformly polished.
Document coherence
AI text often has a narrow vocabulary range and smooth sentence-to-sentence flow that reads as artificially consistent.