AI Detector
See how AI-flavored any text reads, with a score and flagged phrases.
Your result will appear here.
Tip: press ⌘+Enter to run.
An AI detector estimates the probability that text was generated by an AI model, scoring signals like perplexity, burstiness, and AI-tell vocabulary to return a 0–100 AI score and verdict.
How to use the ai detector
- 1 Paste your text. Add the passage you want to check.
- 2 Click Detect AI. Humanit analyzes it across 10 linguistic signals.
- 3 Read the score. Get an AI-probability score, verdict, and flagged phrases.
- 4 Fix if needed. Send it to the humanizer to make it read more human.
What is an AI detector?
An AI detector analyzes writing for the statistical fingerprints language models leave behind and estimates how likely it is the text was AI-generated. Humanit returns an overall 0–100 AI score, a plain-English verdict (Human → Likely AI), the specific phrases that look machine-written, and a breakdown across ten signals so you understand why.
How AI detection works
The two strongest signals are perplexity (how predictable the word choices are) and burstiness (how much sentence length varies). AI tends to write low-perplexity, low-burstiness prose. Humanit also weighs AI-tell vocabulary, discourse markers, punctuation density, structural patterns, personal voice, concrete detail, and tonal consistency — the same factors GPTZero and Originality.ai evaluate.
How accurate are AI detectors?
No detector is perfect — short passages, edited AI text, and non-native human writing can all blur the signal, so treat any score as a strong estimate rather than proof. Humanit gives you the per-signal breakdown precisely so you can judge the result yourself instead of trusting a single number.
| Output | What it tells you |
|---|---|
| AI score (0–100) | Overall likelihood the text is AI-generated |
| Verdict | Human, Likely Human, Uncertain, Likely AI, or AI |
| Flagged phrases | The exact spans that read as machine-written |
| 10 sub-scores | Perplexity, burstiness, AI vocabulary, and more |
Frequently asked questions
How does the AI detector work?
It scores your text across ten signals — perplexity, burstiness, AI vocabulary, discourse markers, punctuation, structure, personal voice, concrete detail, imperfection signals, and tonal consistency — then returns a 0–100 AI-probability score and verdict.
Is the AI detector free?
Yes. You get free checks every day with no account required to try it.
Can it detect ChatGPT and Gemini text?
Yes. The detector looks for general AI writing patterns, so it works on output from ChatGPT, Gemini, Claude, and other models — not just one.
Are AI detectors always right?
No. Detection is probabilistic. Edited AI text, very short passages, and some human writing can produce uncertain scores, so use the result as guidance, not proof.
What score counts as AI?
Higher means more likely AI. Humanit pairs the number with a verdict label and flagged phrases so you can see the reasoning behind the score.
What if my text scores as AI?
Send it to the Humanit AI humanizer to rewrite it in a more human style, then re-check it here.
Last updated: May 2026