Free AI content detector.
Estimate text predictability, burstiness variance, and repetition markers. Runs 100% locally in your browser for complete privacy.
Disclosure: This tool performs local heuristic estimation based on vocabulary diversity and sentence length distribution. It does not use any external detection service or API. Your text never leaves your device.
Analyzing text profile...
Evaluating burstiness variance
Analysis Results
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Paste your content on the left and click 'Analyze AI Likelihood' to see a breakdown of detector estimations.
AI Score Estimated
Scan text to see the predicted likelihood of artificial generation.
Detector Estimations
Local heuristic estimates based on text patterns. Does not query external APIs.
Understanding Detection Profiles & Heuristics
AI detectors evaluate statistical regularities in writing. The four signals below describe what each metric measures:
Vocabulary variety
Evaluates lexical predictability. Large language models favor statistically common words and repetitive transition markers. Higher perplexity signals more diverse vocabulary.
Sentence-length variation
Evaluates sentence length consistency. Human writers naturally mix short, punchy sentences with complex clauses (burstiness), whereas automated text tends toward uniform length.
Repeated phrasing
Evaluates repetitive clause structures, formulaic opening phrases, and predictable concluding transitions common across generative models.
Phrase predictability
Estimates the likelihood that individual words follow the default transition pathways typically chosen by standard auto-regressive transformers.
How to interpret your Estimated AI Score
AI scores represent an estimated probability based on language heuristics:
- 70% - 99% (High Predictability): Text features uniform sentence lengths, frequent cliché transitions, and highly predictable word choices. Rewriting to vary rhythm is suggested.
- 30% - 70% (Mixed Indicators): Contains a blend of natural phrasing and machine-like predictability. Common in heavily edited AI drafts.
- 0% - 30% (Natural Rhythm): Exhibits strong variation in sentence length and varied vocabulary choices characteristic of human writing.
Important Limitation
No detector—local or commercial—is 100% reliable. Detection tools frequently produce false positives (flagging human writing) and false negatives. Always use these tools as guides for improving readability, not as definitive proof of authorship.