AI Detection Checker
Perplexity analysis
Measures word choice unpredictability. Humans tend to use more varied, unexpected vocabulary.
Burstiness score
Checks sentence length variation. AI text tends to be uniformly structured.
AI vocabulary detection
Flags overuse of words like "delve", "crucial", "vibrant" that betray AI authorship.
4 detector estimates
Simulated scores for GPTZero, Turnitin, Originality.ai, and Writer.com.
About AI Detection Checker
AI detection works by analyzing statistical properties of text that correlate with machine-generated output: low perplexity (the degree to which each word is highly predictable given prior words), low burstiness (human writing alternates between simple and complex sentences; AI writing stays uniform), and characteristic n-gram frequencies that reflect large language model training distributions.
This checker scores submitted text for the probability it was generated by an AI model. Paste any text, a student submission, freelance article, product description, or blog post, and receive a detection score with highlighted passages that most resemble AI-generated writing. Use it for editorial review before publishing AI-assisted content, or to verify that humanized output is sufficiently differentiated before submitting to platforms that screen for AI content.
How it works
What gets measured
4 detector estimates
GPTZero, Turnitin, Originality.ai, and Writer.com scores all from one paste.
Perplexity analysis
Measures how unpredictable your word choices are. Higher is more human.
Burstiness scoring
Checks sentence length variation. Low burstiness is the top detection signal.
Vocabulary pattern check
Identifies AI words like delve, crucial, pivotal, leverage, and 27 others.
Instant results
No word limits, no signup, no API calls. Analysis runs server-side in under a second.
Free forever
No account required. Check as many texts as you need.