AI Content Detector

This tool uses statistical text analysis to identify patterns characteristic of AI-generated content. It measures six linguistic signals: burstiness (sentence length variation), vocabulary diversity, transition word density, perplexity (word predictability), sentence opener patterns, and readability consistency across paragraphs. Each signal is scored and weighted to produce an overall AI probability estimate.

Statistical detectors like this one are effective at identifying typical AI patterns, but no detector is 100% accurate. Paid services like GPTZero and Originality.ai use trained ML models which can be more nuanced, but they also produce false positives. This tool provides a free, privacy-respecting alternative that runs entirely in your browser — no text is ever sent to a server.

Yes. AI text that has been heavily edited by a human, or generated with specific prompts to vary sentence structure and vocabulary, may score lower. Similarly, highly formulaic human writing (e.g., legal documents, technical manuals) may trigger false positives. No detector is foolproof.

We recommend at least 100 words for meaningful analysis. The tool will attempt analysis with 50+ words but accuracy improves significantly with longer samples. 250+ words provide the most reliable signals across all six metrics.

No. All analysis runs 100% client-side in your browser using JavaScript. Your text never leaves your device. There are no servers, no APIs, no data collection. You can even use this tool offline.

This tool detects statistical patterns common across major AI models including ChatGPT (GPT-3.5/4/4o), Claude, Gemini, LLaMA, and Mistral. Since it measures writing patterns rather than model-specific signatures, it generalizes across AI systems that share similar text generation characteristics.

Resume Mode adjusts thresholds because professional resume language is inherently low-perplexity and low-burstiness — "Managed a team of" and "Developed scalable solutions" are standard professional English, not AI tells. Instead of penalizing uniform structure (all resumes have that), Resume Mode focuses on what actually differentiates AI resumes: buzzword clusters (spearheaded, leveraged, orchestrated), repeated action verbs across bullets, and uniform bullet lengths. No free competitor offers this.

74% of hiring managers say they can detect AI-generated content in applications (Interview Guys, 2025). 33.5% can spot it in under 20 seconds. 62% reject AI-generated resumes without personalization. The biggest tells: overuse of "spearheaded," "leveraged," and "orchestrated," uniform bullet lengths, and generic quantification without context ("increased revenue by 25%" — what product? what market?).