AI Content Detector
Check whether your essay, report or paper reads as AI-written. Our multi-model detector looks for the writing patterns of ChatGPT, Claude and Gemini and gives you a probability score with a risk level.
Source Text
Analysis Report
Paste text and run analysis to see deep insights and machine-generation probabilities here.
Institutional Grade Intelligence
Our multi-step engine breaks down text into semantic chunks and analyzes them against known patterns of LLMs like GPT-4, Claude 3, and Gemini. Get precise certainty levels that align with university and professional standards for AI detection.
User Feedback
"The most reliable detector I've tested. It actually distinguishes between AI-assisted and AI-generated content."
"Crucial for my workflow. I use it to verify my final drafts before sending them to clients."
How our AI Content Detector Works
Our AI Content Detector uses a multi-layered approach to identify machine-generated text. By analyzing the "perplexity" (randomness of word choice) and "burstiness" (variation in sentence length), we can determine if a piece of content was written by a human or a Large Language Model (LLM) like GPT-4, Claude, or Gemini.
Unlike basic detectors, StudyHobby scans for structural fingerprints that are unique to specific AI versions. This allows us to provide a granular risk assessment, helping you verify the authenticity of essays, articles, and research papers with institutional-grade confidence.
Frequently Asked Questions
How does the GPT-4 detector work?
Our engine analyzes sentence variety (burstiness) and predictability (perplexity). AI typically writes with very consistent, low-perplexity patterns which we flag with high precision.
How accurate is the AI detection score?
The score is a probability, not a verdict. It is most reliable on long-form text of roughly 250 words or more, because a short snippet does not contain enough linguistic signal to judge. No detector can be certain, so treat a high score as a reason to look more closely rather than as proof.
Can it detect GPT-4 and Gemini content?
Yes. Our models are specifically trained on the outputs of GPT-4, Claude 3.5, Gemini Pro, and even DeepSeek. We constantly update our training sets as new AI models are released to ensure you stay protected against the latest generation of machine-written text.
What should I do if my human text is flagged?
False positives can occasionally occur, especially if your writing style is very structured, academic, or formal. If your human-written text is flagged as AI, we suggest using our AI Text Refiner to add more natural variance and flow to the prose.
Is this detector free to use?
We offer a generous free tier for daily scans. For bulk institutional checks or advanced multi-model analysis, check our pricing page.