Wrote it yourself? Used AI responsibly? You shouldn't be flagged. Our proprietary AI detection model can identify paraphrased text, AI rewrites, and mixed human–AI writing, so you get reliable, highly accurate results.
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Our AI Detector is built on a custom model architecture designed to detect text generated by ChatGPT, Gemini, Claude, and other AI platforms.
The AI Detector analyzes text at the
sentence level rather than document-wide, offering granular detection that identifies specific AI-generated sections within mixed content.
Training datasets include diverse sources, such as openly licensed content, academic writing, publicly available text, AI-generated writing, and paraphrased text, for enhanced robustness in detection.
Our tool offers advanced detection of paraphrased and rewritten AI content through specialized training on text transformations that evade simpler algorithms.
AI content is categorized across 10
specific patterns, including overly formal tone, technical jargon, predictable structure, and generic language.
Our classification system can determine whether a piece of text is human-written or AI-generated (binary classification) and can also identify specific AI usage patterns and mixed content types (four-way classification).
What our users are saying
Every hour, more than 2,000 students join the QuillBot platform!
It was able to catch most of the AI-generated content we threw at it. There were a few times it got tricked, but it was mostly on target.
Fahim J.
QuillBot's AI Detector is incredibly accurate and fast, making it easy to distinguish between human and AI-
generated content. It's a must-have tool for writers who value content authenticity. Highly reliable and user-friendly!
Sanya A.
QuillBot did surprisingly well and might be my favorite of the AI-detection tools I sampled because of the intuitive interface and detailed report. far more accurate than Grammarly's tool.
Ashley B.
How our model finds AI generated text
See how our model processes your text through multiple validation layers:
Text input
Submit your document or text for analysis
Deep processing
The model performs intelligent chunking and optimization for analysis
Dual analysis
Multiple validation layers ensure accuracy
Detection score
AI Generator presents detailed confidence scores with explanations
How our model processes your text
We look at word patterns, sentence variety, and probability to assess authorship.
Probabilistic scoring
Our advanced model provides confidence scores rather than binary yes/no answers. This gives you nuanced insights into the likelihood of AI involvement.
Confidence categories: "low," "moderate," and "high"
Mixed classifications
Our model includes classification of “mixed” human and AI content. AI Detector outputs 4 possible classifications instead of simple binary results.
Revolutionary approach: recognizes the reality of AI-assisted writing in modern workflows
Designed to inform, not punish
Our AI Detector prioritizes student protection with transparent, understandable results.
Today’s writing is rarely 100% human or AI. Our detector understands this and judges fairly.
Safe to use with tools like a grammar checker or a paraphraser.
AI Detector’s output includes probability scores and phrase-level explanations, letting students and educators see exactly why text was flagged.
Clear reasoning builds trust and supports learning
Our AI Detector flags text that may be AI-generated. Use your best judgment when reviewing results.
Never rely on AI detection alone for decisions impacting someone's career or academic standing.
Powered by a proprietary model
Our proprietary model includes a deberta-v3-large dual encoder, multiple validation layers, and multiple classifiers to minimize false
positives and improve accuracy.
Multi-language support
High accuracy across 20+ languages thanks to specialized models.
Large data set
The dataset behind AI Detector includes a wide range of sources, including academic writing, openly licensed documents, and public domain texts.
Safe to use with other tools
Many writers use AI on a limited basis to assist with writing (e.g., grammar checkers or paraphrasers). Our nuanced detector won’t
overreact and label an entire text as being AI-generated.
Phrase-level analysis
Highlights specific sections and explains detection reasoning.
Trained on paraphrased AI text
Detects subtle rewrites and paraphrasing that other tools miss.
Try our free AI Detector
Check your text with advanced AI detection technology. Get actionable results you
can count on.
Upload your text and get comprehensive AI detection results in seconds.