How AI Detection Works
Write Magicly's detector analyzes statistical patterns in text — perplexity (how predictable each word choice is) and burstiness (variation in sentence length and rhythm). AI models like GPT-4, Claude, and Gemini produce low-perplexity, low-burstiness text that stands out from human writing. Each sentence is scored individually so you can pinpoint exactly which sections triggered the flag.
Who Uses the AI Detector?
Teachers & Educators
Review student submissions for AI-generated content. Get a sentence-level breakdown that highlights the specific sections most likely written by AI.
Students
Check your own work before submitting. If sections score above 17%, use the built-in humanizer link to fix them without starting over.
Editors & Publishers
Screen freelance content for AI use before publication. The probability score gives you a clear signal to act on, not just a binary pass/fail.
HR & Recruiters
Verify that cover letters and written tests are genuinely authored. Detect AI patterns in applications that look polished but feel impersonal.
Understanding Your Score
A score below 17% indicates likely human-written content. 17–35% is a mixed or uncertain signal — some AI assistance may be present. Above 35% is a strong indicator of AI-generated text. No detector is infallible; always use the score as one signal in your review process, not as a definitive verdict.
Detector FAQs
Everything you need to know about AI content detection.
- How accurate is the AI Detector for checking essays?
- Our detector analyses sentence-level patterns, perplexity, and burstiness to identify AI-generated content. It works across GPT-4, Claude, Gemini, and other popular models, returning a probability score with every result. No detector is perfect — treat the score as a reliable signal to guide your review before submitting.
- What AI detection score is safe to submit?
- A score below 17% is considered likely human-written and is generally safe. 17–35% is a mixed signal where AI assistance may be flagged. Above 35% is a strong indicator of AI-generated text. If your score is above 17%, use the built-in humanizer link to lower it before submitting.
- Is this similar to what universities and teachers use?
- Our detector uses the same underlying signal analysis — perplexity and burstiness — that institutional tools rely on. While we are independent software, checking your text here gives you a strong indication of how it may score under academic review. Use it as a pre-submission check.
- Which AI models can it detect?
- The detector is trained to identify output from GPT-3.5, GPT-4, Claude, Gemini, Llama, Mistral, and other popular models. It updates regularly as new models are released to keep detection rates high.
- What is the word limit for AI detection?
- Free accounts can scan up to 100 words per request. Pro accounts raise the limit to 2,000 words, which is ideal for longer essays, reports, or articles. More text generally produces a more reliable score.
- Can I humanize flagged text directly from the detector?
- Yes. If your text scores above 17% AI probability, a "Humanize This Text" button appears in the results panel. One click sends it straight to the humanizer — no copy-pasting needed.