AI Detector for Teachers

Free AI detector for teachers and educators. Check student essays, assignments, and papers for ChatGPT, Claude, and Gemini writing patterns. No login, no account, no limits.

Academic AI DetectionFree Forever75–90% on EssaysNo Account Needed

AI Text Detector

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Analyzing…

Narrative Academic
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Signal Breakdown tap to expand

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Accuracy note: Browser-based detectors achieve ~70–80% accuracy. Use as a screening tool, not sole evidence of AI use. How it works →

Why Academic AI Is Easiest to Detect

Student essays are the best-case scenario for AI detection. Academic writing is exactly the style ChatGPT defaults to — and the signals are clearest in formal essay format.

Vocabulary Density

Academic AI essays are saturated with Kobak vocabulary markers: "delve", "meticulous", "nuanced", "comprehensive", "underscore". These spiked 3–28× in academic writing after ChatGPT launched in November 2022.

Transition Addiction

Student AI essays use "Furthermore", "Moreover", "Additionally", "In conclusion" at rates 4–6× higher than genuine student writing. This is the single most reliable signal in academic AI detection.

Perfect Structure

AI essays always have: introduction, 3 body paragraphs of similar length, conclusion. Real student essays are messier — they trail off, over-develop one point, skip another. Perfect structure is a flag.

Closing Ritual

"In conclusion, this essay has demonstrated..." followed by a bullet-point summary of everything just said. Human students don't write this — they end with their last point. AI always wraps up formally.

Important: Academic Integrity Policy

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Do not use AI detection as sole evidence of misconduct.
  • False positive rate: ~5–15% on human text. Some students write in formal styles that can trigger signals.
  • Use detection as a starting point for a conversation, not a disciplinary finding.
  • Ask the student to explain their process — that conversation is more revealing than any score.
  • Multiple signals firing together (vocabulary + transitions + closing ritual) is more significant than a single signal.

Teacher Workflow: Screening Essays

  1. Paste the full essay text into the detector above
  2. Read the score and the signal breakdown — not just the number
  3. If score is 70%+: look for which signals fired. Vocabulary + transitions together = strong indicator
  4. If score is 50–70%: could be edited AI or a student who writes formally. Check their previous writing style
  5. If score is under 40%: likely human — but check transition density signal specifically
  6. For any elevated score: have a conversation. Ask the student to walk through their writing process

Teacher FAQ

No. AI detection tools — including paid ones like Turnitin — should not be used as sole evidence. False positives occur. Use detection as a starting point for a conversation about the student's writing process.
Yes. Academic AI writing triggers vocabulary spike, transition addiction, and closing ritual signals most strongly. Academic essays are where AI detection is most reliable — 75–90% on unedited ChatGPT essays.
Edited AI output scores 40–60% vs 75–90% for clean AI. A lower-but-elevated score still warrants a conversation. Check the signal breakdown — vocabulary and transition signals firing together is meaningful even at 45–55%.
Yes, completely free. No account, no login, no API key, no word limits. Run as many essays as you need — all detection runs in your browser.