Heatmap
Each sentence colored by AI likelihood. Red = almost certainly model. Green = strong human signal.
AI Essay Detector · Academic-grade
The AI essay detector faculty actually trust.
Paste any essay up to 3,000 characters. Get sentence-level AI evidence you can show a student, not just a number.
- 0.94 AUC on held-out academic corpus.
- PDF reports for integrity hearings.
- Canvas, Blackboard, Moodle, D2L native.
Why essays need a specialized detector.
General-purpose AI detectors are trained on Reddit posts, news articles, and product reviews. They're tuned for any generated text, which means they under-weight the signals that matter most in academic writing, formulaic openings, flat topic-sentence patterns, statistically rare but human-characteristic discourse markers like "to be fair" or "that said".
aiessaydetector.ai is trained exclusively on essays. Personal statements, literature responses, history theses, application essays, research summaries. The classifier has seen how a Year 11 student argues about The Great Gatsby versus how GPT-4o argues about The Great Gatsby. That register-specific training is why our academic AUC is higher than general detectors by 4-8 points.
What the report shows a teacher.
Per-sentence score
Perplexity, burstiness, and classifier confidence for every sentence, exportable to CSV.
Hybrid-draft ratio
Estimates how much of the essay was human-edited vs model-native, helps distinguish 'cheated' from 'AI-assisted'.
Model fingerprint
If the text matches a specific model family (GPT-4o, Claude 4, Gemini 2.5), we'll tell you which.
PDF export
Cryptographically signed report for academic-integrity panels. Tamper-evident.
Student-facing version
An optional 'for student' view that explains the score in plain language, useful for conversations, not confrontations.
By the numbers
Trusted by faculty across 1,800+ institutions.
0.94
Academic AUC
Held-out essay corpus, audited Q1 2026.
3.2M
Essays scanned
Across U.S., UK, and Commonwealth schools.
22
Languages
Highest accuracy in English, Spanish, French.
<3%
ESL false-positive
Fairness-tested on non-native writers.
Frequently asked questions
What counts as an 'AI-written essay'?
Any essay where a language model produced more than roughly 30% of the final prose, including hybrid drafts where a student asked GPT-4o for 'an opening paragraph' and edited from there. We score the full spectrum: human, AI-assisted, AI-drafted-then-edited, and purely model-native.
What essay types do you detect best?
Personal statements, literature papers, history essays, social-science analyses, and college application essays. Our training corpus includes 2M student submissions across U.S., UK, and Commonwealth academic registers. Less confident on technical lab reports and code-heavy writing.
How long does an essay need to be?
We require at least 20 words for any score, and 80+ words for a high-confidence score. Under 80 words the signal-to-noise ratio is too low for us to publish a reliable verdict.
Does it work on essays in other languages?
Yes, for 22 languages. Accuracy is highest in English (AUC 0.94), Spanish (0.91), French (0.90), German (0.89). Non-Latin scripts (Chinese, Japanese, Korean, Arabic) are supported but with lower AUC (~0.82).
Can I get a PDF report for academic-integrity proceedings?
Yes, signed accounts can export a timestamped PDF showing the sentence-level heatmap, full score breakdown, and our methodology citation. The PDF is cryptographically signed so it can be verified in a disciplinary hearing.
Do you integrate with learning management systems?
Yes. We have native integrations with Canvas, Blackboard, Moodle, and D2L. Essays scanned through the LMS never leave your institution's tenant. See our institutions page.