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AI Essay Detector · Scholastic-Grade
Catch AI-written essays in under 3 seconds.
Purpose-built for academic text. Sentence-level evidence. Free to try, no signup.
- 0.94 AUC on academic corpus.
- Sentence-level heatmap, not just one number.
- Works on GPT-4o, Claude 4, Gemini 2.5, hybrid drafts.
From paste to evidence in three steps
How an essay check actually goes.
2
Read the heatmap
Sentence-level red/gold/green with confidence bands. Cluster, not single number.
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Have a real conversation
Take the signed PDF to the student, the dean, the editorial board. Defensible evidence.
Built for the people who actually grade essays.
Faculty, admissions readers, academic-integrity officers, editors, the people who read hundreds of essays a week don't want another 'AI probability: 83%.' They want evidence.
Sentence-level signal
See exactly which sentences look model-generated, with per-sentence perplexity and burstiness. Not a single opaque percentage.
Academic-register trained
Our detector is fine-tuned on student essays, personal statements, and literature papers, not Reddit posts. Register-aware.
Model-aware confidence
Different scores for GPT-4o vs Claude 4 vs Gemini 2.5. Our benchmark updates every 14 days with new flagship releases.
Hybrid-draft detection
Most cheating isn't pure AI, it's 'write a draft then edit.' We estimate the ratio of human-edited vs model-native text.
Privacy by default
Text never leaves the Cloudflare edge in a persisted form. No training on user submissions. No silent logging of content.
Free, until you need more
3,000 characters free per request. Sign in for higher quotas and saved history. Institutional plans available.
What you actually get back
A report you can take to a conversation.
Not a single opaque percentage. Each sentence gets its own AI-likelihood score, color-coded so you can see at a glance where the signal concentrates. The headline number is just the summary.
- Red sentences: high-confidence AI-like prose. Defensible to flag.
- Gold sentences: mixed signal. Probably worth a look but not damning.
- Green sentences: strong human-voice markers. The "grandmother button jar" example is the kind of detail models rarely produce.
By the numbers
What "scholastic-grade" actually means.
0.94
AUC on held-out academic corpus
Highest in our published 2026 benchmark across 7 detectors. Independent of training data.
3.2M
Essays analyzed
Trailing 12 months. Median response time 1.8 seconds.
22
Languages supported
English (US/UK), Spanish, French, German, Portuguese top the accuracy table.
2.3×
ESL ÷ native FPR ratio
Down from 3.1× a year ago. Target below 1.5×. Published monthly on /transparency.
One tool, every writing problem.
Same widget, three analyses. Swap modes without re-pasting the text.
AI detection
Per-sentence AI likelihood with perplexity + burstiness + human-voice markers. More →
Plagiarism scan
Cross-reference against academic databases and open web. Identifies matched passages, not just scores. More →
Grammar check
Beyond typos, we flag thesis clarity, passive voice, unsupported claims. More →
One tool, every writing problem.
Same widget, three analyses. Swap modes without re-pasting the text.
AI detection
Per-sentence AI likelihood with perplexity + burstiness + human-voice markers. More →
Plagiarism scan
Cross-reference against academic databases and open web. Identifies matched passages, not just scores. More →
Grammar check
Beyond typos, we flag thesis clarity, passive voice, unsupported claims. More →
Who uses aiessaydetector.ai?
For students
Check your draft before you submit. See exactly which sentences read as AI-generated and revise with voice.
For teachers
Evidence-based AI scoring you can show a student. Rubric integration. Bulk classroom scanning.
For institutions
LMS integration, DPA, SOC 2, single sign-on. Deploy across your faculty in a quarter.
Frequently asked questions
Is aiessaydetector.ai free to use?
Yes. The detector, plagiarism checker, and grammar tools are free for essays up to 3,000 characters. Sign in for higher limits and saved history.
How accurate is AI detection?
Our model is trained specifically on academic writing, essays, application drafts, research paragraphs. We report a confidence score at sentence level, not just a single yes/no verdict, so educators can see exactly where AI signal concentrates. Independent evaluations on a held-out academic corpus put our AUC above 0.94.
Do you store the text I paste in?
No. Submitted text is processed in memory on Cloudflare's edge, used once for the score, and discarded. We do not train on user-submitted text.
Which AI models can you detect?
GPT-4, GPT-4o, Claude 3/3.5/4, Gemini 1.5/2.5, Llama 3/4, Mistral, Qwen, DeepSeek, plus hybrid human-AI drafts. We continuously retrain on each new flagship model within two weeks of release.
Can a teacher fail a student based on this score?
No detector is a court of law. We publish sentence-level evidence so educators can have an informed conversation with the student, not a unilateral verdict. Our methodology page explains the limits.
Ready to check an essay?
Free to try. Your text is processed in-memory and discarded.
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