AI Essay Detector

Catch AI-Written Essays with Defensible Evidence

AI Essay Detector is a specialized detection tool purpose-built for academic writing. Unlike generic AI detectors, it delivers sentence-level analysis with color-coded heatmaps that show exactly which passages exhibit AI-like characteristics. With 0.94 AUC on academic corpus and a median response time of 1.8 seconds, it provides scholastic-grade detection you can take into real conversations with students, deans, or editorial boards.

Who It's For

The tool serves faculty, admissions readers, academic-integrity officers, journal editors, and anyone who reads hundreds of essays weekly. Students can check their drafts before submission to identify sentences that may read as AI-generated. Teachers get evidence-based scoring they can show students with rubric integration and bulk classroom scanning. Institutions can deploy it across entire districts or colleges with LMS integration, SSO, and DPA compliance.

Key Features & Capabilities

• Sentence-level heatmaps: Red/gold/green color-coding with per-sentence perplexity and burstiness scores, not just a single opaque percentage
• Academic-register training: Fine-tuned specifically on student essays, personal statements, and literature papers—not social media posts
• Model-aware detection: Different confidence scores for GPT-4o, Claude 4, Gemini 2.5, and 22 other models, with benchmarks updated every 14 days
• Hybrid-draft detection: Estimates the ratio of human-edited vs. model-native text, catching the most common form of AI cheating
• Multi-language support: 22 languages including English (US/UK), Spanish, French, German, and Portuguese
• Three-in-one analysis: Toggle between AI detection, plagiarism scanning (cross-references academic databases), and grammar checking (flags thesis clarity, passive voice, unsupported claims)
• Privacy by default: Text processed in-memory on Cloudflare's edge and immediately discarded; no training on user submissions

How It Works

1. Paste up to 3,000 characters (free tier) or drag-and-drop .docx/.pdf files
2. Review the sentence-level heatmap with confidence bands and cluster analysis
3. Export a signed PDF report with defensible evidence for student conferences or academic hearings

What Sets It Apart

Most detectors provide a single "AI probability: 83%" verdict. AI Essay Detector gives you a report you can defend—sentence-by-sentence breakdowns that distinguish high-confidence AI prose (red) from mixed-signal passages (gold) and strong human-voice markers (green). The tool continuously retrains on each new flagship model within two weeks of release, maintaining accuracy against GPT-4o, Claude 4, Gemini 2.5, and hybrid drafts. With 3.2M essays analyzed and transparent monthly updates on false-positive rates (especially for ESL writers), it's built for the rigor of academic integrity work.

Integrations & Deployment

Free tier requires no signup. Sign in for higher character limits and saved history. Institutional plans include LMS integration, SSO, DPA agreements, and SOC 2 Type II compliance (in progress). FERPA-aligned for educational use.