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Trusted by 500,000+ students

Check Your Essay With Decopy AI

The free AI detector that provides sentence-level analysis. Know exactly what might get flagged — and fix it before you submit to Turnitin.

99.2%
Accuracy Rate
3 sec
Avg. Analysis Time
Analyze Text — Free See How It Works
Decopy AI Content Detector
Ready to analyze
0 words • Up to 25,000 words
Zero Data Retention
No Account Needed
89% AI Detected
Only 11% of your text appears human-written. Your essay is at a very high risk of being flagged by Turnitin.
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The Science of AI Detection

Why Decopy AI is Essential for Students in 2026

As academic institutions rely more heavily on automated grading and plagiarism checkers, the risk of “false positives” has skyrocketed. A false positive occurs when perfectly legitimate, human-written text is flagged as AI-generated by systems like Turnitin or GPTZero.

Understanding Perplexity and Burstiness

Detectors don’t “read” your essay; they analyze its mathematical structure. They look for Perplexity (how predictable your vocabulary is) and Burstiness (how varied your sentence lengths are). If you write formally—using consistent sentence structures and common academic vocabulary—your writing might look “robotic” to an algorithm.

The ESL Disadvantage

Studies have shown that non-native English speakers (ESL students) are disproportionately flagged by AI detectors. Because they tend to use simpler, more standard vocabulary to avoid grammatical errors, their writing exhibits low perplexity. Decopy AI aims to level the playing field by providing a transparent, de-biased analysis of your text before you submit it, allowing you to manually introduce “burstiness” where needed.

The Problem

AI Detectors Are Flagging Human Writing

Even if you write every word yourself, you could still face an academic review. Here’s why you need Decopy AI.

False Positives Are Real

Well-structured, formal academic writing often triggers AI detectors — even when it’s 100% human-written.

Up to 7% false positive rate

ESL Students Hit Hardest

Non-native English speakers are flagged more often because simpler vocabulary looks “AI-like” to detectors.

61% wrongly flagged (Stanford)

Neurodivergent Writers

Students with ADHD or autism may have writing patterns that trigger false flags due to rigid syntax.

Higher false positive rates
The Solution

Know What Will Be Flagged — Before You Submit

Decopy AI analyzes your text sentence by sentence, showing exactly which parts might trigger AI detectors. Revise with confidence, not guesswork.

Sentence-Level Highlighting

See exactly which sentences might be flagged, not just a vague percentage.

Zero Data Retention

Your text is analyzed and immediately deleted. We never store or train on your work.

Decopy AI Results
94% Human
Climate change represents one of the most significant challenges facing humanity today. The multifaceted nature of this global phenomenon necessitates comprehensive interdisciplinary approaches. Rising sea levels threaten coastal communities, while extreme weather events become more frequent.
How It Works

Check Your Essay in 4 Simple Steps

No sign-up, no credit card, no hassle. Just paste your text and get instant results.

1

Paste Your Text

Copy your essay, paper, or any content into our detector. We support up to 25,000 words.

2

AI Analysis

Our algorithm analyzes each sentence for patterns that AI detectors typically flag.

3

See Results

Get sentence-level highlighting showing exactly what might be flagged and why.

4

Revise & Submit

Edit flagged sentences in your own voice, then submit with confidence.

Why Decopy AI

Built for Students, Not Cheaters

We don’t help you bypass detection. We help you prove you didn’t cheat.

ESL-Friendly Detection

Our algorithm is de-biased for non-native English speakers, reducing unfair false positives that plague other detectors.

Zero-Retention Policy

Your text is analyzed and immediately deleted. We never store, share, or use your work for AI training. Ever.

Instant Results

Get comprehensive analysis in under 3 seconds. No waiting, no queues, no email verification required.

Turnitin Correlation

Our detection patterns are calibrated to match what Turnitin and other institutional tools look for.

No Humanizer

We don’t offer text rewriting tools. Our mission is helping honest students, not enabling academic dishonesty.

100% Free

No hidden fees, no credit card, no premium tier. Every student deserves access to fair AI detection.

Comparison

Decopy AI vs. Other Detectors

Feature Decopy AI GPTZero Turnitin
Free to use ✓ Unlimited Limited free tier ✗ Institutional only
No sign-up required ✓ ✗ ✗
ESL de-biased ✓ ✓ ✗
Zero data retention ✓ Guaranteed Unclear policy ✗ Stores submissions
No humanizer offered ✓ Ethical stance ✗ ✓
FAQ

Frequently Asked Questions

Yes, Decopy AI is 100% free with no hidden fees. We believe every student deserves access to fair AI detection, regardless of their financial situation. No credit card, no premium tier, no limits.
No. Decopy AI has a strict Zero-Retention Policy. Your text is analyzed in real-time and immediately deleted from our servers. We never store, share, or use your work for AI training.
Decopy AI achieves 99.2% accuracy on benchmark tests. However, no AI detector is perfect. We provide sentence-level analysis so you can make informed decisions about your writing.
No. Using Decopy AI to check your own work is completely private. We don’t report usage to anyone, and there’s no way for institutions to know you used our tool.
Yes, our underlying detection model is continuously updated to recognize patterns from the latest Large Language Models, including ChatGPT, Claude , and Google Gemini.
AI detectors look for low perplexity and flat burstiness. To fix a false positive, try varying your sentence lengths, using more active voice, and inserting unique personal perspectives or anecdotes.
You can paste and analyze up to 25,000 words per scan. This is enough to cover entire research papers, dissertations, and long-form essays in a single click.
Currently, Decopy AI’s core detection algorithms are specifically calibrated and highly accurate for English text (including US, UK, Canadian, and Australian variations).
Turnitin is an institutional tool that universities use to grade you, and it stores your submissions in their database. Decopy AI is a student-first tool that helps you check your own work privately before submission, with zero data retention.
Absolutely. Our platform is 100% mobile-responsive, allowing you to check your essays directly from your smartphone or tablet with the same speed and accuracy as the desktop version.

Don’t Risk Your Academic Future

Check your essay before Turnitin does. It takes 30 seconds.

Check My Essay — Free