Free AI Content Detector — Detect ChatGPT & Claude Text
Paste your text or upload a file to detect AI-generated content with sentence-level analysis and confidence scores.
ContentGuard vs Turnitin & Other AI Detectors
| Detector Feature | ContentGuard AI | Turnitin AI | GPTZero | Copyleaks |
|---|---|---|---|---|
| Pricing Model | ₹0 Free Forever | Enterprise Only | Freemium (Strict Limits) | Paid Subscriptions Only |
| Signup Required | No Account Needed | Yes (Institution) | Yes (For high usage) | Yes |
| Data Privacy | 100% Client-Side Scan (No Logs) | Saves to Institutional DB | Varies by tier | Logs for indexing |
| Sentence Highlighting | Yes (Color-coded probabilities) | Yes (Score only for most) | Yes | Yes |
| Sentence Metrics | Perplexity + Burstiness Stats | Hidden algorithms | Basic statistics | Binary classification |
How Does Free AI Content Detection Work?
AI writing engines like ChatGPT, Gemini, and Claude compose text by selecting the most statistically probable next word (token) based on their training sets. Because of this mathematical process, AI-generated content exhibits highly predictable styles that differ from human writing.
ContentGuard's local offline engine measures these structural properties through advanced linguistic heuristics:
1. Perplexity Analysis
Perplexity measures how complex or unpredictable the vocabulary is. Human writing has high perplexity because we choose rare words, personal analogies, or unexpected transitions, whereas AI utilizes highly common word pairings.
2. Burstiness & Uniformity
Burstiness measures variance in sentence lengths and structure. Humans naturally write in bursts—mixing short punchy phrases with long, winded dependent clauses. AI writes with very uniform sentence lengths and rhythmic structures.
3. AI Transition Words
Generative models rely on specific transition keywords (e.g., “furthermore”, “it is important to note”, “moreover”, “delve”, “testament”). ContentGuard tracks these over-represented phrases to gauge writing authenticity.
Frequently Asked Questions (FAQs)
QHow accurate is the ContentGuard AI detector?
ContentGuard combines statistical local heuristics (perplexity, burstiness, pattern spacing) with server-side Hugging Face calibrations. This hybrid model achieves 98%+ accuracy on raw GPT-4, Gemini, and Claude text, minimizing false positives.
QCan this tool detect rewritten or humanized text?
It depends. Simple synonym swaps from tools like QuillBot are easily detected because the underlying sentence length variance (burstiness) remains highly uniform. However, fully humanized text with varied phrasing and contractions will bypass standard detectors.
QIs there a fee or word count limit?
No! ContentGuard is free of charge (₹0). You can scan unlimited documents or essays up to 50,000 characters per request without ever needing an account or paying for credits.
QDoes ContentGuard store my uploaded text or essays?
Never. Your privacy is our priority. Scans are processed in-browser using Web Workers or server-side API memory; we do not store, catalog, or save your text to any database. Scans are saved solely in your local browser history.
QCan teachers detect ChatGPT writing?
Yes. Most educational institutions use Turnitin or Copyleaks, which look for similar statistical patterns. ContentGuard helps students and writers test their own drafts beforehand to ensure their work reads organically.
QWhy is local detection important?
Traditional APIs frequently hit rate limits, undergo downtime, or lock features behind paywalls. ContentGuard runs locally, ensuring offline capability, faster response times, and free access.