Introduction
QuillBot is one of the most popular AI writing tools, best known for its paraphraser and grammar checker. Over time, QuillBot has expanded its services to include an AI detector and an AI humanizer.
But how reliable are these tools? Today we’ll focus specifically on QuillBot’s AI detector and AI humanizer.
🔎 Transparency and Updates
QuillBot has become more transparent compared to the past. The platform now provides model numbers for its AI detector, showing which version is active.
- Provides some visibility into the detection system.
- Less transparent than GPTZero, but better than many competitors.
🖥 User Experience
QuillBot offers a smooth user experience:
- Fast and simple → Paste text and get results instantly.
- All-in-one design → Users can switch between detector, grammar checker, plagiarism checker, and more.
- Clean interface → Easy to navigate for both students and professionals.
💰 Pricing
QuillBot’s AI detector used to be free with unlimited scans if you logged in. Now:
- Free scans → Limited, with a long cooldown before more become available.
- Premium plan → Required for consistent scanning, along with access to higher limits and advanced features.
🎯 Features
QuillBot offers a wide suite of tools:
- AI Detector → Identifies text written by AI.
- AI Humanizer → Attempts to rewrite AI text into more human-like writing.
- Paraphraser → Rewrites content for clarity and variation.
- Grammar Checker → Corrects mistakes and improves readability.
- Plagiarism Checker → Scans for overlap against published sources.
📊 Performance Testing
We tested QuillBot’s AI detector across four scenarios:
- GPT-5 text
- Human text
- AI Humanizer (QuillBot)
- AI Humanizer (TwainGPT)
| GPT-5 Text | Human Text | QuillBot | TwainGPT |
|---|---|---|---|
| 100% AI | 0% AI | 100% AI | 0% AI |
Results:
- GPT-5 text was flagged correctly as 100% AI.
- Human writing was correctly detected as 0% AI.
- QuillBot’s own AI humanizer failed, flagged as 100% AI.
- TwainGPT bypassed QuillBot’s AI detector, scoring 0% AI.
✅ Pros and ❌ Cons
Pros
- Fast and reliable AI detector
- Trusted, widely used tool
- Clean user experience
Cons
- Free scans limited, requires subscription
- AI humanizer doesn’t bypass AI detectors
🏁 Final Verdict
QuillBot has a reliable AI detector. It is fast, trusted, and accurate at detecting AI text.
But its AI humanizer is weak. It doesn’t bypass AI detectors and likely wasn’t designed to, making it ineffective for that purpose.
When it comes to AI detection, QuillBot works well. But if you need to bypass AI detectors, TwainGPT is the clear choice.
✅ Bypass QuillBot with TwainGPT: Sign Up Today