ZeroGPT vs QuillBot: Which AI Detector Actually Works?

🧠 Introduction

ZeroGPT and QuillBot both offer AI detectors that claim to identify AI-generated content, human-written text, and mixed writing.

They are two of the most commonly searched detection tools online, used by students, teachers, and writers looking to verify authenticity.

This review compares:

Accuracy
False positives
Mixed-text handling
Pricing
Transparency

By the end, you’ll know which detector actually works, and which one is worth using.

🎯 Overall Summary

If you want the short verdict:

ZeroGPT is more accurate overall.
QuillBot is more transparent about its detection model.
Both tools are usable, but ZeroGPT performs better in detection.

Now let's break down the results.

📊 Detection Accuracy Results

We tested both detectors using four text samples:

AI-generated
Human-written
Mixed text
TwainGPT-humanized text

Here are the results.

Accuracy Comparison Table

Text Type	ZeroGPT Result	QuillBot Result
AI-Generated Text	100% AI	100% AI
Human-Written Text	0% AI	14% AI
Mixed Text	65% AI	76% AI
TwainGPT Humanized	0% AI	0% AI

🧪 Human-Written Text Detection

False Positive Rates

Detector	False Positives
ZeroGPT	Medium
QuillBot	High

QuillBot is more likely to flag formal or structured human writing as AI, which makes it less reliable for academic or professional use.

🔄 Mixed-Text Behavior

Mixed text combines human writing with AI-generated parts, which is a common real-world scenario.

Mixed-Text Performance

ZeroGPT handles mixed writing reasonably well, although it sometimes labels too much of it as AI.
QuillBot struggles and often marks mixed text as mostly AI, even when most of the content is human-written.

ZeroGPT performs better in this category, but neither tool is perfect.

🔍 Transparency

QuillBot

Displays a public model version (currently v5.8.2)
Provides visible updates
Offers more clarity about how the system works

ZeroGPT

Does not list a model version
Does not publish release notes
Offers no insight into model changes

Winner for transparency: QuillBot

💰 Pricing Comparison

ZeroGPT Pricing

ZeroGPT offers a free AI detector with unlimited scans.

Paid plans include:

Plan	Price	Included Features
Pro	$9.99 / month	100,000 characters per detection
Plus	$19.99 / month	60 batch scans
Max	$26.99 / month	150,000 characters per detection

QuillBot Pricing

QuillBot previously allowed unlimited free detection.

Now, users receive limited free scans before being asked to upgrade.

Premium pricing:

Billing Cycle	Price
Annual	$8.33 / month
Quarterly	$13.31 / month
Monthly	$19.95 / month

QuillBot Premium unlocks unlimited AI detection as part of the subscription.

🧪 Which Detector Fits Your Needs?

For Students

ZeroGPT is more accurate and fully free
QuillBot is more likely to flag human writing incorrectly.

For Teachers

ZeroGPT is more dependable for academic use.

For Writers & Bloggers

ZeroGPT is better for routine, everyday checking.
QuillBot is helpful if you prefer transparency and already use the QuillBot ecosystem.

🥇 Final Verdict: ZeroGPT

ZeroGPT wins because:

It is more accurate
It has fewer false positives
It handles mixed text better
It is free to use
It performs more consistently

QuillBot’s transparency is impressive, but its detection accuracy is not as strong.

🚀 Want To Bypass ZeroGPT and QuillBot?

If you want to make AI text undetectable and bypass both ZeroGPT and QuillBot:

👉 TwainGPT

📌 FAQ

Is ZeroGPT more accurate than QuillBot?

Yes, ZeroGPT performed better in AI, human, and mixed-text detection.

Which detector has fewer false positives?

ZeroGPT has fewer false positives than QuillBot.

How can I bypass ZeroGPT or QuillBot?

Use TwainGPT, which humanizes AI text and bypasses AI detectors.