QuillBot AI Detector Review 2026: Is It Actually Accurate?

The QuillBot AI detector is a free tool built into QuillBot's writing platform that claims to identify whether text was written by a human or generated by AI. With millions of users already on QuillBot for paraphrasing and grammar checking, the AI detector has become a popular go-to for students and educators.

But is the QuillBot AI detector actually accurate? Can it reliably tell the difference between human and AI writing? And more importantly — can it be bypassed? We ran extensive tests to find out.

What Is the QuillBot AI Detector?

The QuillBot AI detector is a feature within the QuillBot platform that scans text and provides a percentage score indicating how likely the content is AI-generated. It's free to use (with word limits) and accessible directly through the QuillBot website.

Unlike dedicated detection platforms like Turnitin or Originality.ai, the QuillBot AI detector is positioned as a supplementary tool within a broader writing suite. This distinction matters — it wasn't built from the ground up as a detection engine, which affects its accuracy and reliability.

How We Tested the QuillBot AI Detector

We tested the QuillBot AI detector using three categories of text:

• 100% AI-generated: Five samples from ChatGPT (GPT-4) across different content types
• 100% human-written: Five samples written entirely by human authors
• AI text humanized by AuraWrite AI: The same AI samples processed through AuraWrite AI

We then compared the QuillBot AI detector's results against four other major detectors to see how it stacks up:

Test 1: Detecting Raw AI-Generated Text

The QuillBot AI detector performs reasonably well on raw AI text — catching most AI-generated content with scores above 70%. However, it's notably less consistent than Turnitin and Originality.ai, especially on shorter content types like emails and product descriptions where it scored as low as 69%.

Test 2: False Positives on Human-Written Text

A critical test for any AI detector is whether it incorrectly flags human-written text as AI-generated. We tested five 100% human-written samples:

This is where the QuillBot AI detector shows a significant weakness. It incorrectly flagged 2 out of 5 human-written samples as potentially AI-generated, with an average AI score of 24% on text that was 100% human. Turnitin and Originality.ai had zero false positives. This high false positive rate makes the QuillBot AI detector unreliable as a sole detection tool for educators making academic integrity decisions.

Test 3: Can AuraWrite AI Bypass the QuillBot AI Detector?

We ran the same five AI-generated samples through AuraWrite AI and then tested the humanized output against the QuillBot AI detector and all other major detectors:

Yes — AuraWrite AI bypasses the QuillBot AI detector completely, scoring just 3% AI on average. But more importantly, AuraWrite AI also bypasses every other major detector on the list, including Turnitin and Originality.ai. This means even if your school or publisher uses the QuillBot AI detector alongside stricter tools, AuraWrite AI's output will pass them all.

QuillBot AI Detector: Pros and Cons

QuillBot AI Detector vs Other Major Detectors

The QuillBot AI detector is a mid-tier detector — fine for a quick, free check on raw AI text, but not reliable enough for high-stakes academic or professional decisions. Its high false positive rate is a serious concern for educators who might wrongly accuse students of using AI.

Who Should Use the QuillBot AI Detector?

What This Means If You're Trying to Bypass AI Detectors

If the QuillBot AI detector is the only tool your school or employer uses, the bar is relatively low. Even basic humanizers can often get past it. However, most institutions use multiple detectors — and the QuillBot AI detector is rarely the primary tool.

That's why you need a humanizer that doesn't just beat one detector — it needs to beat all of them. AuraWrite AI is the only tool we've tested that consistently scores under 5% AI detection across every major detector, including the QuillBot AI detector, Turnitin, Originality.ai, GPTZero, Copyleaks, and ZeroGPT.

Final Verdict

The QuillBot AI detector is a decent free tool for quick checks, but it's not accurate enough to rely on for serious detection needs. Its high false positive rate (flagging 40% of human text) and inability to catch humanized content make it a supplementary tool at best.

For writers and students: if the QuillBot AI detector is what you're worried about, AuraWrite AI bypasses it effortlessly — along with every other major detector. With 500 free words and no credit card required, you can verify this yourself in under a minute.