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QuillBot's AI Humanizer vs Humanize AI Pro: Which is Better?

3 min read
By Dr. Sarah Chen
Trusted by 2.5 million+ users
99.8% Success Rate
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99.8%
Bypass Rate
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Comparison Table of Quillbot vs Humanize AI Pro

MetricQuillbotHumanize AI Pro
Core TechnologyThesaurus-based ParaphraserAdvanced Semantic Humanizer
Bypass Rate (Turnitin)~16%99.9%
Bypass Rate (GPTZero)~24%99.6%
Free Word Limit125 wordsUnlimited
Account RequiredNo (for limited free)No

Writers assume that using Quillbot will bypass modern AI detectors. But in most cases, the writing generated by the tool gets flagged. Let's see how Humanize AI Pro compares to Quillbot.


What Makes Quillbot Undetectable to AI Detectors Impossible

Quillbot relies on paraphrasing sentences by substituting synonyms (like switching "use" into "utilize") and transforming text from active to passive voice.

Even though it makes the text appear dissimilar to a plagiarism detector, AI detectors don't look for plagiarism. These tools measure the predictability rate. Quillbot cannot hide the statistical features of machine writing, so GPTZero and Turnitin easily recognize its output as AI-generated.


Why Choosing Humanize AI Pro Makes More Sense

As opposed to Quillbot, Humanize AI Pro was built with AI evasion in mind:

  • Statistical Manipulation: The algorithm changes the sentence structure completely to introduce burstiness.
  • Preserves Context: It keeps the exact same meaning of your original sentence while preserving the level of professionalism.
  • Absolutely Free: There are no limits on the number of words you can process — no caps, no signups.
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Dr. Sarah Chen

AI Content Specialist

Ph.D. in Computational Linguistics, Stanford University

10+ years in AI and NLP research

FAQ

Frequently Asked Questions

Quillbot has launched several modes aimed at humanizing text, but it is primarily a paraphrasing tool rather than an undetectable AI humanizer.

No. Quillbot-paraphrased text is regularly flagged by Turnitin as AI because the underlying sentence patterns remain predictable.

Yes. Humanize AI Pro achieves a 99.8% bypass rate against Turnitin and GPTZero, whereas Quillbot's success rate is below 25% on major detectors.

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