Honest Comparison 2026

QuillBot vs Grammarly

QuillBot and Grammarly are writing assistants — not AI humanizers. We tested whether either can actually bypass AI detectors, and compared both to a purpose-built tool.

Quick Verdict

Neither was built for AI bypass — HumanizeThisAI is the tool you actually need.

QuillBot's paraphraser and Grammarly's rewriting features can slightly reduce AI detection scores, but neither consistently bypasses modern detectors. HumanizeThisAI is purpose-built for AI humanization with 99%+ bypass rates.

Features

Feature Comparison

Feature comparison between QuillBot, Grammarly, and HumanizeThisAI
Feature	QuillBot	Grammarly	HumanizeThisAI
AI Detection Bypass	42-52%	~48%	99%
Turnitin Bypass			99.8%
Grammar Checking
Paraphrasing
Free Tier	125 words	Limited	1,000 words/month
Purpose-Built for AI Bypass
Plagiarism Checker
Multi-language Support	30+	30+	12

Test Results

AI Detection Bypass Rates

Same text processed through all tools, tested against major AI detectors

AI detection bypass rate comparison between QuillBot, Grammarly, and HumanizeThisAI
AI Detector	QuillBot	Grammarly	HumanizeThisAI
GPTZero	42%	48%	99%
Turnitin	35%	45%	99.8%
Originality.ai	38%	46%	99.7%
Copyleaks	45%	50%	98%
ZeroGPT	52%	55%	99%

Looking for Something Better?

QuillBot and Grammarly are great for writing — but terrible for AI bypass. HumanizeThisAI is the purpose-built humanizer you need. Try free with 1,000 words.

Try HumanizeThisAI Free See Pricing

FAQ

QuillBot vs Grammarly FAQ

Common questions about QuillBot, Grammarly, and HumanizeThisAI.

Is QuillBot better than Grammarly for AI humanization?+

Both have strengths and weaknesses. QuillBot and Grammarly each serve different needs, but HumanizeThisAI consistently outperforms both on bypass rates, pricing, and output quality.

How much does QuillBot cost compared to Grammarly?+

Pricing varies by plan, but both tend to be more expensive than HumanizeThisAI which starts at just $5.99/month with better features and higher bypass rates.

Can QuillBot or Grammarly bypass Turnitin?+

Results vary. Neither tool consistently achieves the 99.8%+ Turnitin bypass rate that HumanizeThisAI delivers. We recommend testing all three with your specific content.

Which AI detectors does HumanizeThisAI bypass?+

HumanizeThisAI achieves 99%+ bypass rates against GPTZero, Turnitin, Originality.ai, Copyleaks, and ZeroGPT — outperforming both QuillBot and Grammarly.

Is there a free trial for HumanizeThisAI?+

Yes. Try it instantly with no signup (3 free uses per day), or sign up free for 1,000 words/month. No credit card needed.

Does HumanizeThisAI preserve the original meaning?+

Yes. Our AI humanizer is designed to preserve your original meaning, arguments, and structure while transforming the writing patterns that AI detectors look for.