Honest Comparison 2026

Undetectable AI vs QuillBot

Undetectable AI is a dedicated AI humanizer. QuillBot is a paraphrasing tool that some use for AI detection bypass. We compared both — and found a better option.

Quick Verdict

Undetectable AI wins on bypass rates, QuillBot wins on writing tools — but HumanizeThisAI beats both.

Undetectable AI has decent bypass rates but expensive monthly pricing ($19/mo). QuillBot is affordable but wasn't built for AI detection bypass. HumanizeThisAI delivers the highest bypass rates (99%+), a generous free tier (1,000 words/month), and starts at just $5.99/month.

Features

Feature Comparison

Feature comparison between Undetectable AI, QuillBot, and HumanizeThisAI
FeatureUndetectable AIQuillBotHumanizeThisAI
AI Detection Bypass88%45%99%
Turnitin Bypass80%99.8%
Meaning PreservationGoodModerateExcellent
Free TierFree trial125 words1,000 words/month
Multi-language Support30+30+12
Built-in AI Detector
Tone Customization
Bulk Processing

Test Results

AI Detection Bypass Rates

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

AI detection bypass rate comparison between Undetectable AI, QuillBot, and HumanizeThisAI
AI DetectorUndetectable AIQuillBotHumanizeThisAI
GPTZero85%40%99%
Turnitin78%25%99.8%
Originality.ai72%30%99.7%
Copyleaks82%35%98%
ZeroGPT88%50%99%

Looking for Something Better?

Why settle for Undetectable AI or QuillBot when HumanizeThisAI offers higher bypass rates, better pricing, and a free trial with 1,000 words? Try it yourself.

Try HumanizeThisAI FreeSee Pricing

FAQ

Undetectable AI vs QuillBot FAQ

Common questions about Undetectable AI, QuillBot, and HumanizeThisAI.

Is Undetectable AI better than QuillBot for bypassing AI detection?+
Undetectable AI is purpose-built for AI detection bypass and generally outperforms QuillBot at evading detectors. However, QuillBot offers broader writing tools. HumanizeThisAI combines the best of both — high bypass rates plus quality output at a lower price.
How much does Undetectable AI cost vs QuillBot?+
Undetectable AI starts at $19/month for 10,000 words (or $5/mo billed annually). QuillBot Premium costs $4.17/month (billed annually) but its humanization features are limited. HumanizeThisAI starts at $5.99/month with better bypass rates than both.
Can QuillBot bypass Turnitin?+
QuillBot's paraphraser is not specifically designed to bypass AI detectors like Turnitin. It may reduce some detection flags, but dedicated humanizers like HumanizeThisAI achieve significantly higher bypass rates against Turnitin.
Which tool preserves meaning better — Undetectable AI or QuillBot?+
Both tools can alter meaning during rewriting. QuillBot tends to change vocabulary aggressively, while Undetectable AI can sometimes produce awkward phrasing. HumanizeThisAI focuses on preserving your original meaning while achieving high bypass rates.
Do I need both Undetectable AI and QuillBot?+
No. Many users subscribe to both — QuillBot for grammar and Undetectable AI for bypass — but HumanizeThisAI handles both humanization and quality output in a single, more affordable tool.
What AI detectors can HumanizeThisAI bypass that the others cannot?+
HumanizeThisAI achieves 99%+ bypass rates against GPTZero, Turnitin, Originality.ai, Copyleaks, and ZeroGPT. Undetectable AI struggles with Originality.ai updates, and QuillBot fails most dedicated AI detectors.