Comparison 2026

Undetectable AI vs QuillBot

Undetectable AI is an AI humanizer with a free AI detector built in. QuillBot is a writing suite with a paraphraser, a free AI Humanizer and an AI Detector. We compared both, and HumanizeThisAI as a third option.

Quick Verdict

Undetectable AI is built for detector checks, QuillBot has more writing tools, and HumanizeThisAI has the lowest starting price.

Undetectable AI starts at $9.99/mo for 10,000 words (as of Oct 2026). QuillBot Premium is $19.95/mo or $8.33/mo billed yearly, and its humanizer is built to polish wording rather than beat detectors. HumanizeThisAI delivers 99%+ bypass rates, a free tier (1,000 words/month), and starts at $5.99/month.

Features

Feature Comparison

Feature comparison between Undetectable AI, QuillBot, and HumanizeThisAI
FeatureUndetectable AIQuillBotHumanizeThisAI
Free TierFree basic humanizer + 250-word trialUp to 125 words per run1,000 words/month
Multi-language Support55 (English primary)5 (humanizer), 23 (paraphraser)12 (Creator and up)
Built-in AI Detector
Tone or Style SettingsReading level + purpose

Looking for Something Better?

Want a humanizer that starts at $5.99/month and has a free plan with 1,000 words a month? Try HumanizeThisAI yourself.

Try HumanizeThisAI FreeSee HumanizeThisAI plans and pricing

Related Comparisons and Guides

HumanizeThisAI vs Undetectable AIHumanizeThisAI vs QuillBotUndetectable AI reviewFull QuillBot humanizer reviewBypass Turnitin AI detection

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 built mainly to get text past AI detectors. QuillBot is a wider writing suite whose AI Humanizer is meant to smooth wording, and QuillBot says it "isn't a tool for evading AI detection." HumanizeThisAI is built for detector checks like Undetectable AI and starts at a lower price.
How much does Undetectable AI cost vs QuillBot?+
Undetectable AI starts at $9.99/month billed monthly, or $5.00/month billed yearly ($60), for 10,000 words. QuillBot Premium costs $19.95 billed monthly or $8.33/month billed yearly ($99.95), and its free humanizer takes up to 125 words per run, while Premium removes the word limit. HumanizeThisAI starts at $5.99/month for 15,000 words, or $2.99/month billed yearly (prices as of Oct 2026).
Can QuillBot bypass Turnitin?+
QuillBot's paraphraser and AI Humanizer are built to improve wording, not to get past detectors like Turnitin, and Turnitin has detected AI text altered by paraphrasing tools since July 2024. Dedicated humanizers such as HumanizeThisAI are built for detector checks.
Which tool preserves meaning better: Undetectable AI or QuillBot?+
Both tools can change meaning while rewriting, so check names, numbers and claims in the output. HumanizeThisAI lets you lock key words with Keep these words on paid plans.
Do I need both Undetectable AI and QuillBot?+
No. Some writers pair QuillBot for grammar with Undetectable AI for detector checks, but HumanizeThisAI handles humanizing in one tool and starts at $5.99/month.
Which AI detectors can HumanizeThisAI bypass?+
HumanizeThisAI achieves 99%+ bypass rates against GPTZero, Turnitin, Originality.ai, Copyleaks, and ZeroGPT.