Which AI Text Humanizer Can Bypass Detectors Reliably: Undetectable AI or Humaniser

AI humanizers had one job. Take text that reads like a machine wrote it, and make it sound like a person did.

Simple enough in theory. In practice, the detectors on the other side have gotten sharper, and the margin between passing and getting flagged keeps shrinking.

Undetectable AI is one of the more established names in this space. It pairs a detector with a humanizer, and has built up a user base of over 23 million people..

Humaniser covers the same ground. Two tools making similar promises. 

We ran both through the same six tests using TruthScan as the benchmark detector to find out which one actually delivers.

What is Undetectable AI?

Undetectable AI is a platform that handles both AI detection and humanization. The workflow is built around the idea that you detect first, then humanize, giving you a clear picture of where your content stands before you start rewriting.

It supports output from all major models including GPT-4, Claude, Gemini, DeepSeek, and others, and lets you tailor humanization by readability level and content type, covering general writing, essays, articles, marketing material, and more.

There is a free version of the humanizer, but it runs on a basic model that may still get flagged. 

The full Undetectable engine, which the tool claims gives you 99% human scores with confidence, requires signing up for a paid plan. 

You can create an account and get access to its basic model. To get its full capability here’s how the pricing breaks down:

• Starter: $9.99/month (or $5/month billed annually) — 10,000 words/month
• Business: $19.99/month (or $10/month billed annually) — 50,000 words/month, priority processing
• Unlimited/100K: $29.99/month (or $15/month billed annually) — 100,000 words/month, API access
• Unlimited: $49/month — unlimited words, API access
• Enterprise: Custom pricing with bulk credits and business plans

What is Humaniser.com?

Humaniser is also a dual-function platform, offering both AI detection and humanization. Like Undetectable, it lets you paste text, check whether it reads as AI-generated, and then humanize it if needed.

The free tier is genuinely accessible however these are capped at three uses per day and 200 words per input, with English only and the Standard model. 

Paid plans unlock the Max model, higher word limits, more daily uses, and multilingual support.

Pricing:

• Free: $0/month — 3 uses/day, 200 words/input, English only, Standard model
• Basic: $5/month ($60/year) — 15 uses/day, 500 words/input, Max model, all languages
• Pro: $10/month ($120/year) — 50 uses/day, 1,000 words/input, Max model, all languages
• Max: $20/month ($240/year) — Unlimited uses, unlimited input length, Max model, priority support under 2 hours
• Enterprise: Custom pricing with team features, dedicated support, and SLA guarantees

Both tools support 50+ languages. Undetectable flags English as its strongest performer while Humaniser treats multilingual output as equally capable across languages.

A Quick Note on Privacy

Both tools process submitted text through their servers, so avoid uploading anything sensitive or confidential.

Humaniser states that content is processed securely and deleted immediately after humanization, with a zero data retention policy. 

Undetectable AI similarly states that text is never stored or used to train its models.

On paper, both take the same position. Neither retains your content.

The Test Setup

We generated five AI-written text samples, two each from ChatGPT and Claude and one from Gemini. 

Each sample was run through both Undetectable AI and Humaniser.com independently. 

The humanized outputs were then scored by TruthScan, which serves as our benchmark detector for this comparison.

Lower scores mean the humanized text reads as more human..

AI Humanization Test Results: Undetectable AI vs Humaniser.com

Test 1: ChatGPT-Generated Text (Sample A)

Undetectable AI Did not bypass the AI Detector
AI Likelihood Score: 80%

Humaniser Did not bypass the AI Detector
AI Likelihood Score: 57%

Test 2: ChatGPT-Generated Text (Sample B)

Undetectable AI Did not bypass the AI Detector
AI Likelihood Score: 88%

Humaniser Successfully by-passed the AI Detector with a likely human score
AI Likelihood Score: 34%

Test 3: Gemini-Generated Text 

Undetectable AI Barely passed the AI-Detector with a Partial AI score
AI Likelihood Score: 44%

Humaniser Did not pass the AI Detector with a Partially AI score
AI Likelihood Score: 58%

Test 4: Claude-Generated Text (Sample A)

Undetectable AI did not Pass the AI Text Detector
AI Likelihood Score: 80%

Humaniser Barely passed the AI-Detector with a Partial AI score 
AI Likelihood Score: 35%

Test 5: Claude-Generated Text (Sample B)

Undetectable AI Did not pass the AI Detector
AI Likelihood Score: 89%

Humaniser Did not pass the AI Text Detector with a Likely AI Score
AI Likelihood Score: 70%

Average Scores

Test	Undetectable AI	Humaniser.com
#1 ChatGPT (A)	80%	57%
#2 ChatGPT (B)	88%	34%
#3 Gemini	44%	58%
#4 Claude (A)	80%	35%
#5 Claude (B)	89%	70%
Average	76.2%	50.8%

My Final Thoughts

One important caveat before drawing any conclusions, the Undetectable AI results here reflect its Basic public model, not the full Undetectable engine. With that context in mind. 

Humaniser had the better run. It averaged 50.8% across five tests against Undetectable's 76.2%, and won four of the five matchups. It also produced the only result in this test that TruthScan called likely human, a 34% on ChatGPT Sample B, while Undetectable returned 88% on that same input.

Humaniser wasn't perfect either. A 70% on the second Claude sample and a 58% on Gemini show it has inputs it struggles with. But relative to what Undetectable's basic model was working with, it held up noticeably better across the board.

The one test Undetectable edged out was Gemini, where it landed at 44% against Humaniser's 58%. A narrow win, but a win.

If you're evaluating Undetectable AI seriously, the paid tier is where its real capability lives and that's a different conversation. 

What this test does show is that Humaniser's free and low-cost tiers punch above their weight, and for anyone who needs a humanizer that works without a subscription, it's a strong starting point.