Grubby AI Review: Our Honest Verdict

The AI writing industry is booming.

It crossed $1.7 billion in 2023, and is projected to hit $7.6 billion by 2032.

With that kind of money on the table, it’s no surprise that hundreds of AI writing tools are flooding the market. 

And right behind them is a wave of “AI humanizers,” where each promises to make your content bypass the detectors.

We see different AI tools emerging every other day. 

In fact, global search interest for “AI humanizers” has jumped 120% in the past year. 

But do these tools deliver on their promises?

The only way to know is to test them.

In this Grubby AI review, we’re putting one of these humanizer tools under the microscope: Grubby AI humanizer. 

We’ll break down what it is, explore its core features, and examine its different pricing plans. 

More importantly, we’ll test Grubby AI humanized output against three different AI detectors, lay out the pros and cons, and show you which alternatives might work better.

Let’s get started.

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Key Takeaways

• Testing Results: Out of 3 major AI detectors, it bypassed 1 (GPTZero). Originality AI and Undetectable AI still flagged the content as AI-written

• Grubby AI humanizer is designed to rewrite AI-generated content to sound more natural

• The free plan offers 300 words/month. Paid plans start at $7.99/month

• Best suited for plain English content, basic emails, and short essays

• No built-in AI detection feature, strictly a humanization tool

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What Is the Grubby AI Humanizer?

Grubby AI Humanizer is an online tool that rewrites AI-generated content so it sounds more natural and human-like. 

Its main purpose is to help users bypass AI detectors. 

If you’re a student, writer, or marketer, you can take content from ChatGPT or any other AI tool, and humanize from Grubby AI Humanizer to get a smoother, more natural version of your text.

The tool is promoted as an “AI detection remover,” and is designed mainly for people who don’t want their work flagged as AI-written. 

Unlike some competitors, Grubby AI Humanizer doesn’t include an AI detector, it only focuses on rewriting.

There’s not much public information about the company. Trustpilot lists Grubby.ai as U.S.-based, and a founder named Brad has been mentioned in online forums.

Grubby AI claims to support 30+ languages, but it performs best in English. In testing, for example, French text was often translated into English rather than rewritten in French.

Core Features Overview

The main feature of Grubby AI Humanizer is AI Text Rewriting.

The tool changes words, sentence structure, tone, and flow in a way that the text sounds natural. 

Reviews show that it works well for plain English content and removes the typical “AI-style” feel.

Grubby AI also offers some extra tools, mainly for students:

• Summarizer: Produces short, clear summaries that highlight the main points of essays and articles.
  
• Smart Notes: Breaks down long text into organized bullet-point notes with headings, making it easier to study.
  
• Quizzes: Generates multiple-choice and true/false questions directly from the text. The questions are clear, relevant, and can help teachers save preparation time.
  
• Flashcards: Builds Q&A flashcards. Each card highlights one important point which makes it simple to review and memorize. 

Grubby AI Humanizer Pricing and Plans

Let’s take a look at Grubby AI Humanizer pricing and plans:

Plan	Words/ Month	Monthly Price	Annual Price	Features Included
Free	300	$0	$0	Humanization only (no card required)
Essential	7,500	$7.99	$47.88	All features: Summarizer, Smart Notes, Quizzes, Flashcards
Pro	15,000	$14.99	$179.88	All features included
Business	30,000	$29.99	$359.88	All features included
Enterprise	60,000	$59.99	$719.88	All features included

In short,

• Free plan available with 300 words/month.
• Paid plans start at around $8/month (annual billing) and go up to $60/month depending on word limits.

How Grubby AI Humanizer Works

We have tested Grubby AI Humanizer against three different AI detectors to check if its claims are true or not.

Before sharing our own results, let’s first look at what independent testers have found.

Third-party reviews suggest that Grubby AI Humanizer delivers mixed performance. For example:

• Originality AI: Even after running text through Grubby AI, the score only dropped slightly, from 100% AI to 98% AI. It was still flagged as machine-generated.
  
• Writer: The rewritten text was rated as 100% human, compared to just 85% for the original draft.
  
• ZeroGPT: The AI score fell from 100% down to just 9.4%, meaning the text almost escaped detection.
  

This means Grubby AI Humanizer can sometimes bypass detectors like ZeroGPT or Writer.

Our Own Test

Here’s the process we followed to test Grubby AI Humanizer ourselves:

1. Generated a sample paragraph with ChatGPT.

2. Checked it against three detectors for baseline testing: Originality.ai, GPTZero, and Undetectable AI.

3. Ran the same paragraph through Grubby’s “Humanize” function.

4. Re-tested the humanized version with the same detectors.

The Results

Detector	Before Humanize	After Grubby Humanize
Undetectable AI	99% AI	99% AI (no change)
Originality AI	100% AI	0% AI (passed)
GPTZero	100% AI	99% AI (still flagged)

• Originality.ai: The score dropped slightly but was still flagged as AI-generated.
• GPTZero: This is where Grubby AI Humanizer performed best. The text went from fully flagged to passing as 100% human.
• Undetectable AI: No difference. The content stayed flagged.

For users who need dependable results, we recommend pairing two of our own tools:

• Undetectable AI Detector: Quickly shows whether your text still looks AI-generated.
  
• Undetectable AI Humanizer: Rewrites flagged sections until your content reads naturally and passes top detectors.

Using these together gives you a more trustworthy way to check, fix, and finalize your content so it appears fully human.

Grubby AI Pros and Cons

Here are the pros and cons of Grubby AI Humanizer:

Pros

• Very easy to use with a clean, beginner-friendly interface.
• Outputs flow more naturally and feel “less robotic.”
• Improves readability for plain English content.
• Affordable: free tier available. Paid plans start under $8/month for thousands of words.
• Extra tools (Summarizer, Smart Notes, Quizzes, Flashcards) add real value beyond rewriting.
• Often bypasses basic AI and plagiarism checkers, helping with simple detection tests.
• Works well for basic tasks like emails, short essays, and marketing copy.

Cons

• Claims 30+ languages but usually translates non-English text into English before rewriting.
• Struggles with complex or highly technical content, manual editing often needed.
• Results are not guaranteed to bypass all AI detectors.
• The company admits in its FAQ that outputs may still get flagged.
• Customer support can be slow, and product updates are infrequent.
• No refund policy if text still gets flagged.

Grubby AI vs. Competitors

Tool	Function	Humanization Quality	Extra Features	Pricing
Grubby AI	Humanizer	Good for plain English, removes “AI feel”	Summarizer, Smart Notes, Quizzes, Flashcards	Free + paid plans from ~$8/mo
Quillbot	Paraphraser + limited detector	Decent paraphrasing, less nuanced than Grubby	Grammar checker, citation generator	Free + premium plans from ~$10/mo
Toolsmart’s Humanize AI	Humanizer	Similar to Grubby, plain rewrite focus	None notable	Low-cost plans
Undetectable.ai	Humanizer + Detector	High-quality rewriting (100% accuracy of detector)	Detection + Humanization in one	Paid plans

Can Grubby AI Detect AI-Edited or Paraphrased Text?

No. Grubby AI is strictly a humanizer, not a detector. It has no feature to analyze or label input as AI-written. Its focus is strictly on rewriting text to make it sound more natural.

If you input text that has already been edited or paraphrased by another AI tool, Grubby AI won’t identify it.

Instead, it will simply rewrite the text again.

But if you’re looking for the detection and humanization feature at one place, you can use Undetectable AI. It includes both detection and rewriting. 

Independent tests from ZDNet have shown that its detector can reliably identify 100% of paraphrased AI-generated content. 

For example, if someone used ChatGPT to create text, ran it through QuillBot, and then processed it again with Grubby AI Humanizer, Undetectable AI would still flag it as AI-generated.

Try this for detecting AI-edited and paraphrased text with accuracy.

Grubby AI Humanizer vs. Undetectable AI Humanizer

Unlike Grubby AI Humanizer, Undetectable AI’s AI Humanizer delivers several major advantages that make it more powerful and reliable.

1. Backed by a Best-in-Class Detector

• Undetectable AI detects 100% of paraphrased AI content in independent tests. It automatically rewrites flagged text to ensure it passes safely. The tools also offer a satisfaction guarantee. 
• Grubby AI offers no detection, no safeguards, and no refund policy.

2. Broader Language Support

• Grubby AI claims 30+ languages but mostly works in English.
• Undetectable.ai supports dozens of languages including Arabic, Chinese, and German.

3. Privacy and Customer Support

• Undetectable ai offers bank-grade encryption that protects all uploads. 24/7 live support ensures fast, reliable help.
• Grubby AI users report:
  • Slow or unresponsive customer service.
  • Limited updates and troubleshooting options.

4. Proven Performance and Global Trust

• Undetectable AI is trusted by 20+ million users worldwide. It’s also featured in Forbes, Business Insider, and other major outlets.

• Grubby AI is newer, with:
  • Fewer independent reviews.
  • Less proof of long-term reliability.

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Conclusion

In this Grubby AI review, we’ve found that Grubby AI humanizer is a decent entry-level tool for basic content humanization.

It works well for simple tasks like emails, short essays, and marketing copy, especially when you’re working with plain English text.

However, this Grubby AI review also shows big problems. 

Its results are not always the same on AI detectors, it does not fully support many languages, and it has no built-in detector. 

The fact that it doesn’t offer refunds is also a risk for users who want guaranteed results.

If you want something stronger and more trustworthy, use Undetectable AI. 

It comes with the best AI detector that catches 100% of paraphrased content, a powerful humanizer that beats major detectors, and 24/7 customer support. It gives you everything Grubby AI is missing.

Try Undetectable AI today and see why millions of people trust it as the best AI humanization solution.