Getting flagged by AI checkers can mess up your assignments, even if you're just using AI to help.

If you're a student trying to make your writing pass AI detection tools, you’re not alone. Grubby AI is one tool people use to fix this, but it has its limits.

AI humanizers are useful because they help rewrite AI-generated text to sound more natural and avoid detection by AI checkers.

In this article, we'll list the 7 best free Grubby AI alternatives you can use to humanize text and improve your writing in 2025. Let's dive in!

What is Grubby AI?

Grubby AI Humanizer is an AI humanizer that rewrites text to avoid detection by AI detection tools. Students often use it to make ChatGPT writing sound more natural.

It’s designed to change the tone, sentence structure, and vocabulary of AI-generated text. This helps lower the chances of getting flagged by AI detection software.

What Does Grubby AI Do?

Grubby AI takes text and rewrites it in a way that sounds more human. Here are a few of the primary use cases:

• Humanizing text (making it sound more natural)
• Checking/proofreading with AI (checking for mistakes)
• Rewriting (writing new versions of text according to your requirements)

The main goal is to fool AI checkers so the writing passes as human-written. It’s especially useful for students submitting AI-assisted work. It doesn’t write essays for you but helps you rewrite them.

Is Grubby AI Free?

Grubby AI offers a free plan, but it has limits on word count. To get a higher word count, you have to upgrade to a paid plan.

If you’re looking for unlimited or more flexible options, you might want to try a different Grubby AI alternative.

Things to Look for in Grubby AI Alternatives

If you're using a tool to rewrite AI-generated text, there are a few things you should look for. The right Grubby AI alternative can help you sound more natural and avoid getting flagged.

Here are a few things to look for in Grubby AI alternatives:

• Use it anywhere - Go for tools that work across websites so you don’t have to switch tabs or copy-paste constantly.

• Avoid getting flagged - The tool should actually help you lower your AI score on popular detection checkers.

• Sound like yourself - The rewritten text should still match your voice and not feel robotic or off.

• Get feedback on your text - Some tools give a score or flag risky sections so you know what to fix.

• Stick to your budget - Free or low-cost tools are great if you’re using them often or just for school.

Choosing the right tool helps you stay under the radar while still turning in solid work. These features make the process smoother and less stressful.

7 Best Free Grubby AI Alternatives in 2025

Grubby AI isn’t the only option for making AI text sound more human. If you’re trying to avoid getting flagged by detection tools, these options can help rewrite and check your work in different ways.

Here's our list of the 7 best free Grubby AI alternatives in 2025:

AI Blaze

First up on our list of the best free AI humanizer tools is AI Blaze.

AI Blaze is your personal AI writing assistant that helps you proofread your writing, check for AI detection, and rewrite your text to humanize it and eliminate grammatical errors.

With AI Blaze, you can write essays/papers and check them for mistakes, structure issues, and content suggestions anywhere you work using AI!

Features

• Proofread your writing with AI - AI Blaze helps you fix mistakes, check for AI detection, and identify areas for improvement.

• Humanize your writing with AI - AI Blaze can humanize your writing, rewrite it to make it bypass AI detection, and improve your writing anywhere online.

• Summarize any text, image, article, or PDF - Generate notes, citations, and summaries on any website with AI.

• AI Blaze works on any website - Improve writing and humanize text on any website!

Price

• AI Blaze is free! - Forget about annoying licenses or subscriptions

Undetectable AI

Undetectable AI rewrites text to reduce its AI detection score. You paste in your content, and the tool gives you a version that sounds more like a real person wrote it.

Tools like Undetectable AI are often used to help content pass AI checkers used in schools and online platforms. The tool also includes a built-in detection test, so you can check your results instantly.

Price

• Offers a free trial, then paid plans that offer more usage start at $19/month.

Walter Writes AI

Walter Writes AI gives you multiple rewrite versions so you can choose the one that sounds most natural.

You can copy and paste AI text in, then compare outputs side by side. This makes it easier to decide which version fits your writing style.

Price

• Offers a starter trial, then requires a paid plan: Starter ($10/month), Pro ($19/month), Unlimited ($56/month).

StealthWriter AI

StealthWriter AI focuses on helping students rewrite flagged text quickly. You paste in the original version, and it gives you a revised version that aims to pass common detection tools.

Tools like StealthWriter also provide a comparison between the two versions, so you can see what changed. The tool is minimal and doesn’t require much explanation, which makes it good for fast fixes.

Price

• Offers a free plan, then requires an upgrade for more words. The Basic plan is $20/month.

Humbot AI

Humbot AI does more than just rewrite text—it also highlights which parts of your writing are likely to get flagged. This is useful if you want to learn what looks “too AI” and adjust those sections.

After you paste in your content, it gives suggestions and rewrites for the risky areas. The tool’s feedback helps you improve the overall tone of your writing, not just the flagged parts.

Price

• One time purchase of 2,000 words for $9.99. You can also choose the Basic plan ($11/99/month) which offers 3,000 words.

Phrasly AI

Phrasly AI gives you multiple options for rewriting, ranging from small edits to full sentence rewording. It’s helpful when you want to keep the main idea but change the structure enough to avoid detection.

You can also see a detection score after editing, which helps you track your progress. The tool is browser-based and doesn’t require a login.

Price

• Offers a free plan with limitations. The Unlimited plan is $19.99/month.

StealthGPT

StealthGPT is built specifically to help users rewrite text that’s been flagged by AI detectors. You can control how human you want the final version to sound before generating the rewrite.

Humanizers like StealthGPT are designed to handle both short answers and longer essays. Some features are locked to paid users, but the free tier includes basic rewrites and testing.

Price

• The Essential plan is $24.99/month and the Pro plan is $34.99/month.

Prompts to Use With AI Humanizers & Checkers

Using the right prompt can make a big difference when you're trying to rewrite AI-generated text.

These prompts are designed to help students avoid detection, keep a natural tone, and get feedback on their writing. You can paste these into any AI tool to get better, more human-like results.

Here are a few prompts you can use with AI humanizers and checkers:

• Rewrite this text so it sounds like it was written by a real student and is less likely to be flagged by AI detectors.

• Rephrase this paragraph to make it sound more casual and natural while keeping the meaning the same.

• Check this text and point out any sentences that are likely to get flagged as AI-written.

• Edit this response to sound more like a human wrote it without changing the original message too much.

• Rewrite this essay so it sounds personal and reflective, like something a college student would turn in.

• Review this short answer and fix any lines that might trigger AI detection tools.

• Change the tone of this writing to sound more conversational and less robotic, but keep the structure.

These prompts help guide AI tools to produce better rewrites and give you a better shot at avoiding detection.

Avoid Getting Flagged Again

Using a Grubby AI alternative can save you from getting flagged and help your writing sound more natural.

The tools listed above are all free and made for students who just want to fix their text without jumping through hoops.

Whether you’re rewriting essays or checking short answers, using the right AI humanizer can make a big difference.

To recap, our suggestion for the best free Grubby AI alternative is AI Blaze. AI Blaze is your personal AI writing assistant that helps you humanize text, make it bypass AI detection, and improve your writing on any website for free.