Best Free Alternatives to Grubby AI Humanizer

In 2025, it is virtually impossible to find any form of writing that AI hasn’t influenced in some way, shape, or form. It is probably the best advancement to facilitate writing since the invention of paper. That said, it is glaringly obvious whenever someone uses AI in their writing and our brain picks up on it. Such writing doesn’t help you connect with your audience, and it's not doing you any favors in the SEO

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department. Grubby AI Humanizer is a popular choice to fix that, but it has its limitations. Allow me to present my favorite 5 free alternatives to Grubby AI humanizer that deliver human-sounding text without putting a dent in your wallet.

Why Look Beyond Grubby AI Humanizer?

So why do I feel the need to even write this article in the first place? Grubby AI humanizer does an okay job of producing text bodies that seem personalized, personable, and human-sounding, but it does come with its faults. I’ll go over some of them.

Grubby AI Humanizer’s Limitations:

While researching I noticed that the number 1 problem people have in Grubby AI Humanizer reviews is the fact that it puts additional restrictions on the free version, almost pushing people to get the premium when a lot of people might not want to or find it in their budget to do so.

As said before, it comes with watermarks on any humanized text it generates in the free version, and on top of that, it also instills character limits, not words, CHARACTERS, a quota that can be filled up quite easily. For Grubby AI, that quota seems to be at roughly 500 words, which is barely enough for serious use.

And finally, the primary deciding factor, the output, the humanized text still has a robotic sound to it. It is better than raw AI text, sure, but it is still not “Human” enough, and to get a passable text for your use you have to pay a pretty penny.

If you have to pay for the premium just to get decent results, I must conclude that it is surely not worth it. This is why you must venture outside the options available. I am here to make that search much easier with my list of alternatives.

Key Features in Alternatives

The question is, “What am I looking for in a Humanizer?” To make it simple, I’ve kept 4 key points to measure each option against. These are a few basic demands or expectations that I think all of us should have from our AI Humanizer tools. This is essentially my recipe for the perfect one.

A completely free alternative: I don’t want any costs involved in any shape or form. People (me) have a hundred other subscriptions to pay for. They (again, me) shouldn’t have to worry about another one.

Offers a range of humanization styles: I could do with a little variety in my text. Nothing too complicated, just simple versions/levels like Easy, Medium, and Aggressive.

Enhanced Clarity: Something that makes an AI Humanizer exponentially better would be if it not only makes the text personable, but also way better. I’d like it to significantly enhance the clarity and natural rhythm of AI-generated text.

Enhanced Human-like nature: And finally, the cherry on top would be if it boosts the perceived genuineness and human-like quality of your content.

5 Best Free Alternatives

Now that the expectations are clear, here are 5 tools that I’ve found and tested that meet those expectations to some degree and are free Grubby AI Humanizer Alternatives.

Humanize AI-Toolsmart

Is it even surprising at this point that Toolsmart tops the charts once again? Humanize AI-Toolsmart is an AI tool amongst 50 others that is meant to aid your writing. This particular tool helps achieve that by rephrasing parts of it that are AI-sounding to text that is so human-sounding it is impossible to tell this was an AI Humanizer’s work.

Features

• No watermark or branding: After the experience with Grubby AI, I am sure you will appreciate this feature, NO WATERMARKS. Toolsmart doesn’t feel the need to brand the output it produces, and I have a feeling it’s because they let the quality do the talking on their behalf.

• Unlimited text processing (even long documents): There is absolutely no limit on the amount of text it can process in a single file no matter what the length of the document.

• Easy, Medium, and Aggressive styles: I have a lot of fun controlling the outcomes of a tool, it’s like being a kid with all sorts of different materials and you get to experiment with them, see what action gives you what result in real time. The three styles help me choose how much human-sounding I want the text to be and I can see the changes on my screen almost instantly.

• Batch upload up to 10,000 words: I don’t have to worry about word limits when batch uploading because Humanizer AI-Toolsmart gives me a whopping 10,000 words to work with. That is more than enough for several decent-sized blog posts or articles, which is primarily what I’ll be using it for.

Pros

• 100% free, no trial or sign-up required.

• The output reads naturally and smoothly.

• Great for academic, blog, and social content alike.

• Excellent for ESL users needing clarity and tone improvements.

• Fast response time, even for large documents.

• Doesn’t overwrite your tone, just enhances it.

• Great balance between AI polish and human voice.

Cons

• No downloadable desktop/mobile app yet.

• Works best in English (multilingual support is limited for now).

• Doesn’t offer tone detection, rewrite intensity must be selected manually.

I’ve had great experience with Toolsmart overall, but its Humanizer AI is on another level entirely. I gave it text that I had generated using ChatGPT, and it humanized it so well that the output passed several AI detection tools, not to mention my own colleagues couldn’t tell the difference. The output was smooth, error-free, used simple and clear language, and it gave me options to pick the Humanization intensity. It checked all the boxes, and on top of that, it did it for ABSOLUTELY FREE. There were no annoying pop-ups, ads, or hidden paywalls for any of the features. The only drawback that had any impact at all was the fact that it does not have a desktop app and needs an internet connection to work, but performance-wise, this gets a solid 5/5 from me.

Undetectable AI

Even if I don’t talk about this one, the name practically gives it away. Undetectable AI is an AI tool that is meant to produce text that is virtually, well, undetectable. By undetectable, I mean it should pass AI detection tools like its child's play and if it can do that, it’s almost good enough to fool human eyes.

So much so that even the likes of Forbes, Buzzfeed, and Business Insider have talked about it. It was designed to detect all AI and bypass any AI detector by making the text as human as possible.

Features

• AI detection bypass: It is designed specifically to rewrite content so it avoids being flagged by detectors like GPTZero and Originality.ai. It doesn’t do this by simply avoiding the hall-marks of AI written content, rather, it makes the output quite natural in appearance.

• Rewrites in Human tone: The way this tool functions is very precise. It first scans your text to evaluate its “AI-ness,” then applies targeted humanization to reduce detection scores.

• Real-time scanning for AI traits: With Undetectable AI you get a visual “human score” of your content before and after rewriting to measure how effective the transformation was.

Pros

• Designed specifically for AI detection bypass.

• Helps pass AI plagiarism scanners.

• Strong paraphrasing capabilities.

• Works well for short essays or emails.

• Includes preview of "human score" before download.

Cons

• Limited usage in free trial (few rewrites per day).

• Some rewritten content lacks tone variety.

• Pushes upgrade pop-ups often.

I have used Undetectable AI before, and my experience and opinion about it are pretty much the same as they were before. The simple interface is quite nice I would say, the less complex a tool is to work with the more I can appreciate it because that means there’s no learning curve to use it.

It gave me an exact number of what it calls a “human score” after the alteration to give me an idea of what to expect and I can say with great confidence that the text it provided me with looks human-written, if someone showed it to me I would say “yeap, that’s a person’s thoughts”.

So if it’s that great why is it number 2 on the list? The biggest downside to using it despite the great results and ease of use is the fact that I can only have a couple of rewrites per day in the free trial after which I will have to purchase a premium so it does have a free version, that free version just happens to be very short.

StealthWriter

When I was little, stealth was something I said when pretending to be ninjas with my friends. Now when I say stealth it means an AI Humanizer tool. How the times change. All joke aside, StealthWriter is an AI writing assistant to help improve text quality, enhance readability, and refine content. It’s amongst the top 3 because it emphasizes on the output quality and gives you more control of your tone which is something Undetectable AI isn’t able to do. That is the main reason why it has such a dedicated fan base.

Features

• Humanizes AI text with a focus on AI detection evasion: The main goal here is to help content bypass detection tools while maintaining a conversational tone, and I’d say StealthWriter meets that goal pretty well.

• Offers SEO-safe rewriting options: You can rewrite your text without compromising on SEO which is something a lot of AI tools struggle with. Their main priority is how we can bypass checks, not how we can improve text. StealthWriter doesn’t have that problem.

• Highlights AI scores before and after: You can tell all the ways that StealthWriter has improved the text simply by looking at it, or if you want to be more precise just have a gander at the AI scores for before and after.

• Offers sentence-level rephrasing: You can target and rephrase individual sentences, offering more control over edits compared to full-document tools.

• Allows tone choices like "Professional" or "Casual": You can customize your rewrite style with options like “Professional,” “Casual,” or “Creative,” ideal for marketing or business content.

Pros

• Works well for rewriting emails, descriptions, and micro-copy.

• Decent AI detection evasion.

• Great UI for quick edits.

• Built-in plagiarism checker (in paid version).

• Free plan doesn’t add watermarks.

Cons

• Free plan has low daily limit (~1,000 words/day).

• Sometimes sounds too simplified.

• Not great with technical or academic writing.

I had heard of StealthWriter before but this was my first time actually using it for myself. The user-friendly interface meets the standards I’m comfortable with and to give this a fair shot I paid for the premium version to see what the hype is all about. The plagiarism checker, I felt, was a nice touch.

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It allowed me to make a couple of quick edits to the output and the overall quality of the output is great as well. The downside for this tool, again, are the limitations in the free version which I feel not a lot of new users will take kindly to.

Humanize AI

When you hear Humanize AI, you think the name couldn’t be more on the nose for this one, and frankly, this tool is as simple in operation as its name. You know exactly what you’re in for when you’re using this tool.

What makes this tool different is that despite its minimalist approach it still does a pretty good job of achieving high “human scores”. The developers put their energy into the performance rather than the outlook for this one for sure.

Features

• Basic paste-and-rewrite tool: It is as simple to use as it looks. Drop your text in and get an instant rewrite. There is absolutely no formatting or complicated inputs required, just paste, click, and go.

• Focused on increasing “human score”: The tool aims to raise your text’s likelihood of passing AI detection tools by simplifying structure and changing phrasing.

• Color-coded feedback on sentence simplicity: Sentences are highlighted to indicate which parts are still “AI-like” and which have been effectively humanized.

• Allows one-click rephrasing: A single click gives you a full rewrite, although with limited customization compared to others.

• Browser-based tool with no login required: You don’t have to login, sign-up, or download anything. Just look up Humanizer AI on your browser and start using it hassle-free.

• Shows output similarity to AI content: You can assess the quality of the output quite easily because it literally spells it out for you.

Pros

• Minimalist, fast interface.

• Decent at rewording short paragraphs.

• Easy for beginners to use.

• No watermark in output.

• Works well for general blog or article intros.

Cons

• Limited to 1,000 words.

• Rewrites can be repetitive across inputs.

• Doesn’t adapt well to voice or tone.

If I had to say one thing about this tool is that if it were a person, it would be the most simple, humble person you’d ever meet. As an AI tool however, that’s a bit too much. A lot of people might find the clean outlook very welcoming and I like easy “dumbed-down” operations and interfaces, but I would still like for it to have a little bit of flair.

It’s okay for quick fixes. When I pasted in 3-4 small paragraphs, it gave decent rewrites. But beyond that, it struggled to maintain a natural rhythm. I'd use it only for micro-editing, not full articles.

It gave me a decent output as any and was pretty quick about it. The downside to this tool would be the limitations in the free version, but the most bothersome for me was the repetitiveness for some of the inputs.

Hemingway Editor

No, not the writer, but I wouldn’t blame you for thinking of him when hearing this Humanizer AI tool’s name for the first time. Hemingway Editor pays homage to the actual Hemingway, but like the writer it is mainly focused on English.

It highlights complex sentences, passive voice, and other readability issues, making it a popular choice for bloggers, students, copywriters, and anyone who wants cleaner writing. It’s more of a grammar tool than a rewriting tool, but it still does the Humanizer part well.

Features

• Text clarity checker and readability grader: It marks long or complex sentences in red and yellow, helping you shorten or restructure them for better readability.

• Highlights passive voice, adverbs, and long sentences: The tool flags unnecessary modifiers and passive constructions, helping improve tone and confidence in your writing.

• Assigns readability grade level: Assigns a U.S. school-grade reading level to your text, useful for aligning tone to your audience.

• Gives color-coded feedback for simplicity: Like a teacher highlighting your mistakes, it highlights different sections in different colors for better understanding of what changes were made where.

• Works offline (via desktop version): While the online version is free, you can purchase a desktop version to edit documents without an internet connection.

• Doesn’t rewrite, offers suggestions only: Unlike others, Hemingway gives suggestions but doesn’t rewrite for you, you do the humanizing work based on its feedback, and honestly who would want to do that?

Pros

• Excellent for improving clarity and readability.

• Perfect complement to other AI humanizers.

• Offline access (if you purchase the desktop app).

• Boosts professional and academic tone.

• No watermark or branding.

Cons

• Doesn’t rewrite for you, you have to do the edits.

• Not built to “humanize” AI content directly.

You already know what I’m about to say for this one. It is last on my list because it does a great job with polishing the text and grammar but it does not write for you and that is something I didn’t like. If I’m doing all the work, I’d rather just have a suggestion tool like Grammarly.

It showed me what needed simplifying and that is great for stripping fluff and getting your content clear and readable so I suppose credit where credit is due.

Comparison of the Six Tools

Now that we’ve talked about these tools at length, here is a side-by-side comparison of them all. Take a peek and decide which one you would prefer.

Why Choose Humanize AI-Toolsmart?

Even just looking at the table tells you why Humanize AI-Toolsmart is the top choice for me. It doesn’t just tweak phrases to bypass detection it rewrites entire blocks of content with rhythm, clarity, and makes it sound completely natural while it's at it.

It allows me to upload long documents to rewrite which is something not many humanizer tools do, they prefer you paste sections of your text into the text-box and give you sections in return.

I truly enjoy writing with Toolsmart by my side because I know it will not let me down and won’t even ask for anything in return. It is absolutely free, no paywalls, no ads, no hidden fees, nothing. Does it sound too good to be true? Perhaps, but you have to try it for yourself first to make that judgement and I promise you, it is worth the hype it’s getting.

FAQs

1. Is Toolsmart Humanize AI completely free to use?

Yes, Toolsmart Humanize AI is 100% free with no hidden charges. The great advantage is that, unlike Grubby AI, it offers unlimited text processing without watermarks or word limits.

2. Can I process long documents with Toolsmart Humanize AI?

Yes, Toolsmart supports batch processing of long documents. The useful feature is that you can upload files up to 10,000 words at once, unlike Grubby's 500-word limit.

3. Does Humanize AI-Toolsmart guarantee data security?

Yes, Toolsmart prioritizes privacy. The good thing is, it doesn't store your processed content, and all data transfers use secure encryption for protection.