The Top 5 Best Undetectable AI Writers of 2025

Blog, Undetectable AI

The Top 5 Best Undetectable AI Writers of 2025

As we enter February of the new year, the cream of the crop in undetectable AI have all had the chance to showcase their new capabilities and either drive innovation in this space, or trail behind the pack trying to mimic what makes the top tools so effective.

In this comprehensive AI review, we’ll run through some of our picks for the best undetectable AI writing tools available and test them against a slate of AI detection systems to show you our thought process.

We considered many factors when judging the best AI writing tool, including how human-like the AI-generated content is, the text’s readability, its ability to bypass AI detection tools, the customization options, SEO optimization, key features, advanced features, functionality, "is the writing plagiarism-free?", "how's the free trial?", pricing, and more.

Basically all the things that amount to an easy, user-friendly experience to make high quality human-like content with an AI chatbot.

Table of Contents

  • Ranking The Top 5

  • Reviewing The Top 5

  • Conclusion

Ranking The Top 5

Lets get right to our results before diving into the gnitty-gritty details of how we got these rankings. Based on first-hand experience, countless tests, and how much fun each tool is to run, this is the official StealthGPT ranking for best undetectable AI writers of 2025:

1. StealthGPT

2. Hix Bypass

3. BypassGPT

4. Humbot

5. Stealthwriter

There might be some surprises on this list, however, it’s not about which tool ranks on search engines first, it’s about which gives content creators the best writing assistant, and without a doubt, number one is still StealthGPT.

For the value of its pricing packages, power of the algorithm, ability to bypass AI checkers, customization options, SEO optimization capabilities, and the quality of the human writing.

Reviewing The Top 5

Using a variety of data, lets check out each individual AI writer and compare what we’ve found:

StealthGPT

Below is a graph detailing our results from using StealthGPT outputs against a wide variety of AI detectors such as Turnitin, Originality.ai, GPTZero, Winston AI, ZeroGPT, Crossplag, Scribbr, and Quillbot:

The overwhelming response from these scans is the determination that StealthGPT’s outputs are of human origin. Against Turnitin, the most popular AI detector that’s built into academic submission portals like Blackboard and Canvas, StealthGPT showed a perfect score of 0% AI.

StealthGPT is an All-in-one undetectable tool for any content creators needs whether they’re a blogger or student. This toolkit includes an SEO writer for optimizing content writing workflows, an AI humanizer, a Stealthwriter, two kinds of AI detectors, and study simulators. All these features also include a wide variety of customization options for tone, writing style, stealthiness, length, and purpose.

StealthGPT’s advanced algorithm is able to produce the content for any specific goal whether its professional, academic, casual, for high school, college, or PHD level assignments.

Pricing

StealthGPT’s unbeatable AI tools come at unbeatable value. With pricing packages that make this software accessible for anyone, StealthGPT also includes a free trial with unlimited word counts as well as staircase pricing to reward customer loyalty.

Each package is assembled for versatility, so casual users, professionals, or students can unlock their content generation potential.

Hix Bypass

Hix is one of the more popular undetectable AI writers people might recognize scouring the internet for the AI rewriter that suits them. Below, this graph of Hix’s results against the same cross-section of detectors answers " does Hix generate high-quality content?"

Although able to bypass Turnitin with the same ease as StealthGPT, Hix’s human-like text wasn’t human enough to beat other detectors a moderator might employ to double-check their analysis. If a user really wants to secure their content, Hix might not be the best software, it does however bypass Turnitin effectively.

With a clunky, complicated user interface, Hix offers numerous tools that seemingly all offer the same humanization process. By compartmentalizing content generation into a wide variety of tools, they do their users a disservice that detracts from an easy navigation experience.

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Pricing

Hix has competitive pricing for casual users but a lackluster free trial program if you want to give the software a spin. With results that leave users high and dry against many detectors, professionals and academics should consider other options.

You get what you pay for with Hix, it works some of the time but there’s never a guarantee your professor or moderator won’t put in the effort to look beyond Turnitin.

BypassGPT

Some might be surprised to see Bypass GPT on this list but credit where credit is due. If you only use AI writing casually and for free, BypassGPT isn’t the worst option. For more serious submissions though, users ought to consider the testing data we’ve consolidated in the graph below:

BypassGPT isn’t undetectable enough to secure a user from plagiarism accusations, but if you need casual humanized content for free, it’ll at least be able to bypass ZeroGPT and Crossplag, two free AI detectors.

Pricing

BypassGPT has upgrade options to lure people that may have used their free humanizer with some success, but committing to any undetectable AI system requires some research if you want your money to pay for positive results.

We’ve done the research and can give you some expert advice: Just don’t.

Humbot

Humbot, like many other undetectable AI services, gears its algorithm for one specific duty: bypassing Turnitin. We can tell as much through their test results featured below:

If users can read their professor's mind and know they won’t use any detection software other than Turnitin, then perhaps Humbot is usable in those instances. In every other case, in which a professor will diligently commit to investigating plagiarism, which is almost always the case, Humbot leave a lot to be desired.

Pricing

If the only detector a user wants their content to bypass is Turnitin, these are Humbot’s pricing options:

Decently priced packages for people that use AI casually can't promise you won't get caught with AI plagiarism accusations.

Stealthwriter

If we were grading StealthGPT’s feature “Stealth Writer”, readers would be treated with data to backup our claims of superiority over other AI writers. Unfortunately, Stealthwriter is also a separate software altogether with results that differ quite dramatically from StealthGPT’s tool of the same name.

Here’s Stealthwriter’s results when tested across numerous AI detectors:

Like many other services we’ve seen, Stealthwriter only excels at beating Turnitin, which is not the full scope of content detection. It’s a lazy tool, offering a great deal of vulnerability to users that put their confidence in it. Still though, beating Turnitin makes Stealthwriter land in our number 5 spot.

Pricing

Stealthwriter's variety of price plans aim to "ninja" users out of a full undetectable experience. Their free version isn’t very useful with its word limit and low functionality while their higher priced plans don’t offer the power, nor perks, to make each price-point worth it.

There’s only one true Stealth Writer and it’s part of a better package than anything we’re seeing above.

Conclusion

StealthGPT is the only undetectable AI that can guarantee users protection from every AI detector that moderators and professors may attempt to use against their submission.

If anyone really cares about the work they’re doing and the outcomes that come from submitting that work, StealthGPT is the only safe and effective option. Luckily for everyone, it is the most accesible tool in the undetectable space, giving everyone the chance to experience undetectability without any caveats.

Join the thousands of StealthGPT users today and get a leg up on the new year by becoming the best content creator you can be.

Written By

Rob Shepyer

Rob Shepyer

Undetectable AI, The Ultimate AI Bypasser & Humanizer

Humanize your AI-written essays, papers, and content with the only AI rephraser that beats Turnitin.