Best Undetectable AI Alternatives in 2026 to Bypass AI Detectors: Undetectable AI Review

We’ve all been there: It’s tiring, isn’t it? Of course, you want your content to rank well and read easily – but tools like Undetectable.ai often have a hefty price tag, and their performance can be hit or miss.

If you’re here reading this, chances are you’re tired of paying over the odds for something that doesn’t fully deliver on its promise to help you get past AI detectors.

I’ve tested lots of them out – from the big names everybody knows to new kids on the block that are so new, they haven’t made much noise yet!

In this blog post, I’ll take you through the best Undetectable.ai alternatives in 2026 that can help you bypass tough AI text detectors like GPTZero, Originality.ai, Turnitin and Copyleaks.

In this Undetectable AI review, we will discuss pricing, performance, and all the little details that you won’t find on their sales pages.

After reading through it all, you’ll have a clear idea of whether Undetectable.ai can bypass AI detection tools.

What is Undetectable.ai?

Undetectable. ai is currently one of the popular AI writing tools out there to humanize AI text. It markets itself as having two main functions: making text sound more human (humanizing) and also providing an AI detector.

The concept is simple: you take some robotic-sounding text that’s been generated by AI, paste it into the tool, and it will rewrite the text so that it sounds like something a person would write.

It’s an AI detector that isn’t really reliable or accurate, as it provides a lot of false positives when compared to leading AI checkers like GPTZero, Originality.ai and Copyleaks.

Also, you’ll find that the “undetectable” promise doesn’t hold up because it can’t bypass tough AI detectors. And as AI technology improves, Undetectable.ai has become less effective.

Is Undetectable.ai a Free or Paid Humanizer?

I’ll be straight up with you—Undetectable.ai isn’t free. Sure, they might say it is, but it’s hardly usable without paying.

When you register, you’ll receive some free words to try out the tool, but it will be limited to the basic model. Honestly, that’s their best model because the Undetectable mode generates text that is really difficult to read and sometimes makes no sense.

To use Undetectable.ai for anything meaningful, you’ll need to subscribe to a plan—and it ain’t cheap.

Paid plans start at $19 a month for 20,000 words. Want more? That’ll be $31 for 35,000 words. But things really jump when you want up to 50,000 words: this can cost as much as $42. In fact, when it comes to pricing, Undetectable.ai is one of the most expensive AI humanizers around.

A yearly subscription does save 50%, and might seem like a good idea. However, committing yourself to 12 months with a tool that doesn’t really bypass AI detectors that matter is not a good idea.

There are better Undetectable.ai alternatives that do a much better job. In a nutshell, this humanizer is over hyped and overpriced when compared to its competitors.

Can Undetectable.ai bypass GPTZero or Originality AI detector?

There’s no easy way to say this, but the answer is no—it doesn’t. I tested this with the following procedure:

A 300-word paragraph was generated using ChatGPT. It was then ‘humanized’ using Undetectable.ai “More Human” and “Balanced” settings (the best available options). Finally, the humanized output was run through Originality AI and GPTZero.

Unfortunately, the ‘humanized’ text didn’t bypass either detector. It was still clearly identified as AI-generated content by both. The output of Undetectable AI easily gets flagged by top-tier detectors like Originality AI and GPTZero.

I repeated this testing process multiple times with different content, and it was still flagged by GPTZero and Originality AI detectors. I would not recommend relying on Undetectable if you want to bypass AI detectors.

You might also want to read: Best humanizer to bypass Originality.ai in 2026.

How I Vetted These Undetectable AI Alternatives

The list you’re about to see in this Undetectable AI review wasn’t thrown together after a quick Google search for “best Undetectable AI alternatives.”

I used them to rewrite an AI content from ChatGPT, then saw how well each one worked by running their output through Originality.ai and GPTZero.

As well as checking whether they could beat the AI detectors, I also looked at how well the humanized content read.

Was it natural-sounding, or did it use too many synonyms? How much of the original meaning and keywords had been preserved? And what about value for money?

5 Factors to Consider When Choosing an Undetectable.ai Alternative

Before we dive in, let’s look at what you should be considering when evaluating any tool that claims it can make your AI-generated content “undetectable.” In other words, what are your priorities?

1. Bypass Success Rate. If a humanizer can’t avoid AI detection tools like GPTZero or Originality, it’s not worth using—no matter how cheap or easy to use. The number one thing you need is a tool that works.

2. Content Integrity and SEO. No one wants their keywords and important information ripped out of their content or changed beyond recognition.

3. Pricing and Value: How many words are you getting for each dollar spent? Some tools on this list give you very few words unless you upgrade to a pricey monthly subscription, while others provide a very generous allowance even on their least paid plan.

4. User Experience. While this might seem like an afterthought compared to some of the other factors on this list, don’t discount its importance. If you’re spending hours trying to figure out how something works, that’s time you could have spent creating content (or doing just about anything else).

5. Readability. Does the output sound natural and human-like, or is it barely comprehensible?

Best Alternatives to Undetectable.ai in 2026

If you are ready to ditch the overpriced tools and find something that works, here are the top Undetectable.ai alternatives in 2026.

1. ReHumanize AI

When it comes to finding a reliable alternative to Undetectable AI, there is one tool that stands out above all others: ReHumanize AI. Of all the humanizers I have tested, ReHumanize AI is the only one that truly delivers on its claims without using cheap tricks or plain paraphrasing.

Instead, it restructures text so that it reads like something written by a human being.

Here are some reasons why ReHumanize AI is the best alternative to Undetectable.ai

Bypasses major detectors

This is the most important thing – and ReHumanize AI does it better than any other tool. When I tested it against GPTZero, Originality, Copyleaks and Turnitin, it consistently bypassed these detectors. The content doesn’t just scrape through as authentic (whatever that means) – ReHumanize makes it look authentic.

SEO Preservation

When it comes to content creation, SEO is essential. Unlike many other AI humanizing tools, ReHumanize AI preserves your important keywords so that you can rank higher. Some AI humanizers try to bypass detectors by replacing all your keywords with similar terms.

This can wreck an otherwise solid SEO strategy. ReHumanize AI knows better—it keeps most of your keywords intact. It also has advanced SEO tools like a grammar checker and ReadBreeze, which is very similar to Hemingway, but even better in several key ways.

Maintaining Content Quality

We’ve all seen articles ruined by humanizers because the result often reads like nonsense. That’s because these tools pay little attention to quality writing. This isn’t something you need to worry about with ReHumanize AI. You won’t get strange phrasing or incomplete sentences, just high-quality text that sounds like it was written by a human.

Free Rewrite Loop

Other AI Humanizers remove words as you re-run text to improve it. But ReHumanize AI won’t deduct from your word count on repeated runs. If you’re not totally satisfied with the first output, feel free to run it again – as many times as you like, for no extra charge. Many tools force users to burn through their word limits rapidly if they want to try again after being disappointed initially. With our tool, though, that will never be a worry.

What does this mean for you? Well, you don’t have to pay separate subscriptions to Grammarly for editing or proofreading! You get all of that using the tool.

Here is the result of the text written with Rehumanize AI when checked on GPTZero and Originality AI: 

ReHumanize Pricing

ReHumanize AI has made sure there’s an option for everyone when it comes to pricing, whether you’re a freelancer, writer, or agency.

For $9, you can get the Starter Plan, which allows up to 25,000 words – ideal if you only need to use the humanizer now and then. If you’re likely to be a heavy user because you have multiple clients (or websites), consider the $18 Standard Plan with a limit of 50,000 words.

Then there’s the Pro Plan costing $30 that gives you 85,000 words monthly. Furthermore, annual subscriptions come with a 40% discount compared to paying monthly. There is also a Forever Free plan, which caps monthly usage at 700 words, but could be enough for those wanting to test the tool out before committing.

It has three writing styles (casual, conversational, and formal) to choose from, alongside a clean editor and format options.

Pros and Cons of ReHumanize AI

Pros:

• Consistently bypasses Originality AI, GPTZero, Copyleaks, etc.

• Maintains SEO keywords flawlessly.

• Produces content that is indistinguishable from human writing in terms of quality.

• Comes with a built-in grammar checker and ReadBreeze.

• Starting at just $9, it is very affordable.

• Has a clean, expertly designed interface that offers various tones.

Cons:

• No unlimited word plan available.

• The free plan is limited to 700 words per month.

2. Humanizeai.pro

If you Google “AI humanizer” right now, there’s a good chance this tool will be one of the top results – because it’s ranked highly for that search term.

But does it really humanize AI? Yes – but only to a point.

For example, if you want to get past detectors like Copyleaks, Grammarly detector, Quillbot and ZeroGPT, it does a pretty good job. These basic detectors can often be tricked by simple changes to a sentence’s structure, which Humanize AI is quite good at.

However, if you were hoping to bypass industry-leading detectors like GPTZero or OriginalityAI, then forget it.

After testing Humanize AI against Originality AI, we found that the former could not outsmart the latter. When I used the tool to rewrite two 300-word AI-generated texts, the output was still easily flagged by GPTZero and Originality AI.

Humanizeai.pro depends mainly on paraphrasing strategies, which more advanced detectors like GPTZero can see right through.

When you sign up for an account, you get a 1500-word free trial to test out the tool. It’s not a free monthly plan; once you exhaust the 1500 words, that’s it.

They have a feature called Ultra Run, which supposedly enables users to evade all AI detectors— but this feature does not work as advertised.

Another thing worth noting is that Humanizeai.pro has an AI detector in addition to its AI humanizer. I tested out the AI detector as well, comparing its performance against top AI detectors like Copyleaks and GPTZero. Its detector is not something you want to rely on.

Screenshot of the text when rewritten with Humanizeai.pro:

Below is the result when checked on GPTZero and Originality.ai

Humaizeai.pro Pricing

In terms of pricing options, Humanize AI has three paid-for plans:

• Lite Plan: $19 each month covers 20,000 words.

• Standard Plan: Pay $29 per month and get up to 50,000 words.

• Pro Plan: For 150,000 words every month, you’ll need to stump up $79.

Pros and Cons of Humanize AI

Pros:

It can bypass Copyleaks and other mid-tier AI detectors

Many different writing styles are available.

Cons:

• It easily gets flagged by GPTZero and Originality AI

• It’s not cheap, given what it can’t always do.

• There is no free tier beyond a one-time trial.

• The built-in AI detector is not reliable

• Even when set to “Run Ultra,” it still can’t bypass GPTZero and Originality AI.

Related blog: Best TwainGPT alternatives to bypass all AI checkers.

3. GPTHuman.ai

GPTHuman.ai presents itself as cutting-edge AI technology for humanizing text – but how well does it really work?

In addition to a humanizer, the tool suite boasts an AI content detector, article spinner and generator, plus a paraphraser. While there is an AI-detector included, don’t put too much trust in it: It isn’t nearly as reliable as GPTZero or Originality AI detectors.

When it comes specifically to using the humanizer, there are four tone options available. This can be helpful if you need your output to be read at a certain academic grade.

There are also three different writing-style settings: professional, balanced, and enhanced.

If I were to give you one piece of advice, it would be this: steer clear of the ‘enhanced’ mode. Text produced in this fashion can be difficult to read or completely nonsensical at the worst. In an effort to outsmart detectors, too many words are needlessly beefed up.

The result? Clunky text that reads unnaturally (as if a robot had chewed over every verb). On a positive note, there’s nothing complicated about using GPTHuman. Your words appear on a plain white screen – simple as that.

GPTHuman Output:

Result of our GPTHuman output when checked on Originality and GPTZero:

GPTHuman Pricing

GPTHuman has three payment tiers:

• Starter Plan: $15 for up to 25,000 words
• Plus Plan: $25 for up to 60,000 words
• Unlimited Plan: $49 flat rate

Pros and Cons of GPTHuman.ai

Pros:

• If you’re after unlimited use, this could be the package for you

• It also offers an article generator and a paraphraser

Cons:

• Text generated in ‘Enhanced’ mode can be of poor quality

• Its AI detector is nowhere near reliable

• GPTHuman easily gets flagged by GPTZero and Originality.ai

• It’s a bit expensive, considering the tool’s performance

4. AskYourPDF

As more people cotton on to the wonders of AI copywriting, lots are also discovering humanizers. So, when a brand such as AskYourPDF gets into the picture as well, it’s not a surprise.

AskYourPDF humanizer is very user-friendly. By default, the options for intent, readability, and human level are already on default.

Honestly, I don’t think a lot of effort was put into building this humanizer, because it’s more of a good rephrasing tool like Quilbot.

Still, compared to the tools I’ve reviewed, like Undetectable.ai, it doesn’t bypass GPTZero or Originality AI content detectors. It also sometimes struggles to bypass Copyleaks.

So while it’s great for simple detectors, you don’t want to use it if you need to avoid getting flagged by more advanced detectors.

AskYourPDF Output result:

Originality and GPTZero text result:

AskYourPDF Pricing

There are two paid plans.

• Premium Plan: $14. 99 each month. You can humanize up to 4,000 words daily.

• Pro Plan: $19. 99 each month. You can humanize up to 15,000 words daily.

Pros and Cons of AskYourPDF

Pros:

• Very user-friendly, featuring a basic interface.

• Users receive ample daily word allocations when choosing the Pro subscription plan.

Cons:

• Limited customization options compared to rivals.

• Not a dedicated humanizer; feels like an add-on feature.

• It can’t bypass GPTZero and Originality.ai detectors

• No built-in grammar checker.

• The AI detector is not reliable.

Conclusion: Undetectable AI Review

We’ve now looked at numerous Undetectable.ai alternatives, each one unique in its own way and useful depending on your exact requirements.

Whatever your reasons for needing an alternative, you want something more affordable and capable of bypassing detectors better than Undetectable.ai does—particularly when it comes to beating Originality AI and GPTZero.

Out of all the tools we’ve considered here, ReHumanize AI provides by far the best blend of performance and value for money.

Its ability to produce content that’s both 100% humanlike and SEO-friendly makes it an attractive option if you want your content not to get flagged by AI checkers.

Simply put, if you need articles or other written material that can’t be detected as AI-generated (even when checked on advanced detectors), then look into ReHumanize AI: it’s one tool that delivers!

Frequently Asked Questions on Best Alternatives to Undetectable AI

What is the best Undetectable AI alternative?

ReHumanize AI. This is because it manages to beat both GPTZero and Originality AI for detection while also preserving your original meaning and SEO keywords.

Can Undetectable.ai bypass GPTZero?

No, it can’t! In our testing, we found that although Undetectable.ai managed to beat some basic detectors, advanced AI detection software such as GPTZero was still able to identify its output as being written by a machine.

Can Undetectable AI bypass Originality?

No, it can’t. If you want something that can evade Originality (as well as GPTZero), consider ReHumanize AI instead—it does a much better job at creating undetectable content!