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The 6 Best Undetectable.AI Alternatives (for Bypassing AI Detectors)

Undetectable.ai is an incredible tool for rewriting ChatGPT and making it human-readable & able to bypass a majority of AI writing detectors. If you're looking for a replacement, or just another tool to supplement your writing, here's a list of the best alternatives you should test out.
Updated October 13, 2023
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a penguin trumpeting next to a computer

The rise of ChatGPT & AI-generated writing is here. I've been using Undetectable AI since it first came out & absolutely love it.

If you don't want to publish AI-generated content right out of the box, you can throw it into a tool like Undetectable and get a paraphrased result that generally bypasses AI detectors.

It produces solid new paragraphs and is super easy to use. If you want to read exactly how it works, I also wrote up a complete Undetectable AI review with a lot more depth.

As great as this tool is, there are a few alternatives that aim to do the same thing but vary your sentences a little differently.

What Undetectable AI Lacks

While I don't really agree with AI detection since it tends to over predict (and isn't even provable), I think Undetectable can often throw in weird grammar errors to try and offset the overprediction of detectors.

You can change the readability level to be more or less human but I tend to see more grammar errors the more human you try to make it. I've noticed other tools don't have as many as these grammatical errors.

In conducting my own tests, I asked GPT-4 to write me a 500-word article about how to choose the best paraphrasing tools. Then I paraphrased it using six paraphrasing tools and checked the results using the Content at Scale's AI detection tool. Here are the results:

The Best Undetectable AI Competitors & Alternatives

1) HideMyAI

HideMyAI is an AI paraphrasing tool that has extremely similar features to Undetectable. You can also use dropdown menus to select from seven different types of rewriting styles, eight educational levels, and four perspectives.

HideMyAI also gives you a “detection likelihood” from popular AI detectors such as Originality and Content at Scale. It's insane. I also find it to not mess with my grammar & sentence syntax as much as Undetectable – but it really varies.

You can use HideMyAI for free with 300 credits (which is equivalent to 300 words). If you need more, the tool offers a pay-as-you-go system starting at $10 with a 5,000-word limit.

To save money, you can upgrade to the Pro plan that has a 10,000-word limit for only $8.25 a month but I'd highly recommend trying the free version first. It's worth figuring out which tool you like better.

If any of your transformed writing gets detected as AI-detected content, you can get credits back for those generations.

HideMyAI Pros and Cons

PROS

CONS

  • Free trial

  • Very easy to use

  • Affordable

  • Saves output automatically

  • Batch files upload

  • Supports 4 languages (English, French, Russian, and Spanish)

  • Runs on WordPress

  • No free version

  • No extra features

  • Credit Back Gurantee - works on per detected AI content

2) Netus.AI

I used to work with Netus a bit but it seems to be poorly made. It has like 50 different bypassing tools to rewrite. I think it's very unorganized but it's pretty affordable and still gets the job done like Undetectable & HideMyAI.

Now regarding accuracy – that's up in the air. You can read the content and make your own judgement on what you think about it. I just find it kind of weird...

3) Quillbot Paraphraser

Quillbot has been a very popular AI writing tool since its release in 2017. With its additional features including a grammar checker, summarizer, translator, and plagiarism checker, this tool is ideal for educators, essayists, and other writing professionals. No wonder, Quillbot has over 150 million users across the globe as of December 2022.

Quillbot’s paraphrasing tool has a free version with no signing-up required. However, it has a 125-word limit per input and only 2 writing modes. If you want it unlimited, go with the premium plan with a starting price of $19.95 a month. Once doing so, you can also enjoy all its features including the Paraphraser History and Plagiarism Checker.

Quillbot Pros and Cons

PROS

CONS

  • Free Paraphraser (no sign-up required)

  • Very easy to use

  • Colored text output (Depending on variations)

  • Paraphrases 23 different languages

  • Produces high-quality results

  • Chrome extension

  • MS Word Extension

  • Free Paraphraser has low word limit

  • Free Paraphraser has only 2 writing tones

  • No API Access

  • No mobile app

  • 3-day (72 hours) Money Back Guarantee

4) Scribbr Paraphrasing Tool

Founded by two Dutch students in 2012, Scribbr was acquired by Course Hero not too long ago in September 2022. Even though they were acquired, Scribbr is still equipped with various writing tools, including a paid professional proofreading and plagiarism checker.

And like Quillbot, the Scribbr paraphrasing tool is free and has a125-word limit and 2 writing tones. The tool also produces colored text, depending on the variations. The main difference between the two is that Scribbr’s premium plans don’t include the paraphrasing feature. This means that you're always limited to 125 words per input.

Scribbr's Pros and Cons

PROS

CONS

  • Uses Quillbot Paraphraser

  • Free Paraphraser (no sign-up required)

  • Very easy to use

  • Colored text output (Depending on variations)

  • Produces high-quality results

  • Paraphraser has low word limit

  • Free Paraphraser has only 2 writing tones

  • No mobile app

  • Available in English only

  • No Chrome extension

  • No MS Word Extension

5) Paraphraser.io

Paraphraser.io is an AI writing tool founded in January of 2020. This freemium paraphrasing platform also has an article rewriting tool, grammar checker, text summarizer, and plagiarism checker. The paraphrasing tool has 6 writing modes, while the rewriter has 2 rewriting modes. Paraphraser.io also has a WordPress plugin.

With Paraphraser.io, you can rewrite 4 languages and paraphrase 22 languages, including Chinese, Dutch, French, German, Japanese, and Tagalog. The free version of Paraphraser.io has a 500-word limit per input for rewriting and a 600-word limit for paraphrasing. You can increase your word limit to 1500 for only $7 monthly.

How It Works

As you can see, the results from the rewriter and paraphrasing tools had a 99% Human Probability score each.

Paraphraser's Pros and Cons

PROS

CONS

  • Intuitive user interface

  • Free version (no daily limit)

  • Very affordable (1500 words for $7/month)

  • 6-mode selection

  • Highlights changed texts

  • Supports 22 languages

  • Downloadable results

  • Mobile app (iOS and Android)

  • Email and Chat support

  • Free version overloaded with ads

  • No AI detection tool

  • WordPress plugin is not free

  • Paid API Access

  • No rewritten/paraphrased text history

  • No money-back guarantee

6) Rephrase.info

Not to be confused with Rephrase.ai, Rephrase.info has very similar extra features to Paraphraser.io, such as article rewriter, grammar checker, text summarizer, and plagiarism checker. Rephrase.info also offers the same modes but has no WordPress plugin.

Like Paraphraser.io, Rephrase.info can rewrite 4 languages and paraphrase 22 languages, including Chinese, Dutch, French, German, Japanese, and Tagalog. The free version also has a 500-word limit per input for rewriting and a 600-word limit for paraphrasing. You can increase your word limit to 1500 for only $7 weekly or $20/month.

Test Results

As you may have noticed, the rewriter had a 100% score while the paraphrasing tool only scored 83%, which is still good.

Rephrase Pros and Cons

PROS

CONS

  • Intuitive user interface

  • Free version (no daily limit)

  • Very affordable (1500 words for $7/month)

  • 6-mode selection

  • Highlights changed texts

  • Supports 22 languages

  • Downloadable results

  • Mobile app (iOS and Android)

  • Email and Chat support

  • Free version has more ads than Paraphraser

  • No AI detection tool

  • Paid API Access

  • No rewritten/paraphrased text history

  • No money-back guarantee for monthly subscription

  • 15-day money-back guarantee for annual subscription

Which Alternative Should You Use?

After conducting thorough tests, HideMyAI & Quillbot are the crystal clear winners as amy personal favorite alternatives to Undetectable AI. HideMyAI does pretty much the same thing & QuillBot lets you customize & tweak words individually even further.

Scribbr’s paraphrasing tool is equally great in terms of quality. But unfortunately, it's not exactly practical when you're facing a mountain of content to rephrase.

For Paraphraser.io, I’d say the quality is above satisfactory, although the ads in the free version are really eye sore. But while the premium plans are very affordable, the tool has no refund policy. The number of languages it can paraphrase is impressive but I was not able to test them.

Rephraser.info works the same but passed different detectors with a lower score. Plus, the ads in the free version are the worst I have ever encountered in a tool like this. Very annoying.

At the end of the day, picking an Undetectable AI alternative boils down to your specific needs. You should honestly try a bunch of them and see what gives you the most accurate & consistent results.

Remember, even the most sophisticated AI paraphrasing tool can't guarantee to fool all detection mechanisms all the time. There's an aspect of luck & unreliability to this. If you've used any of these & have comments, I would love to hear your thoughts in the comments below!

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Written by Justin Gluska
Justin is the founder of Gold Penguin, a business technology blog that helps people start, grow, and scale their business using AI. The world is changing and he believes it's best to make use of the new technology that is starting to change the world. If it can help you make more money or save you time, he'll write about it!
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