Ellen Cibula
Written by Ellen Cibula Payments, Finance, and AI Expert: Learn More

Are you interested in learning how to pass off your AI content as human with AI detectors?

When ChatGPT come on the scene, people were using it to write content for social media posts, blog posts, and essays. You’re not alone! In fact, 85.1% of AI users use it to create blog content. But will that content pass as human-written?

Using my experience as a blogger and freelance writer, I discovered the four best undetectable AI tools for people interested in bypassing detection from AI systems. I tested out each of these tools on the same text to make sure they worked effectively.

Keep reading to learn about the 4 Best Undetectable AI Tools to Bypass AI Detectors!

Best overall


Undetectable AI logo
  • Rewrites text to bypass AI detection tools
  • Ability to select readability level
  • Option to select writing purpose
  • Balance writing between readability and human-like
  • Watermark and future proof
Best for long-form content

Content at Scale

Content at Scale logo
  • Automatically generate high-quality content that includes external links
  • Create up to 3,000 words in minutes
  • Generates SEO-optimized content
  • Undetectable AI-generated content

Read Review


Here is my list of the 4 best undetectable AI tools:

1. Undetectable AI
2. Content at Scale
3. WordAI
4. Quillbot

This site is supported by its readers. If you purchase through a link on my site, I may earn a commission. For more information see my Disclosure Policy

What Are the Best Undetectable AI Tools?

Here is my reviewed list of the best Undetectable AI tools.

best overall
Undetectable AI logo
We create truly [undetectable] AI content

Undetectable AI

Undetectable AI turns your content that AI detectors have flagged as AI into high-quality writing. This allows you to take AI-generated content and bypass AI detectors. The result? Writing that cannot be distinguished from human writing.

Undetectable AI works on content generated by ChatGPT, Copy.AI, Jasper, and other similar AI generator tools.

The content rewritten by Undetectable is watermark- and future proof, so you can rest assured that any content you use will continue to bypass AI content detectors. They also guarantee that the content generated will not be flagged as AI content – if it does get flagged, you get your credits returned.

Undetectable markets their tool to creative and marketing professionals (like Freelancers). Undetectable does not condone or support using their tool for dishonesty or cheating in an academic environment. Sorry kids, you need to write your own essays and not rely on AI tools to generate your content.

For B2B customers, Undetectable offers an Authorship Replication tool that replicates an author’s writing style, voice, and tone. This allows you to create content that mimics your or your client’s brand voice.

Top Benefits

  • Bypass AI detection tools so you can use AI-generated content without worrying about it being flagged as AI
  • Ability to select readability level (High School, University, Doctorate, Journalist, and Marketing) so you can match your reader’s level
  • Option to select writing purpose (General Writing, Essay, Article, Marketing Material, Story, Cover letter, Report, Business Material, and Legal Material) so your content matches your intended purpose
  • Ability to balance writing between readability, human-like, or balanced to ensure that the content is undetectable against even the most aggressive content detectors
  • Works on all types of AI-generated content, no matter which tool generated it
  • Watermark and future proof, meaning that it will work when AI content has a content

Undetectable AI Pros

  • Watermark and future proof
  • Options to select readability level and writing purpose
  • API access for early adopter testing
  • Created undetectable content

Undetectable AI Cons

  • Can become pricey if you need to generate a lot of content

Ellen’s Test

I then used Undetectable.ai to rewrite this content. Here are the results of my test.

Test text rewritten by Undetectable AI
Undetectable AI test text detected by Content at Scale as 100% human
Undetectable AI test text detected by Originality as 98% human

Once I ran this text through this tool, I then checked it with both Content at Scale and Originality. C@S showed it as 100% human-written, and Originality showed it as 98% human-written. Both excellent scores.


Undetectable pricing

Undetectable AI has 2 pricing models based on your subscription billing period – monthly or annual. Both models are based on the number of words you need to generate per month.

The Monthly Plan ranges from $9.99/month for 10,000 words/month ($119.88/year) to $209/month for 380,000 words/month ($2508/year). There is a sliding scale to select your plan based on the monthly credits you need.

The Yearly Plan ranges from $5.00/month for 10,000 words/month (yearly cost $60) to $104.42/month for 380,000 words/month (yearly cost $1253.00). The annual plan is 50% off (so you basically get 6 months free), but you get charged the annual fee upfront. Again, there is a sliding scale to select your number of monthly credits.

With both plans, the more words, the greater your discount.

They also have a business plan in which you can buy bulk credits with no monthly expiration. You need to contact Undetectable to receive this plan.

With these monthly and annual plans, you get email customer support; with the Business plan, you get priority customer support.

Bottom Line: Ellen’s Take

I highly recommend Undetectable AI. It is the best of the AI rewriter tools.

Honestly, Undetectable AI was the only rewriting tool that passed AI detection right out of the box.

If you are really concerned with your content being flagged as AI, then you need to try out Undetectable AI. As my tests showed, it really works!

best for long-form content
Content at Scale logo
Publish high-ranking content…instantly

Content at Scale

Although Content at Scale is not a rewriter tool, it is one of the best AI content-writing tools that will generate content that passes as not AI-written content. It creates long-form content for both businesses and individuals. It uses 3 AI engines, natural language processing, and other tools to write SEO-optimized blog posts that are high-quality.

Content at Scale creates high-quality content for your blog posts with the click of a single button. You can use a keyword, URL, or YouTube video for Content at Scale to create the content. In just a few minutes, you will have an SEO-optimized article with compelling content.

With Content at Scale, you can improve your content creation process and scale your blog post output.

Top Benefits

  • Automatically generate high-quality content that includes external links
  • Create up to 3,000 words in minutes
  • Generates SEO-optimized content
  • Undetectable AI-generated content

Content at Scale Pros

  • Great for informational content
  • Quick content generation
  • AI-driven SEO optimization
  • Scalable content production

Content at Scale Cons

  • May be pricey for smaller companies
  • Limited creative control
  • Less tailored content

Ellen’s Test

I could not replicate the same test I used above because the concept of Content at Scale is different than the other Undetectable AI tools. However, I can show an article that was generated by Content at Scale and how this article rates on the content detection tools.

This article was before I edited it to make it more human, so it shows the content right out of the box, without any human editing.

Here are my results:

Content at Scale test text detected by Content at Scale - 100% human
Content at Scale test text detected by Originality

This article showed as 100% human on C@S’s content detector; Originality showed it as 59% original. I am not surprised that C@S’s detector showed its own article as 100% human – it uses this AI engine as it writes the articles. As far as Originality, I have tested my own writing and had it flagged as AI – so I take anything that is above 50% human as good enough.


Content at Scale pricing options

Content at Scale has 4 pricing options: Solo, Starter, Scaling, and Agency.

  • Solo: $250/month for 8 articles ($31/post)
  • Starter: $500/month for 20 articles ($25/post)
  • Scaling: $1000/month for 50 articles ($20/post)
  • Agency: $1500/month for 100 articles ($15/post)

Yes, these prices are high. However, think about how much a writer costs you – could you hire a writer cheaper than these costs?

Bottom Line: Ellen’s Take

I can recommend Content at Scale as a good tool if you need content that reads human-like. Although it is expensive, you can get many more articles cheaper than you could have if you hired a writer.

best for paragraph rewrites
WordAI logo
Pass AI Content Detection


WordAI humanizes your content by improving its quality and allowing it to pass as human in AI detectors.

It uses advanced machine learning models to deliver high-quality rewrites. This includes complete sentence restructuring and phrase-level rewriting.

WordAI’s unique feature is its ability to create nested loops, which can produce up to 1,000 unique, high-quality rewrites at a time. The focus is on delivering content that appears high quality to both algorithms and human readers, aiming to engage audiences and rank well in SEO.

WordAI will take AI-generated content from Jasper, ChatGPT, Writesonic, Article Forge, and Copy.AI, run it through its algorithms, and return content that reads as more human. According to WordAI, this rewritten content will bypass AI content detectors (more on this later).

Top Benefits

  • Both Text Rewriter and Avoid AI Detection tools are included, so you can rewrite text and run it through the software to rewrite it to avoid AI detection
  • Plagiarism-free content: each rewrite is unique, so there is no duplicate content or plagiarism
  • Content is naturally readable to humans, helping your content rank higher on search engines

WordAI Pros

  • 3-day trial
  • 30-day no risk money back guarantee
  • API access available
  • Bulk rewrite content

WordAI Cons

  • Did not create content that avoided AI detection
  • Can be pricey for lots of content
  • English-only content

Ellen’s Test

Using the same snippet of text generated by ChatGPT, I had WordAI rewrite it using the Avoid AI Detection tool. Here are the results of the test snippet after I passed through the Originality and C@S content detectors.

WordAI test text rewritten with less changes
WordAI rewritten with less changes, detected by Content at Scale - 100% AI
WordAI test text rewritten with less changes, detected with Originality - 100% AI

So the first test I ran used the “Change Less” setting on the slider on the Avoid AI Detection tool. This version of the rewrite showed as 100% AI on both detectors.

Then I set it to “Change More” and rewrote it. Still, the content was flagged as 100% AI on both tools.

WordAI test text, rewritten with more changes
WordAI test text, rewritten with more changes, detected by Content at Scale - 100% AI
WordAI test text, rewritten with more changes, detected with Originality - 100% AI

So I rewrote the paragraph with the Rewrite Articles tools and then ran it through the Avoid AI Detection tool. But again, it showed as 100% AI on both tools (although with slightly less red results).


WordAI pricing table

Word AI has 3 plans – Starter, Power, and Enterprise. These plans can be billed monthly or annually. You can save 47% on the annual plan.

The Starter plan lets you rewrite up to 50,000 words/month. It is $17/month billed monthly ($204/year) and $9/month annually ($108/year). The Starter plan includes content that passes AI detection, an AI-powered rewriter, human-quality content, one-click rewriting, the ability to pass Copyscape, sentence and phrase level rewriting, bulk article rewriting, and API access.

The Power plan has the same features as the Starter plan, but you can rewrite up to 3,000,000 words monthly. It is $57/month when billed monthly ($684/year) or $27/month billed annually ($324/year).

The Custom plan is perfect for those who need high-volume usage; it includes the same features as the standard plans, plus high-volume usage, increased throughput, white-labeled integrations, multiple user accounts, customized rewrites, heightened quality, and a dedicated account manager. Contact WordAI if you are interested in the custom plan.

Bottom Line: Ellen’s Take

While WordAI is a decent paragraph rewriter tool, I cannot recommend their Avoid AI Detection tool. In my test, it just didn’t work.

best for paraphrasing
QuillBot logo
Save time and write with confidence


QuillBot is an AI-powered rewriting tool that offers services like grammar checking, paraphrasing, and summarizing. It aims to help students and professionals cut their writing time by more than half. Once users input text, QuillBot provides suggestions for improving the clarity and conciseness of the writing.

It’s not just a grammar and spelling checker but also a tool that can reword and restructure selected text, functioning like a full-sentence thesaurus. For these purposes, Quillbot can be used to make AI text undetectable.

Top Benefits

  • Paraphrasing tool for rewriting paragraphs (free tool)
  • Plagiarism checker to verify that your writing is not plagiarized
  • Grammar checker so you can ensure your content is free from grammatical errors
  • Co-Writer tool, an all-in-one writing space for all Quillbot tools, including researching capabilities, note-taking, and AI-assisted autocomplete (free tool)
  • Summarizing tool to summarize text (free tool)
  • Citation generation tools for APA and MLA citations
  • Translator tool to and from multiple (23) languages, with auto-language detection

Quillbot Pros

  • Excellent grammar and paragraph rewriter tool
  • User-friendly interface
  • Versatile tool, as it has several built-in tools
  • Multi-language support
  • Multi-platform support: any browser, Google Docs, Microsoft Word
  • Extensions for Chrome, Word, and macOS

Quillbot Cons

  • Did not create undetectable content.
  • Limited free options
  • Character limitations in both Basic and Premium plans
  • Limited use of paraphrasing

Ellen’s Test

Test text rewritten with Quillbot
Test text rewritten with Quillbot, detected with Content at Scale, 100% AI
Test text rewritten with Quillbot, detected with Originality

For this test, I used Quillbot’s Paraphrasing tool. I took that same paragraph, ran it through the tool, and then checked it with both detection tools. Both flagged the results as 100% AI.


Quillbot Pricing Plans

Quillbot has 2 plans — Basic and Premium.

Basic: The Basic plan is free, but it is very limited. It includes:

  • 125 words in the Paraphraser
  • Standard and Fluency modes
  • 3 synonym options
  • 1 Freeze word or phrase
  • 1200 words in the Summarizer

Premium: The Premium plan is, well, a premium version of the Basic plan. It has more features:

  • Unlimited words in the Paraphraser
  • Standard, Fluency, Expand, Shorten, Formal, Simple, and Creative modes
  • 4 synonym options
  • Unlimited Freeze words and phrases
  • 6000 words in the Summarizer
  • Faster processing speeds
  • Advance grammar rewrites
  • Compare modes (Desktop only)
  • Plagiarism checker (scan up to 20 pages per month)
  • Tone detection
  • Paraphraser history

There are 3 billing options for the Premium plan – Annual, Semi-Annual, and Monthly.

  • Annual plan: $99.95 every 12 months ($8.33/month)
  • Semi-Annual: $79.95 every 6 months ($13.33/month)
  • Monthly: $19.95/month

Quillbot has a 100% money-back guarantee. They will refund your payment within 3 days of purchase. If you need a break, you can pause your subscription.

Bottom Line: Ellen’s Take

Again, while Quillbot is a decent paraphrasing tool, it didn’t rewrite the content in a way to avoid AI detection. I do not recommend it for this purpose.

Test Method

I generated a sample paragraph using ChatGPT. I used both Originality.AI and Content at Scale’s free AI content detector to check the “AI content” before and after rewriting it.

Both tools flagged the content as 100% AI written.

Original test text detected with Content at Scale: 100% AI
Original test text detected by Originality - 100% AI

What is an Undetectable AI Tool?

An undetectable AI tool is a tool that will rewrite AI text to read as more human, allowing that content to bypass tools that detect AI writing.

AI-generated content works on probabilities – in an incomplete sentence, what are the chances of the next word? These detectors score content based on these probabilities.

AI content is also very formulaic and repetitive. It uses a standard format when generating the content and includes words and phrases repetitively. It also consists of an intro, middle, and conclusion – almost every time. Often, you will see words like “firstly, then, lastly” sprinkled throughout the paragraph. In my experience, these generators often use uncommon words that hardly anyone uses (like “delve”). These characteristics are easy for detectors (and some humans) to see.

However, we humans are imperfect. We don’t follow these strict rules when we write. We vary our sentences – both structure and length. We use different synonyms than predicted. Depending on the content type, we may be more informal than content from an AI tool.

These undetectable AI tools base their rewrites on these human traits. They will rewrite the existing content to vary sentence structure, add bullet points, use different synonyms, and change words based on the probability that an AI tool would have used that word.


I hope this list of undetectable AI tools shows you that there are ways to bypass content detection tools. The clear winners in this battle are Undetectable.ai and Content at Scale.

However, I still suggest you edit the content to check all facts, adjust the formatting and tone to match your style, and ensure that it engages your readers. After all, if your readers don’t like your content, why are you writing it?


AI content can be “watermarked” in a few ways to ensure its origin and protect its copyright. Here are some methods:

  1. Metadata Tagging: Similar to how digital images are watermarked, AI content could include metadata tags that identify the creator or owner of the content. This information is embedded in the content and can be read by certain software.
  2. Blockchain Technology: Blockchain technology can create a decentralized ledger of AI text. Each piece of content can be timestamped and linked back to its creator, providing a clear and immutable record of ownership.
  3. Steganography: In this method, an invisible watermark is embedded into the content. This can be a unique code or pattern detected with the right tools but is otherwise not noticeable. Some tools may use cryptographic marks to watermark the content as AI-generated.
  4. Digital Signatures: Digital signatures can be used to sign AI content. The signature, which is unique to the creator and the content, verifies the authenticity and integrity of the content.
  5. Unique Identifiers: AI writing can also be assigned a unique identifier or code. This code can then be registered in a database alongside information about the content’s creator and creation date.

These methods are still developing, and their effectiveness may vary.

Yes, AI-generated text can be detected. Various tools and techniques have been developed to identify text produced by artificial intelligence.

Some tools scan text and highlight words based on their probability of being AI-generated.

There are also methods for identifying AI-generated text without specialized tools. For example, repeating words and phrases is often a telltale sign of AI-generated content.

However, it’s worth noting that while these methods can help identify AI-generated text, they may not catch all instances, especially as AI writing technology continues to improve.

Yes, Quillbot has a limited Basic plan that is free. With this plan, you can rewrite up to 125 words with the Paraphraser tool.

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