What Is StealthGPT? The #1 Undetectable AI Humanizer Explained
StealthGPT is the most reliable AI humanizer available. It rewrites AI-generated text so it passes Turnitin, GPTZero, Originality.ai, and every major AI detector. In this guide you'll find exactly how it works, who it's built for, independent test results across five detectors, and how to get started free.
TL;DR
StealthGPT is popular for its unbeatable ability to help users avoid AI content detection, but it can also be used to write, edit, and check content for AI. It's used by students and teachers at various levels, freelance writers, and anyone who needs to write, check, or bypass AI content.
Table of Contents
What Is StealthGPT?
StealthGPT is an AI-powered content writing assistant that can perform multiple tasks. It's an AI bypasser, AI checker, and content writer rolled into one. StealthGPT has grown to become popular since it was launched, and its popularity is largely due to how it claims to be capable of avoiding AI detection by all AI detectors including TurnItIn.
What Is StealthGPT for?
StealthGPT can be used for writing AI content, detecting AI content, and bypassing AI content. As a multipurpose tool, it's the Swiss army knife of the AI content writing industry.
Here's an overview of how to use StealthGPT.
Writing Content with StealthGPT
To generate AI content on StealthGPT, open Stealth Writer. Type your query into the chat bar and click “send.” Stealth Writer is excellent at writing short-form content. Here's a screenshot of the Chat with Stealth interface.
If you want to write something longer, like an essay, Stealth Agent. Write the topic of your essay, the tone and style of the essay, a thesis statement, and an outline if you have one. Then, click “generate.” Here's what Stealth Agent looks like. Stealth Agent can draft your entire essay in one go; utilizing high quality research and citing in-text sources.
Detecting AI Content with StealthGPT
StealthGPT’s AI checker works like other AI content detection software. You paste the content inside the AI checker and click “analyze.” StealthGPT will scan the content and let you know the chances that it was human-written or AI-generated. Here's a screenshot of the AI checker.
Our AI checker can detect content generated by AI writing tools built on a wide range of models, models such as: GPT-5, Claude, Gemini, Llama 4, and DeepSeek. Regardless of which model generated your text, StealthGPT's AI checker is built to detect and humanize output from all of them. This means that no matter which AI writing tool is used to generate text, that text can't evade StealthGPT's AI checker.
Bypassing AI Content Detection with StealthGPT
StealthGPT is the best software for avoiding AI detection. To experience the peace that comes with humanizing AI content using StealthGPT, open the AI Humanizer, paste the AI content and click “Generate.” StealthGPT will humanize the AI content. Here's a screenshot of the Bypass tool.
StealthGPT can humanize any kind of AI content, including essays, blog posts, emails, messages, term papers, research projects, etc.
Who Uses StealthGPT?
Anyone who needs any AI content written or needs to make content undetectable may use StealthGPT. The software can also be used by anyone that needs to check if content was written with the aid of AI. This includes teachers, students, content writers, copywriters, technical writers, script writers, ghost writers, editors, etc.
How We Tested StealthGPT
Although StealthGPT has many features and use cases, we focused on testing StealthGPT's ability to bypass AI detection. In conducting this test, we first generated content with an AI writing tool. We humanized or paraphrased the content using StealthGPT. After this, we scanned the content using AI detectors to see if they could tell that the content had been rephrased with an AI software.
If, according to the test results, the AI detector could pick up a strong AI trail in the content, then it meant that StealthGPT couldn't bypass that AI detector. If the opposite were the case, then our claim regarding StealthGPT's prowess at avoiding the AI detector would be true.
Which AI Detectors Are We Testing It Against?
For this test, we selected five of the best AI content detection tools: Winston AI, Originality.ai, Conch AI, Content at Scale, and Copyleaks. In case you aren't familiar with these tools yet, read their descriptions below to know more about them.
Originality.ai
Originality.ai is the king of AI content detectors. Although it sometimes struggles with misidentifying human content if the content is written in a neutral and straightforward tone and is free of grammatical errors, it excels at AI detection almost 100% of the time. Since we didn't use human-written content in this test, Originality.ai’s misidentification of human writing wouldn't affect the test results.
Conch AI
Conch AI has substantial active users who're happy with the quality of services that they receive from Conch. One of those services is AI content detection. While Conch AI isn't primarily known for its AI checker, this checker is pretty smart. In the past, we've scanned AI-generated text (not text humanized with StealthGPT) with Conch AI and it successfully identified them as AI-written.
Content at Scale
Content at Scale's AI detection feature is trained on text found in blog posts, articles, and Wikipedia pages. It's trusted by freelance writers and professors worldwide, who collectively scan millions of words with it every month.
Copyleaks
Copyleaks is a software that's used for plagiarism checks and AI detection. Large organizations such as Semrush and Medium trust the efficacy of Copyleaks. Their commitment to using Copyleaks is proof that the app is at least a wizard at AI detection.
Winston AI
On the official Winston AI website, Winston AI is described as the leading AI detection tool. According to online reviews of the AI detector, this claim is true. Originality.ai, a competing software, also attests to Winston AI's high content detection accuracy. Independent testers such as ddiy.co reviewed Winston AI and agreed with the general perception of Winston AI as a difficult-to-bypass AI detector.
Test Results
It wouldn't be fair if we showed you the test results without presenting proof of us following the steps for the test, would it? In this section, we'll disclose how we followed the procedure for testing these AI detectors.
Step 1: Generate AI Content
All of the AI detectors that we tested could detect ChatGPT content. With that in mind, we used ChatGPT to generate an essay about how to brew coffee. Here's a screenshot of the article.
Please read it carefully so that you can be sure that we didn't swap it for a human-written essay later.
Step 2: Input Text into StealthGPT
We opened the AI Humanizer and pasted the ChatGPT article into the tool. Here's a screenshot of the text pasted in StealthGPT.
As you can see, we didn't edit the text at all. Even the hashtags and asterisks that ChatGPT usually includes in text while generating text were left intact.
After pasting the text, we click the purple arrow button and begin the humanizing process. See the screenshot of the humanized text below.
StealthGPT took less than two minutes to finish humanizing the content. The Stealth score of the content, which indicated how difficult it'd be for AI detectors to correctly identify the text, was 94.
Based on this score, we expected the AI detectors that we tested to give the content a human score of at least 94. In AI detection, a human score is the probability, expressed as a percentage or a whole number, that text was human-written. Therefore, a human score of 94 means that there's an 94% chance that the content was human-written.
Step 3: Testing Against AI Detectors
Originality.ai
We first scanned the content on the standard 2.0 model of Originality.ai. The 2.0 model is much smarter than Turbo 3.0.2. Unlike 3.0, which is so sensitive that it can claim that a human-written article is 100% AI-generated, 2.0 yields more accurate results.
After Originality.ai scanned the text, the AI results showed that the content had a human score of 97%. This means that Originality.ai believed that there was a 97% chance that text humanized with StealthGPT had been written by a human. This score is even higher than what StealthGPT predicted that the text would score on AI detectors. Here's a screenshot of the result.
Conch AI
Conch AI scored the text humanized with StealthGPT an 87 out of 100. Put differently, Conch AI was confident that there was an 87% probability that the content rephrased with StealthGPT was human-written. This score is lower than what StealthGPT predicted, but it's still an excellent score.
Check the screenshot of the test result below.
Content at Scale
Content at Scale's AI detector doesn't award scores after checking the text for AI. Rather, it tells you whether the text passes as human or not. After reviewing the essay humanized with StealthGPT, Content at Scale was positive that the text passed as human text.
See the screenshot below.
Copyleaks
Like Content at Scale, Copyleaks determines whether it is AI or Human but does also provide a numerical scores. When it's evaluated text, it reports that “This is human text” if it believes that the text was written by a human. If it's confident that the text is AI-generated, it states, “This is AI text.” After evaluating the text that StealthGPT paraphrased, Content at Scale reported that the text was human text. StealthGPT received a perfect score.
Here's the screenshot.
Winston AI
Winston AI gave the text paraphrased with StealthGPT a 99% human score, indicating that it believed that 99% of the text was human-written while other parts were written with AI. An excellent score like this one implies that you can bypass Winston AI using StealthGPT.
Below is a screenshot of the result.
BONUS - GPTZero
As a bonus round we decided to run a test against the best of the best, the 2026 model in GPTZero. Being the toughest detector out there, StealthGPT passed with flying colors at solid 75%. See the screenshot below.
What Do These Results Tell Us?
AI detectors assigned StealthGPT's humanized content up to a 97% probability of being human-written. While detector results shouldn't be treated as definitive, their terms of service say as much, most instructors and clients rely on them heavily in practice. Consistently passing at these rates means StealthGPT gives you the best available protection against false positives and detection penalties.
Conclusion
Whether you need to humanize AI-generated essays, blog posts, or professional content, StealthGPT gives you the tools to do it cleanly, across every major detector.
Every subscription tier unlocks the full feature set: Stealth Agent, AI Humanizer, Stealth Writer, AI Checker, and more. StealthGPT offers weekly, monthly, and annual flexible payment options to get you access to the best undetectable AI tools in 2026.
Getting started is free. No credit card required. For best results, StealthGPT's humanization guide walks you through getting the most out of each generation.
