ZeroGPT Review (2025): Free AI Detection or Just False Positives?

ZeroGPT Review: A Free AI Detector, But Is It Accurate or Unreliable?

3.0/5

Overview

ZeroGPT emerged in 2023 as one of the most widely used free AI detectors, offering a simple interface for users to quickly check text for AI-generated content. Its core technology, "DeepAnalyse," aims to identify text from major language models, including the latest versions like GPT-5. The platform is versatile, providing not just AI detection but also built-in plagiarism and paraphrasing tools. With features like sentence highlighting, PDF report generation, and API access for integration, it targets a broad audience, from students and educators to bloggers and content creators.

However, despite its popularity, ZeroGPT suffers from the same critical flaw as many of its competitors: a significant problem with reliability and false positives. While it can be effective at flagging purely AI-generated text, it frequently misidentifies human-written content, especially academic, cited, or formally structured text, as being created by AI. Its accuracy drops considerably on shorter texts, and users report wildly inconsistent results, sometimes flagging historical documents or even the Bible as AI-written. Because of this inconsistency, ZeroGPT should be treated as a preliminary screening tool at best. It is not reliable enough to be used as a definitive authority for making high-stakes decisions, such as those involving academic integrity.

Key Features

Sentence Highlighting

Highlights the exact sentences that are most likely to be AI-generated, providing a visual breakdown of the text.

Plagiarism & Paraphraser Tools

Includes built-in tools to check for plagiarism and help paraphrase text, offering an all-in-one writing assistant.

DeepAnalyse™ Technology

Utilizes its proprietary technology to detect content from the latest AI models, including GPT-4 and GPT-5.

API & Chatbot Integration

Offers API access for integrating its detection capabilities into other applications and chatbots.

Pricing Plans

Plan	Price	Features
PRO	$9.99 /month	Ad-free experience 100,000 Characters per AI detection 50 Batch files check for AI detection Generate PDF report for AI detection History of all detections 2,000 Prompts in ZeroCHAT-4 750 Words in Plagiarism Checker (One-time) Access Advanced Summarizer & Paraphraser
PLUS	$19.99 /month	Ad-free experience 100,000 Characters per AI detection 60 Batch files check for AI detection Generate PDF report for AI detection History of all detections 2,000 Prompts in ZeroCHAT-4 25,000 Words in Plagiarism Checker per month Access Advanced Summarizer & Paraphraser
MAX	$26.99 /month	Ad-free experience 150,000 Characters per AI detection 75 Batch files check for AI detection Generate PDF report for AI detection History of all detections 3,500 Prompts in ZeroCHAT-5 40,000 Words in Plagiarism Checker per month Access ZeroGPT on Whatsapp and Telegram

Use Cases

For Content Authenticity Checks

Used by bloggers and content creators to perform quick, initial checks on articles to ensure originality before publishing.

For Preliminary Academic Screening

A first-pass tool for educators to quickly screen student essays for obvious AI-generated content.

For Quick Text Verification

A free, accessible tool for general users to run a quick check on any piece of text they are curious about.

Pros and Cons

Pros

Claims high accuracy in detecting content from major AI models like GPT-4 and GPT-5.
Supports batch file uploads and provides downloadable PDF reports of the analysis.
Offers multilingual detection capabilities, trained on a wide range of languages.

Cons

Frequently produces false positives, incorrectly flagging human-written text as AI.
Considered unreliable by many users due to inconsistent probability scores.
Its accuracy significantly decreases on short texts (under 500 words).
Advanced features and higher usage limits are locked behind a paid API.

Frequently Asked Questions

Why did ZeroGPT flag my original essay as AI-generated?

This is a common issue. ZeroGPT, like many AI detectors, often struggles with formally structured, cited, or technical human writing, leading to a high rate of false positives.

How accurate is ZeroGPT on short pieces of text?

Its accuracy drops significantly on texts under 500 words. It is less reliable for checking short paragraphs, emails, or social media posts.

Is ZeroGPT completely free to use?

The basic web tool is free for general use with some limitations. However, for higher volume, batch processing, and integrations, you need to use their paid API.

How can I verify if a ZeroGPT result is a false positive?

The best practice is to not rely on a single test. Run the text through multiple different AI detectors and use your own judgment. If the writing is for an assignment, having drafts and sources ready can help prove authorship.

Is ZeroGPT better than GPTZero?

Both tools suffer from similar issues with false positives on human text. Users report that GPTZero often provides more detailed reports, while ZeroGPT sometimes misses AI content that other tools catch.

Alex Carter, Content Strategist

Aug. 17, 2025, 3:15 p.m.

Unreliable and Prone to False Accusations

I found ZeroGPT to be more problematic than helpful. In my tests, it consistently flagged original, human-written content as being AI-generated, sometimes with a high probability score. This unreliability makes it dangerous to use in any professional or academic setting, as it could lead to false accusations of plagiarism or cheating. While the interface is simple, the core technology is flawed and overly aggressive. It seems to create more problems than it solves, and I cannot recommend it for anyone who needs accurate, trustworthy AI detection.