AI Tool

GPTZero Review

GPTZero is an AI detection platform designed to identify AI-generated text, providing granular insights and sentence-level AI probability scores.

shipped Jul 5, 2026image-generationpaid

Domain rating80Monthly visits7.9M/mo

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Why it matters

1GPTZero offers a free tier and paid plans at $12.99/month (Premium) and $24.99/month (Professional).

2The platform includes an API with usage pricing at $0.00004297/word.

3GPTZero has scanned over 1 billion documents and serves over 10 million users worldwide as of January 2026.

4It supports integrations with Google Docs, Canvas, and Zapier.

About GPTZero

Usage Pricing

$0.00004297/word per words

Founded

2023

Platforms

Web, Chrome Extension

Target Audience

Educators, Students, Publishers, Recruiters

Pricing Plans

Free

$0 / monthly

• 10,000 words per month
• Basic AI Scan
• 3 Free Advanced Scans
• 5 Free AI Highlights in Chrome Extension

Premium

$12.99/ month

• 300,000 words per month
• Advanced AI Scan
• Multilingual AI detection
• Download AI reports

Professional

$24.99/ month

• 500,000 words per month
• All of Premium
• Up to 2 million words overage
• Scan up to 250 files at once

Cost Examples

• Scan 10,000 words: Free
• Scan up to 300,000 words: $12.99/month
• Scan up to 500,000 words: $24.99/month

Specs

API Docs

View Documentation →

API Available

Yes, public API

overview

What is GPTZero?

GPTZero is an AI detection tool developed by GPTZero that enables educators, publishers, and content creators to identify AI-generated text. It provides granular insights, including sentence-level AI probability scores, to assist in content verification across various writing styles. The platform's core capability is distinguishing between human-written and AI-generated content, utilizing deep learning and analyzing linguistic and stylistic features. Initially relying on perplexity and burstiness, GPTZero transitioned to an end-to-end deep learning classifier in autumn 2023. Beyond AI detection, it offers features such as a Hallucination Detector, Plagiarism Checker, Grammar Check, and an AI Vocabulary tool.

features

Key Features of GPTZero

GPTZero provides a comprehensive suite of tools for content verification, focusing on identifying AI-generated text and ensuring content integrity. Its features are designed to offer detailed analysis and support various professional and academic needs.

AI Detector: Identifies text generated by large language models (LLMs) like ChatGPT, GPT-4, Gemini, Claude, and LLaMA.
Sentence-level AI Probability Scores: Provides granular insights into the likelihood of individual sentences being AI-generated.
Advanced AI Scan: Offers detailed analysis of AI probabilities across a document.
Hallucination Detector: Identifies fabricated citations and sources within text.
Plagiarism Checker: Detects external content plagiarism.
AI Vocabulary Tool: Helps identify words commonly used by AI models.
Grammar Check: Assists in correcting grammatical errors.
99% Accuracy: Claims high accuracy in detecting AI-generated text, particularly for educators and students.
Supports Multiple AI Models: Compatible with various advanced LLMs.

use cases

Who Should Use GPTZero?

GPTZero is primarily utilized by individuals and organizations requiring robust AI content verification and authenticity checks across diverse text types. Its capabilities are tailored for academic, professional, and content creation environments.

Educators and Students: For verifying the authenticity of student submissions, ensuring academic honesty, and combating AI-generated cheating.
Publishers and Content Creators: For authenticating manuscripts, articles, blogs, and social media posts to ensure originality and prevent AI-generated content.
Employers and Recruiters: For checking the originality of job applications, cover letters, and writing samples in hiring processes.
Legal Professionals: For verifying the originality and integrity of legal documents for compliance and authenticity.
Marketers and Businesses: For ensuring content created for marketing campaigns and websites is original and not AI-generated, maintaining brand credibility.

how to use

How to Use GPTZero

To use GPTZero, users typically navigate to the platform's website or utilize its API to submit text for analysis. The process involves uploading or pasting content and then reviewing the generated report.

1Access the GPTZero platform via its website (gptzero.me) or integrate its API into an existing system.
2Paste or upload the text document you wish to analyze into the designated input area.
3Initiate the AI detection scan.
4Review the results, which include an overall AI probability score and sentence-level highlighting.
5Utilize additional features like the Hallucination Detector or Plagiarism Checker as needed.
6Interpret the report to determine the likelihood of AI generation, plagiarism, or fabricated content.

pricing

GPTZero Pricing & Plans

GPTZero offers a freemium model with a free tier and two paid subscription plans: Premium and Professional. An API is also available with usage-based pricing. The paid plans provide increased word limits and access to advanced features.

Free: $0 per month, includes basic AI detection for limited word counts (e.g., scan 10,000 words).
Premium: $12.99 per month (billed annually), allows scanning up to 300,000 words per month and access to advanced features.
Professional: $24.99 per month (billed annually), allows scanning up to 500,000 words per month and includes all features.
API Usage Pricing: $0.00004297 per word for programmatic access, with rate limits advised to be handled gracefully.

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Pros

+Provides granular sentence-level AI probability scores for detailed analysis.
+Includes a dedicated Hallucination Detector to identify fabricated citations and sources.
+Offers a Plagiarism Checker and AI Vocabulary tool alongside AI detection.
+Claims high accuracy (~99%) in detecting AI-generated text, particularly for academic use.
+Supports an API for programmatic integration and offers a free tier for basic usage.
+Partnerships with educational institutions like the American Federation of Teachers.

Cons

−Users report a significant false positive rate, flagging human-written content as AI-generated.
−Studies indicate potential misclassification of non-native English essays as AI-generated.
−Some users criticize slow customer service and expensive subscription lock-ins.
−May struggle to keep pace with the rapid advancements of newer AI technologies.
−Specific numerical API rate limits are not publicly detailed, requiring users to implement graceful handling.

Policies

Pricing Page

View Pricing→

Similar Tools

GPTZero vs Competitors

GPTZero operates in a competitive landscape of AI detection tools, distinguishing itself through its granular analysis and specific features like hallucination detection. It is often compared against other platforms that offer AI content verification.

Originality.aiOn Stork

It offers a comprehensive suite including AI detection, plagiarism checking, and readability analysis, specifically targeting content publishers and web publishers.

Originality.ai is often cited for its high accuracy in detecting AI-generated content, similar to GPTZero, but it operates on a credit-based system which might be more cost-effective for infrequent users. It also includes a plagiarism checker and readability score, which GPTZero offers as separate features.

Writer AI Content Detector↗

It provides a simple, free-to-use tool for detecting AI-generated text, integrated into a broader writing platform.

While GPTZero offers more granular, sentence-level analysis and additional features like hallucination detection, Writer's AI Content Detector is a straightforward and completely free option for quick checks. You give up the advanced analytical depth for ease of access and no cost.

Content at Scale AI Detector↗

This tool is designed to identify AI-generated content with a focus on distinguishing between human and machine writing, often used by content creators.

Similar to Writer's free tool, Content at Scale's detector is a good free alternative for basic AI detection. It may not offer the same level of detailed probability scores or additional features like plagiarism and hallucination detection that GPTZero provides, but it serves the core purpose of identifying AI text without cost.

Sapling AI Content Detector↗

It provides a free online tool to check if text was written by an AI, with a focus on ease of use and quick results.

Sapling offers a free and accessible AI content detector, making it a direct free alternative for basic detection needs. While it lacks the advanced features and detailed reporting of GPTZero, such as sentence-level analysis and hallucination detection, it fulfills the primary job of identifying AI-generated text without any cost.