GPTZero
GPTZero detects AI-generated text from ChatGPT, GPT-4, Gemini and others, providing probability scores, sentence highlights, plagiarism checks, and a free 10,000-words/month tier for educators and teams.
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Key Features
Seven-component analysis
Perplexity, burstiness, GPTZeroX, education module, web search, Shield and deep learning for detection.
Probability reports
Confidence ratings and probability scores with highlighted AI sentences for quick review.
Plagiarism checker
Paid internet-text scans to identify copied content alongside AI detection.
Grammar & vocab checks
Grammar and AI-vocabulary analysis to surface AI-like wording and errors.
Writing feedback
Automated suggestions and improvements available in higher-tier plans.
Chrome extension
Detect AI directly on web pages with both free and paid extension options.
Bulk scanning
Process up to 250 files at once on Professional plans for long documents and batches.
Developer API
API available in 17 languages for integration into custom workflows and LMS.
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Why Choose GPTZero
Education-focused design:
Trained on student work and tailored tools for educators, with a free 10k words/month tier.Transparent benchmarking:
Public APIs and regular updates with independent test comparisons and benchmarked results.Scalable for teams:
Enterprise plans provide bulk scanning, shared credits and unified billing for organizations.Multi-tool suite:
Combines detection, plagiarism, grammar, feedback and Shield features in one platform.
Pricing
Free: 10,000 words/month basic scans. Essential: $8.33/mo (annual) — 150,000 words. Premium: $12.99/mo (annual) — 300,000 words. Professional: $24.99/mo (annual) — 500,000 words. Enterprise: custom pricing. Annual billing saves ~45%.
About GPTZero
GPTZero detects AI-generated text from ChatGPT, GPT-4, Gemini and others, providing probability scores, sentence highlights, plagiarism checks, and a free 10,000-words/month tier for educators and teams.
What GPTZero Does
GPTZero scans text to detect AI generation and returns probability scores, confidence levels, and highlighted AI-like sentences so users can quickly assess authenticity. It supports documents, PDFs, OCR for images, and web pages via a Chrome extension.
The platform applies seven analysis components—perplexity, burstiness, GPTZeroX, an education module, internet text search, GPTZero Shield and deep-learning models—plus reporting tools, grammar checks, plagiarism detection (paid), writing feedback, bulk scanning and a developer API.
Use cases include classroom integrity checks, journalistic verification, HR screening of applicant text, and enterprise bulk scanning with LMS integration and team collaboration features.
Pros & Cons
Easy to use
Simple interface and quick detection workflow praised in user reviews.
Strong free tier
Generous 10,000 words/month free plan suitable for students and teachers.
High claimed accuracy
Benchmarks report up to ~99% accuracy on pure AI text.
Comprehensive extras
Includes plagiarism, grammar, feedback and API capabilities beyond detection.
False positives
Users report inconsistent accuracy and false positives with mixed human–AI content.
Limited free capacity
Free tier caps at 10,000 words/month, requiring upgrades for heavier use.
Upsells
Frequent upgrade prompts and advanced features gated behind paid plans.
Frequently Asked Questions
GPTZero's free plan allows up to 10,000 words per month with basic AI scans, limited advanced scans, multilingual detection and access to the Chrome extension.
GPTZero claims up to 99% accuracy on pure AI-generated text and around 96.5% on mixed content, though user reviews report variability and occasional false positives.
GPTZero offers monthly and annual billing with about 45% savings on annual plans; Professional, Premium and Enterprise/Team tiers include shared credits and unified billing options.
GPTZero includes a Chrome extension, LMS integrations on Professional+ plans, and a developer API with code examples in 17 languages like Node.js and Python.
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