6,622 tools, each one opened, scored and signed by a Toolio reviewer

Gpt Zero

Free AI detector for writers.

Checked 3 Oct 2026 Reviewed by Alex Listed since July 2024

Screenshot of Gpt Zero

At a glance

Starts at Free, Upgrade to Premium $19/month Price as published by the vendor, September 2026.
Free tier Yes, limited
Platforms Web
Best for Writers, educators, content creators
Not for Content creators on tight budgets

4.0 out of 5

Scored by Alex after real use

Our verdict

GPTZero is highly accurate and useful for detecting AI-generated text. It's best suited for writers and educators who need reliable detection tools but may struggle with its higher price point or lack of some advanced features found in premium plans.

✓What it does well

High accuracy99.9% accurate in classifying AI vs human text.
Wide model supportDetects from ChatGPT to Gemini and Llama.
Detailed insightsProvides sentence-by-sentence detection and advanced report analysis.

✕Where it falls short

Free plan limitationsLimited features in the free version.
Higher costPremium plans can be expensive for some users.
No video replay in basic modeBasic plan does not offer video replay and human writing verification.

Key features

Plagiarism detectionCan scan text to check for plagiarism, but as a separate feature.
AI tutor toolOffers AI-powered feedback on writing habits and skills.
API accessProvides an API with code available in multiple languages for integration.
Video ReplayProvides video proof of writing process.

Questions about Gpt Zero

How accurate is Gpt Zero?

The reviewer calls Gpt Zero highly accurate for detecting AI-generated text and credits it with 99.9% accuracy in classifying AI versus human writing. It detects text from models ranging from ChatGPT to Gemini and Llama, and it offers sentence-by-sentence detection with advanced report analysis.

Is Gpt Zero free?

Gpt Zero has a limited free tier, and users can upgrade to Premium for $19/month, as published by the vendor in September 2026. The reviewer notes the free version has limited features and that premium plans can be expensive for some users.

What can Gpt Zero do besides AI detection?

Gpt Zero can scan text for plagiarism as a separate feature, and an AI tutor tool gives feedback on writing habits and skills. Video Replay provides video proof of the writing process, and an API with code in multiple languages supports integration. The basic plan does not include video replay or human writing verification.

Who is Gpt Zero for?

Toolio recommends Gpt Zero for writers, educators and content creators who need reliable AI detection. It is not for content creators on tight budgets, since the reviewer finds its price point higher and notes that some advanced features sit in premium plans.

How does Toolio rate Gpt Zero?

Alex scored Gpt Zero 4.0 out of 5 after real use, on 3 Oct 2026. Gpt Zero runs on the web and has been listed on Toolio since July 2024. Alternatives Toolio lists include Sider AI, CoWriter AI and AI Writing Keyboard TypeGenius.

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