GPTZero

What it does

GPTZero accepts pasted text or uploaded documents and returns an estimate of how much of the writing is likely AI-generated, with highlighted sentences showing where those signals appear. It also checks writing quality and plagiarism. In Google Docs or the GPTZero dashboard, it can record a document's writing history and produce a Writing Report with a playback of edits, a typing-pattern analysis, callouts for large pastes, and an Investigate chat grounded in that edit history.

Teachers, students, publishers, recruiters, and marketers use it to check drafts and review how a document was produced. Its distinguishing feature is the replay: reviewers can watch a session compressed into a short clip and see large pastes marked on a timeline, rather than relying on a score alone. The company says it supports English, German, Portuguese, French, and Spanish most strongly.

Best suited to educators and organizations that want detection alongside process evidence. Access is through the web app, a Chrome extension, and an API, and scans over 10,000 characters require a free account. Team plans require a minimum of two seats and card payment, with invoicing handled through sales. The company advises that results are not a final verdict and that accuracy is lower for short text and non-English writing.

What it can do

• Detect AI-generated text from models such as ChatGPT, Claude, and Gemini
• Highlight sentences likely written by AI
• Check writing quality and grammar with feedback
• Detect plagiarism against outside sources
• Record and replay document writing history with a typing-pattern analysis
• Ask an Investigate chat about a document's writing history

Works with

• Google Docs
• Google Classroom
• Canvas
• Zapier
• API

Before you choose

• Detection results are estimates and should not be treated as proof of authorship or used alone for disciplinary decisions.
• Writing Replay requires the supported editor or extension and records only the writing activity it can observe.

Listed under

• Productivity
• Writing and docs
• AI detection
• API
• Chrome extension
• Education
• Plagiarism
• Teachers

Get started

Paste text to scan directly; create a free account for scans over 10,000 characters.

1. Paste text or upload a document on the web app and press Scan.
2. Add the Chrome extension from the Chrome Web Store to use it inside Google Docs.
3. Turn on the Writing Replay setting in the GPTZero dashboard to record sessions in other editors.

Team plans are card-payment only; purchase orders and invoicing go through sales. Each seat includes 500,000 words per member per month.

Source: gptzero.me/pricing, checked 29 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 29 Oct 2026. Each source supports part of the overview; availability and prices can change.

• AI Detector - Free AI Checker for ChatGPT, GPT-6 & Gemini ↗gptzero.me
• Pricing ↗gptzero.me
• GPTZero Authorship: Writing Replay for Google Docs and Beyond ↗gptzero.me

Company website

gptzero.me: product, pricing and policy pages

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Last checked 29 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.