GPTZero

What GPTZero does

• AI Detector. Detects text generated by ChatGPT, Claude, Gemini and similar models.
• Hallucination Detector. Checks text for fabricated or unsupported claims.
• Writing Replay. Authorship tool that shows how a document was written over time.
• Chrome extension. Runs automatic AI detection on Gmail, Google Docs, Classroom and social media.
• API. Integrates the AI detector into other platforms, with code samples in 17 languages.

Who it’s for

• Teachers checking student writing for AI use
• Institutions integrating detection with Canvas or Classroom
• Developers adding AI detection through an API

GPTZero pricing

Free option available; paid monthly and annual plans (annual saves 45%) but amounts not shown on the page; API pricing via sales

As listed on November 9, 2026. Check gptzero.me for current prices.

Things to know

• Scans over 10,000 characters require a free account
• Team plan requires a minimum of 2 seats and card payment; purchase orders go through sales

Quick answers

What is GPTZero?

GPTZero is an AI detection tool from GPTZero, a company that says it was founded in January 2023, that identifies text written by models such as ChatGPT, Claude and Gemini.

Is GPTZero free?

GPTZero has a free plan. Paid plans are listed on its pricing page. (As listed on November 9, 2026.)

Who makes GPTZero?

GPTZero is made by GPTZero and has been available since 2023.

Where can you use GPTZero?

GPTZero is available on the web, desktop (apps, editor plugins or browser extensions) and an API for developers.

What are some alternatives to GPTZero?

Other tools filed in the same section include Quetext, Grammarly and QuillBot.

Tags

#ai-detector#plagiarism#hallucination-check#education#chrome-extension