GPTZero

GPTZero detects AI-generated text from models like ChatGPT, Claude and Gemini, and adds plagiarism checks, writing replay and grammar feedback for educators and writers.

What is GPTZero?

GPTZero is an AI content detector that estimates whether a piece of writing was produced by a human, by an AI model such as ChatGPT, Claude or Gemini, or by a mix of both. Beyond detection, it now offers plagiarism checking, grammar feedback, citation help and a writing report that records how a document was written.

Its main audience is teachers, schools and universities, but writers, editors and businesses also use it to check the authenticity of submitted text and to show that their own work is human-written.

Key Features of GPTZero

AI detection with sentence highlighting

You paste text or upload files and get an overall AI likelihood plus highlighted sentences, with detection for mixed human and AI text and for paraphrased or "humanised" output. An Advanced Scan gives more detailed analysis.

Writing reports and video replay

In Google Docs, GPTZero can replay how a document was written, showing typing activity and copy-pastes. Students and writers can use this to demonstrate their process, and teachers can review it instead of relying only on a score.

Plagiarism checker

A separate scan compares text against outside sources to spot copied passages that lack attribution.

Writing feedback and grammar check

An AI tutor gives feedback on writing quality, and paid tiers include grammar checking and tools to find sources and generate citations.

Classroom and workflow integrations

GPTZero connects to Canvas and Google Classroom, offers a Chrome extension that works in Gmail, Docs and social media, and supports Zapier and a developer API.

Batch scanning

Paid plans allow several files to be checked at once, up to 250 on the Professional tier, which helps when grading or reviewing large volumes.

GPTZero Pricing

GPTZero has a free tier and two individual paid plans, with team seats available directly from the pricing page. Annual billing is advertised as saving around 45% compared with monthly.

Prices checked on October 27, 2026; check the official pricing page for current plans.

Institutions that need purchase orders, invoicing or larger deployments are directed to the sales team.

Who Should Use GPTZero?

• Teachers and professors reviewing essays and assignments.
• Students and writers who want to prove their work is their own.
• Editors and publishers screening freelance or guest submissions.
• Schools that need LMS integration and privacy compliance.
• Developers adding AI detection to a platform through the API.

Is GPTZero Worth It?

GPTZero is one of the most established AI detectors, and its writing replay and classroom integrations give it more depth than a simple score checker. The free plan is enough for occasional checks, and the paid tiers are reasonably priced for heavy users.

The important caveat applies to every detector: results are probabilities, not proof. False positives and missed AI text are possible, especially with short or heavily edited passages, so a GPTZero score should start a conversation rather than decide an academic or hiring outcome on its own. Used that way, it is a useful tool. Try it on the official GPTZero website.