GPTZero
Detects AI-generated text and verifies authorship for educators, publishers, and editors.
FreemiumFree planNo credit cardWeb
Last verified Jun 30, 2026
Decision snapshot
Fast-read signals for fit, pricing, and trust.
- Category
- Content Marketing and Copywriting
- Best for
- AI content detector
- Pricing
- Freemium
- Access
- Free plan available
What is this tool?
GPTZero is an AI-content detector that estimates whether text was written by a model such as ChatGPT, Claude, Gemini, or Llama. It scores submissions, highlights likely AI passages, and adds authorship verification and a plagiarism check. It is aimed at teachers, publishers, and editors who need to judge whether writing is human, with the honest caveat that no detector is certain. Best used as a signal, not a verdict.
By QT Desk
Read full overviewHide full overview
You paste or upload text — or open a submission inside a connected learning system — and it returns an AI-likelihood score with the most suspect passages highlighted, drawing on a multi-component model trained on output from systems like ChatGPT, Claude, Gemini, and Llama. Alongside detection it can verify authorship through writing reports or replay, and run a plagiarism check against outside sources.
It is aimed at the people who review others' writing — teachers, academic institutions, publishers, and editors — and it connects to learning platforms such as Canvas and Google Classroom so checks happen where work is submitted.
The caveat that shapes everything: detection is probabilistic. A high score points to writing worth a closer look, not a proven verdict, so it belongs in a human decision rather than replacing one.
Is this right for you?
Quick fit check against how you actually work.
Choose this if
- You review student or submitted writing for authenticity
- You want AI detection plus authorship and plagiarism checks
- You work in education or editorial review
- You need to integrate with an LMS like Canvas
Consider alternatives if
- You need a guaranteed, certain verdict on AI use
- You want a writing or content-generation tool
- Your policy can't act on a probabilistic signal
Key features
What you can actually do with this tool.
AI text detection
Estimates whether a passage was written by a model, covering major systems such as ChatGPT, Claude, Gemini, and Llama, and highlights the sections that look generated.
Advanced scan
Runs a closer, multi-step analysis aimed at higher accuracy with fewer false positives when a result needs more confidence than a quick check gives.
Authorship verification
Uses writing reports or video replay of the writing process to help a person demonstrate that work is genuinely their own.
Plagiarism check
Checks whether content was copied from outside sources without attribution, so reviewers can judge originality alongside AI likelihood.
Writing feedback tools
Offers AI-powered writing guidance aimed at building responsible writing habits rather than only flagging problems.
LMS integrations
Connects with learning systems including Canvas and Google Classroom so checks happen inside tools educators already use.
Plans & pricing
Pricing tiers and what's included in each.
Free plan available. Paid plans start at $12.99 per month.
Free
Free
Premium
$12.99/mo (300k words)
Professional
$24.99/mo
Enterprise (e.g. 2-seat
$599.76/yr
Pricing last checked: Jun 30, 2026Pricing may have changed. Always verify before purchasing.
How to use this tool
A short path to first value.
Paste in or upload the text, or open
a submission inside your connected learning system.
Run the detector to get an AI-likelihood score
for the whole piece.
Review the passages it highlights as most likely
to be AI-generated.
Run the advanced scan when a result is
borderline and needs a closer look.
Add a plagiarism check or authorship verification to
gather supporting evidence.
Weigh the signal alongside your own judgement before
making any decision about the work.
Frequently asked
Common questions about this tool, answered.
How should a flagged result be handled?
Treat a high score as a prompt to look closer, not proof. Pairing it with a human read, and with authorship evidence where a grade or publication is at stake, is the defensible way to act on it.
Can a writer contest a false positive?
Authorship verification through writing reports or replay of the writing process lets a writer demonstrate the work is genuinely theirs, which is what resolves a disputed result rather than the score on its own.
Is it practical for large volumes of submissions?
It is built for review at scale, so a reviewer can run a set of submissions and triage which ones to examine more closely, instead of reading each cold.
Does it check anything beyond AI likelihood?
Yes — a plagiarism check looks for copied, unattributed sources, so a reviewer can judge originality and authenticity in the same pass.
How it compares
Context for choosing between this tool and alternatives.
Choosing between detectors comes down to how each performs on your kind of writing and how it treats false positives, not a single headline number. Pick this one when you want detection paired with authorship and plagiarism checks for review work. If plagiarism and originality are the priority, Copyleaks or Originality.ai focus there; other detectors such as Winston AI overlap. Because every detector is probabilistic, many reviewers run more than one and treat agreement as added confidence.
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Verified against the official siteLast verified Jun 30, 2026