What is GPTZero?
GPTZero is an AI detection tool that analyzes written text and returns an overall AI score along with sentence-level highlights showing which parts may have been generated by models such as ChatGPT, Claude, Gemini or Llama. You paste text into the scanner on the homepage, or use the Chrome extension to check content directly in Gmail, Google Docs, Google Classroom and social media.
Beyond the basic check, the product offers Advanced Scan, plagiarism checking, a writing replay that shows how a document was typed (including copy and paste activity), a grammar and writing feedback tool, and integrations with learning management systems such as Canvas and Google Classroom, plus an API for developers.
Key features
- Overall AI score with sentence-by-sentence detection
- Detection of text from ChatGPT, GPT-5, Gemini, Claude and Llama
- Writing replay showing the typing process and copy-paste activity
- Plagiarism checker
- Grammar check and writing feedback
- Chrome extension and Google Docs integration with Canvas and Google Classroom
Who is it for
- Educators and teachers
- Students
- Writers and editors
- Recruiters and clients verifying authorship
How to get started with GPTZero
- Go to the GPTZero website and choose the option to paste text.
- Paste the text to check (up to 10,000 characters without logging in).
- Click check and read the overall AI score.
- Review the sentence-by-sentence analysis highlighting suspicious passages.
- You want to check whether a student's text may have come from ChatGPT, Claude, or Gemini.
- You need a sentence-by-sentence analysis, not just an overall score.
- You work in Google Classroom, Canvas, or Google Docs and want integrations.
- You need checks without character limits and don't want to pay for a plan.
- You are looking for a tool with a Polish-language interface, as this one is not available.
Pros and cons
- Scans text from many major AI models
- Integrates with Google Docs, Google Classroom and Canvas
- Advanced features and team use require a paid plan
GPTZero pricing
| Plan | Price | Includes |
|---|---|---|
| Professional | 0 USD / month | Price shown as 0 USD in the pricing text; the page lists monthly and annual billing (annual saves 45%). Text is incomplete, so actual price is unclear. |
Prices copied from GPTZero pricing, checked October 12, 2026. Currency as shown by the vendor; taxes may apply.
Is GPTZero free?
Yes, there is a free plan. Free basic AI detection by pasting text into the scanner; the homepage advertises it as free. Paid features are not detailed in the provided text.
GPTZero alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Turnitin | not listed | ? | AI detectors |
 Undetectable AI | 5.00 USD/mo | trial | AI detectors |
 Copyleaks | 13.99 USD/mo | trial | AI detectors |
 Originality.ai | 12.95 USD/mo | yes | AI detectors |
 ZeroGPT | not listed | yes | AI detectors |
 Scribbr | 19,95 USD | ? | Education |
Comparisons
FAQ
What is GPTZero used for?
Free AI detector that scores text for AI-generated content, sentence by sentence, for educators, students and writers.
Is GPTZero free?
Yes, there is a free plan. Free basic AI detection by pasting text into the scanner; the homepage advertises it as free. Paid features are not detailed in the provided text.
How much does GPTZero cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best GPTZero alternatives?
Closest alternatives: Turnitin, Undetectable AI, Copyleaks, Originality.ai, ZeroGPT.
Data checked October 12, 2026 on the vendor website (gptzero.me).