Side by side
| Feature | GPTZero | Originality.ai |
|---|---|---|
| What it does | Free AI detector that scores text for AI-generated content, sentence by sentence, for educators, students and writers. | AI detector and content checker that flags AI-generated text and plagiarism for writers, editors, teachers and publishers. |
| Price from | not listed | 12.95 USD/mo |
| Free plan | yes | yes |
| Platforms | web, chrome, api | web, chrome, api |
| API | yes | yes |
GPTZero: 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
Originality.ai: key features
- AI text detection with sentence highlights
- Plagiarism checker
- Deep Scan with editing suggestions
- Bulk scan of multiple texts
- Chrome and Google Docs extension with writing replay
- AI detection API
FAQ
Is GPTZero or Originality.ai better?
It depends on the job - compare prices, free plans and features in the table above.
Are GPTZero and Originality.ai free?
GPTZero: 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. Originality.ai: Yes, there is a free plan. Basic plan with AI detection only: 3 scans per day, limit of 2,000 words per scan, file upload (docx, pdf, doc). No subscription required.