GPTZero review: AI text detector with sentence-level highlights, for educators, writers and teams
AI text detector with sentence-level highlights, for educators, writers and teams
Custom (contact sales), free plan: yes, prices checked on November 2, 2026.
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What GPTZero does
Checks pasted or uploaded text for AI-generated passages and highlights them sentence by sentence, with plagiarism and writing-replay tools.
GPTZero is an AI content detector. You paste text or upload a file, and it returns an overall AI score and highlights the sentences it thinks were machine-written. The vendor says it covers output from ChatGPT, Gemini, Claude, Llama and other models, and it can also look at documents that mix human and AI writing.
Beyond detection, the site lists a plagiarism checker, a grammar checker with writing feedback, and a writing replay feature in Google Docs that shows how a document was typed, including copy and pastes. A Chrome extension adds detection inside tools such as Gmail and Google Docs. For schools there are Canvas and Google Classroom integrations, and developers can use an API. A Zapier integration is also listed.
Pricing is in euros. The Free plan allows 10,000 words per month, with a Basic AI Scan, 1 Free Advanced Scan and 5 Free AI Highlights in the Chrome extension. Premium is 9,99 € per month billed yearly and allows up to 300,000 words per month. Professional is 19,99 € per month billed yearly, with 500,000 words per month and batch scanning of up to 250 files. A Professional Team Plan is also offered, at 19,99 € per seat per month billed yearly, with a minimum of 2 seats. The page text does not show monthly-billing prices.
The vendor itself states that no AI detector is 100% accurate and that results should not be used to punish anyone or as a final verdict.
- AI detection across ChatGPT, Gemini, Claude and Llama
- Overall AI score with sentence-level highlights
- Mixed human and AI text detection
- Writing replay video in Google Docs
- Plagiarism checker
- Grammar check and writing feedback
- Chrome extension
- Canvas and Google Classroom integration
- API for developers
- Zapier integration
Good for / Not for
Good for
- Teachers who want a signal to start a conversation about academic integrity
- Writers who want to show how a document was written via Google Docs replay
- Schools using Canvas or Google Classroom
- Developers who want to add AI detection through the API
Not for
- Anyone who wants a definitive verdict, since the vendor says no detector is 100% accurate
- Buyers who need invoicing or purchase orders without contacting sales
How to start
Paste text or upload a file on the homepage and press Scan; scans over 10,000 characters need a free account. source
Read the percentage of likely AI text and the highlighted phrases. source
Optionally install the Chrome extension for Google Docs and web pages. source
Choose a plan on the pricing page when the Free plan's 10,000 words per month is not enough. source
Limits and gotchas
- The Free plan includes 10,000 words monthly, along with a single complimentary Advanced Scan and five complimentary AI Highlights when using the Chrome extension. source
- Team plan requires at least 2 seats and card payment only. source
- The vendor says no AI detector is 100% accurate and results should not be used to punish. source
From the official site and docs of GPTZero, checked on November 2, 2026.
Pros and cons
Pros
- Free plan with 10,000 words per month, a Basic AI Scan and 1 Free Advanced Scan
- Sentence-level highlighting and detection of mixed human and AI text
- Writing replay in Google Docs shows copy and pastes and typing patterns
- Chrome extension, API, Zapier, Canvas and Google Classroom integrations are listed
- Team plan can be bought without a sales call, from a minimum of 2 seats
Cons
- Monthly-billing prices for Premium and Professional are not shown on the pricing page text
- Free plan is capped at 10,000 words per month and only 1 Free Advanced Scan
- Vendor states no AI detector is 100% accurate and results should not be the final verdict
- Team plan accepts card payment only; purchase orders and invoicing require contacting sales
- Prices are quoted in euros only, per month billed yearly
Our take
GPTZero fits teachers, students, writers and small teams who need a quick check of whether text looks machine-written, plus extra context such as plagiarism checks or a writing replay. The free plan is enough to try it, and the paid tiers are priced per month billed yearly. The trade-offs: the page text does not show monthly-billing prices, the free plan is capped at 10,000 words per month, and the vendor admits no detector is 100% accurate, so results are a signal to discuss, not proof. Institutions needing purchase orders or invoicing must contact sales, since the team plan is card only. We did not test the tool; this summary comes from the official pages only.
Comparisons and lists with GPTZero
Coming soon
Coming soon — we are writing comparisons that include GPTZero.
GPTZero pricing
| Plan | Monthly billing | Annual billing (per month) | Limits / what’s included |
|---|---|---|---|
| Free | Free | — | 10,000 words per month; Basic AI Scan; 1 Free Advanced Scan; 5 Free AI Highlights in Chrome Extension |
| Premium per month, billed annually | — | €9.99 | Up to 300,000 words per month; Advanced AI Scan; Multilingual AI detection; Download AI reports |
| Professional per month, billed annually | — | €19.99 | 500,000 words per month; Up to 2 million words overage; Scan up to 250 files at once; Page by page scanning |
| Professional Team Plan per seat | — | €19.99 | Min 2 seats; 500,000 words per member, per month; card payment only |
Free trial: none listed. Free plan: yes.
Prices checked on on the official GPTZero pricing page. “—” = not published.
All GPTZero plans, limits and annual prices →
Frequently asked questions
Is there a free plan?
Yes. The Free plan allows 10,000 words per month, a Basic AI Scan, 1 Free Advanced Scan and 5 Free AI Highlights in the Chrome extension.
How much do the paid plans cost?
Premium is 9,99 € per month billed yearly and Professional is 19,99 € per month billed yearly. The pricing page text does not show monthly-billing prices.
Is there a team plan?
Yes. The Professional Team Plan is 19,99 € per seat per month billed yearly, with a minimum of 2 seats and card payment only. For invoicing or purchase orders, contact sales.
Which AI models can it detect?
The vendor lists ChatGPT, GPT-5, GPT-6, Gemini, Claude, Llama and Deepseek, among others.
Is the result a final verdict?
No. The vendor says no AI detector is 100% accurate and results should not be used to punish or as the final verdict.
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