The short verdict
GPTZero is an easy-to-use AI detector with a free tier, sentence-level highlighting and a writing-report feature.
Our GPTZero review
GPTZero highlights sentences likely to be AI-written and gives an overall probability. Its free tier is enough for occasional checks; paid plans add bulk scanning and plagiarism checks.
Use it as a conversation starter, not proof. Human-edited AI text and formulaic human writing both confuse detectors.
What we like
- Free tier
- Sentence-level highlights
- Simple interface
Watch out for
- False positives
- Limited on free plan
- Easily fooled by edited text
Key features
- AI detection
- Sentence highlighting
- Plagiarism (paid)
- Browser extension
UK business & GDPR notes
Do not rely on detector scores as sole evidence.
GPTZero pricing (UK)
| Entry paid plan | Paid plans ~£8–£12/mo |
|---|---|
| Free plan | Yes |
Indicative pricing, may exclude VAT. Last reviewed 24 September 2026 — confirm on the vendor's site.
GPTZero: frequently asked questions
Is GPTZero free?
Yes — GPTZero offers a free plan. Paid plans start at Paid plans ~£8–£12/mo.
How much does GPTZero cost in the UK?
Entry pricing is Paid plans ~£8–£12/mo (indicative, may exclude VAT). Prices change often, so confirm on the GPTZero website before buying.
Is GPTZero GDPR compliant for UK businesses?
Do not rely on detector scores as sole evidence. Compliance also depends on how you use the tool — see our UK GDPR and AI checklist.
What are the best alternatives to GPTZero?
The best alternatives are Originality.ai.
Who is GPTZero best for?
Occasional checks of supplier or freelance content.