Quick answer: GPTZero and ZeroGPT are two different AI detectors from two different companies — the similar names are a coincidence that confuses a lot of people. GPTZero is the better choice when results need to be trusted: it has lower reported false-positive rates, explainable sentence highlights, Writing Replay and school integrations. ZeroGPT is cheaper and bundles extra writing tools, which suits quick, casual checks.
Last updated: October 2026. Pricing from each vendor and independent pricing trackers; confirm current prices on the official sites.
GPTZero vs ZeroGPT: side-by-side
| Feature | GPTZero | ZeroGPT |
|---|---|---|
| Website | gptzero.me | zerogpt.com |
| Free plan | Yes — monthly word allowance | Yes — about 15,000 characters per check, ad-supported |
| Paid plans from | ≈ $12.99/mo (≈45% off yearly) | ≈ $9.99/mo Pro, ≈ $26.99/mo Max (≈30% off yearly) |
| Sentence-level highlights | Yes, with plain-language explanations (Advanced Scan) | Yes, suspected sentences highlighted |
| Writing process proof | Writing Replay in Google Docs | Not offered |
| Extra tools | Plagiarism checker, grammar feedback, hallucination detector | Paraphraser, summarizer, grammar, plagiarism, translator |
| Integrations | Chrome, Google Docs, Google Classroom, Canvas, Zapier, API | API; WhatsApp and Telegram on Max plan |
| Compliance | SOC 2 Type II, FERPA, GDPR, CCPA | Not prominently documented |
| Best for | Teachers, schools, publishers, recruiters | Casual one-off checks on a budget |
Accuracy and false positives
This is the biggest difference. GPTZero reports 99.9% accuracy on its own benchmark and, on the independent RAID benchmark, caught about 95.7% of AI text while misclassifying around 1% of human text.
ZeroGPT markets accuracy above 98%, but several 2026 third-party tests reported much higher false-positive rates — figures roughly in the 15–25% range on human-written samples, with real-world accuracy closer to 70–85%. Many of those testers sell competing tools, so treat exact figures with caution, but the direction is consistent across reviews: ZeroGPT flags human writing as AI more often.
For a teacher or employer, that matters more than price. A false accusation can do real harm. See our full GPTZero accuracy breakdown.
Features
Where GPTZero wins
- Explainability — Advanced Scan tells you why passages were flagged.
- Writing Replay — video-style proof of how a Google Doc was written.
- Education stack — Google Classroom and Canvas integrations, admin tools and compliance documentation.
Where ZeroGPT wins
- Price — the entry paid tier is a few dollars cheaper.
- All-in-one writing tools — paraphrasing, summarizing and translation in the same account.
- No signup for basic scans.
Pricing
GPTZero's paid plans start around $12.99/month (Premium) and $24.99/month (Professional), with large annual discounts. ZeroGPT Pro starts around $9.99/month and Max around $26.99/month. If you only need a rough check now and then, ZeroGPT's free tier is fine. If you scan regularly, GPTZero's annual plan narrows the price gap. Details in our GPTZero pricing guide.
Verdict: GPTZero or ZeroGPT?
- Pick GPTZero if you are a teacher, school, editor or employer, or if you need results you can explain and defend.
- Pick ZeroGPT if you want a free or cheap quick check plus paraphrasing and summarizing tools, and the stakes are low.
FAQ
Is GPTZero the same as ZeroGPT?
No. They are separate products from separate companies with different detection models, prices and features.
Which is more accurate, GPTZero or ZeroGPT?
Most 2026 independent tests rank GPTZero higher, mainly because it produces fewer false positives on human writing.
Is ZeroGPT free?
Yes, ZeroGPT has a free, ad-supported tier with a per-check character limit. GPTZero also has a free plan.
Can I use both?
Yes — some users run a second detector as a cross-check. If the two disagree, rely on the highlights, writing history and a conversation rather than either score alone.