ZeroGPT review: is it accurate, and is it any good?
ZeroGPT is a popular AI detector you can use free, up to 15,000 characters per check, with paid plans for more. It does well on plain AI text and is less reliable on edited, mixed or very formal writing, so it's fine for a quick check and weak as evidence on its own.UpdatedWhat ZeroGPT is
ZeroGPT (zerogpt.com) is an AI detector with a writing toolkit around it. You paste text or upload a .txt, .docx or text-based PDF, and it returns an AI percentage, highlights the sentences it thinks are AI-written and generates a PDF report. It says its DeepAnalyse model reads signals such as token patterns, burstiness and entropy, and covers more than 35 model families, including ChatGPT, Gemini, Claude and DeepSeek.It now sells much more than detection: an AI humanizer, a plagiarism checker, a paraphraser, a summarizer, a grammar checker, a translator, AI image and video detectors and a chatbot. You can also use it through WhatsApp, Telegram and an API.Is ZeroGPT accurate?
ZeroGPT claims 98.4% detection accuracy and a false positive rate under 1%, from its own evaluations. On plain output from a chatbot it usually flags the text. On drafts that were edited, mixed with human writing or rewritten, it's less sure, like every detector. It recommends at least 150 to 200 words for a stable result.False positives are the bigger worry. ZeroGPT was one of seven detectors in a 2023 Stanford study that, on average, labeled 61% of essays by non-native English writers as AI-written. ZeroGPT's own FAQ says highly polished or formulaic human writing can resemble AI. More in AI detection false positives.Is ZeroGPT free?
Yes, there's a free plan, and the checker on its home page takes up to 15,000 characters per check. Paid Personal and Business or EDU plans raise the limits and add batch file uploads, and the API is pay as you go. Refunds can only be requested within hours of purchase, so try the free plan first. Check zerogpt.com for current prices.Strengths
- Free to use, with a high limit per check.
- Sentence highlights and a PDF report with each check.
- Many tools in one place, reachable from WhatsApp and Telegram too.
- An API with batch processing for teams that want to build it in.
Weaknesses
- Less reliable on edited, mixed and humanized text.
- False positives on formal and non-native English writing, documented in independent research.
- Its accuracy figures come from its own tests.
- A refund window of hours on paid plans.
Who ZeroGPT is for
Anyone who wants a quick, free look at whether a piece of text reads as AI. For grading, hiring or editorial decisions, use it as one input next to drafts, version history and a conversation with the writer, never as the deciding one.What Leap's free detector does
We make a competing tool, so here is exactly what it does. Leap's detector runs in your browser, free, with no account and no word limit. It needs at least 40 words and scores text from 0 to 100 from five writing signals: how evenly the sentences run, stock AI phrases, hedging and transition words, em dashes and repeated words. It scores every sentence and shows the ones that weigh most. It doesn't use a trained classifier like ZeroGPT's, so it reads style, not authorship.Try it below on your own draft. It isn't ZeroGPT and can't predict ZeroGPT's score. It's a signal, not proof, and no score, ours included, should be the only basis for accusing anyone of using AI.0 words
How it compares to Leap
Both are free detectors with sentence-level results. ZeroGPT checks up to 15,000 characters at a time and adds a large set of paid tools and an API. Leap's detector has no word limit, needs no account and runs in your browser, so your text stays on the page unless you press Rewrite, an optional paid rewrite offered under the result. Leap also has a free humanizer for cleaning up your own draft.Side by side: Leap vs ZeroGPT. For other free options, see the best free AI detectors.Verdict
ZeroGPT is a decent free detector for a quick check on plain AI text, and its toolkit now goes well beyond detection. Its weak spot is the case that matters most when a grade or a job is at stake: human writing that happens to read formal or formulaic. Treat its score as a reason to look closer.Using any detector score
A detector score is a signal, not a verdict. Never use one score as the only evidence that someone used AI: pair it with the writer's drafts and notes, a conversation, and a second detector.Frequently asked questions
On unedited AI text, usually. It claims 98.4% accuracy from its own tests. It's less reliable on edited, mixed or humanized text and on formal or non-native English writing, so treat its score as a signal, not proof.
For a quick free check, yes. It's fast, highlights sentences and checks up to 15,000 characters at a time. For decisions with consequences, don't rely on it alone.
Yes. It has a free plan, and the checker on its home page takes up to 15,000 characters per check. Paid plans raise limits and add batch uploads; the API is pay as you go. Check zerogpt.com for current prices.
Yes. It was one of seven detectors in a 2023 Stanford study that flagged 61% of essays by non-native English writers as AI-written, on average, and its own FAQ says polished or formulaic writing can resemble AI.
ZeroGPT says it doesn't save, share or publish the text you check or use it to train its model, and that its servers are in Germany under the GDPR. That's its own policy, so read it on zerogpt.com before you paste anything sensitive.
Yes. It now sells an AI humanizer and a paraphraser next to the detector. Leap's free humanizer is a lighter cleanup pass that keeps your wording and promises no detector result.
No. They're separate products with similar names. GPTZero leans toward schools, with Canvas, Google Classroom and Moodle integrations; ZeroGPT is a broad toolkit with a free detector. See the GPTZero review.