ZeroGPT

ZeroGPT is a free-to-start web checker that flags text likely written by ChatGPT, GPT-4/5/6, Gemini, Grok, Claude, DeepSeek, and other large language models, and pairs that detector with a separate plagiarism and duplicate-content checker. It sits inside a wider suite of writing tools on the same site, including an AI humanizer, paraphraser, summarizer, grammar checker, translator, and chatbot, so the detector is one entry point into a broader consumer toolkit rather than a single-purpose product.

A submitted document is scanned by what the vendor calls its DeepAnalyse technology, described as a multi-stage model that runs from the whole-document level down to individual sentences, highlighting the specific sentences it judges AI-generated and showing an overall AI-percentage gauge. ZeroGPT publishes a 98.4% detection-accuracy figure and a sub-1% false-positive rate on its own site, along with claimed coverage of 20-plus LLM families and support for checking in multiple languages; none of this is backed by a published independent benchmark, so it should be read as a vendor claim rather than a verified statistic. Paid plans add batch file scanning and downloadable PDF reports intended as a record of a detection run.

The free tier, which requires no signup card and never expires, is built for one-off checks by individual writers and students. Paid Personal plans (Pro, Plus, Max) raise the character limits and add plagiarism-checking word allowances for freelancers, content creators, and educators who check text regularly, while separate Business/EDU and custom Enterprise plans, plus a metered pay-per-word API, target organizations and developers who need volume access or programmatic integration.