Clever AI Detector

Clever AI Detector is a content detector tool. A free, no-sign-up AI text detector that returns a 0-100 probability score, a verdict and highlighted sentence-level signals for English or Spanish text up to 10,000 words, with optional saved history.

Clever AI Detector is a free web tool that estimates how likely a piece of text was written by an AI model. Users paste between 80 and 10,000 words into a box, press the check button, and receive a probability score from 0 to 100, a verdict, and a version of the text with the sentences that triggered AI signals highlighted. It accepts English and Spanish and needs no account, with no ads or paywall on the result. The tool is built around the idea that detection is a matter of likelihood, not proof. Its scoring combines statistical analysis, such as how predictable the wording is and how uniform the sentence rhythm looks, with pattern matching for phrasing typical of AI writing, and each sentence is scored separately. The publisher is open about the limits: no detector is fully accurate, formal, heavily edited or non-native writing is flagged falsely more often, and a high score is meant to start a review, not end one. A 90% result does not mean 90% of the words were machine-written. Because it looks at writing patterns instead of a specific product, it is model-agnostic. The site lists ChatGPT, Gemini, Claude, DeepSeek, Copilot, Llama and many other writers as styles it recognizes, while noting that no individual model is guaranteed to be flagged. Typical users are editors screening guest posts, SEO and content teams auditing their own pages, professionals checking that an email or report reads like them, and writers testing a draft before sending it. An optional free account adds saved check history, so past results can be reopened and scores compared over time. Compared with typical free checkers that cap input at a few hundred words, or paid tools that put sentence-level detail behind a subscription, it offers a larger limit and full output at no cost. It sits beside the same publisher's humanizer, which rewrites text rather than assessing it. The FAQ also says the company has a habit of moving free products to a paid version after a year or two, which is worth bearing in mind.