Clever AI Detector. Free AI checker with Sentence-Level Analysis

Clever AI detector is a free AI checker which approximates how likely any text was generated by AI. On statistical signals like predictability of words, consistency of rhythm, similarity to phrasing of common AIs is carried the check. Then matching is scored in percent for every sentence separately; the final score is given also in a scale of 0-100.

No AI detector is 100% accurate, not even ours — treat with caution any tool that claims to detect AI content beyond doubt. The Clever AI Detector provides you with a probability, along with signals at a sentence level, and is upfront about when it is not confident in its results. As such, do not rely on the score alone – treat it as one piece of information amongst others.

There are no catches. CleverFiles as a company has a tradition of releasing a product for free and moving on to a paid version after 1-2 years. The detector is completely free to use, no ads and no paywall.

Yes. Most text created by AI chatbots carries the same statistical patterns: similar sentence lengths, predictable word choice, characteristic phrasing. The Clever AI Detector hunts for these patterns whatever produced the text — ChatGPT, Gemini, Claude, DeepSeek, or another AI writer.

A false positive is human writing that a detector wrongly marks as AI. Every detector produces them, and formal, heavily edited or non-native texts get hit most often, because that writing is naturally more uniform. Detection is a probabilistic job — the answer is never certain, only more or less likely — which is why we report a probability with sentence-level cues, and why a high score is the start of a conversation rather than the end of one.

Copy your text into the input box and click “Check for AI”. A moment or two later, you will see an AI probability score, the result along with the confidence level, and a list of the most suspicious sentences.

The score is the probability that your text was generated by AI. 90% AI does NOT mean "90% of the text is AI", it means that the statistical profile is close enough to AI writing to be reasonably certain. The closer the result is to the middle, the less certain we are, and we say so explicitly.

Articles, blog posts, emails, product descriptions, reports, marketing copy – your choice of English text, any length between 80 and 10,000 words. Anything shorter than that contains too few signals for the score to be meaningful and that is why there is an 80-word minimum requirement.

They are opposite ends of the same question: an AI detector guesses if a text was written by AI, while an AI humanizer softens AI-written text. Both function on this page as a team: check your text here, and if it's the tone that's the problem, refine it with Clever AI Humanizer.

Checks are run to calculate your score and signed-in users can maintain a history of their checks if they so desire. See our Privacy Policy for additional information regarding how we process your data.

You make the decisions you base on a result — a score is a probabilistic signal, not a verdict, and should never be the sole basis for action affecting a person. Our Terms of Service describe our responsibilities and their limitations; nothing in these Terms affects rights that you have under mandatory consumer law.

Yes. Clever AI Detector is a free online AI checker. Simply paste in text to check for AI, no sign up, ads or paywall. Creating an account is entirely optional and just unlocks check history.

Yes. ChatGPT, GPT-4, GPT-5 generate the same statistical patterns in the text as any other AI model would: similar phrases, word choice patterns, rhythm, etc., so our AI checker works as a detector for ChatGPT as well. Same goes for Gemini, Claude, DeepSeek and other models.

Transparency about uncertainty. The best AI detecting software is the one which reports a probability, provides evidence at sentence level and doesn't hide its lack of confidence — and that is the approach Clever AI Detector takes. This way you can assess the result for yourself, rather than blindly trusting an over-claiming algorithm.

Because it is trained on the latest LLMs and on millions of human and AI-written texts. It is completely free to use, with sentence-level signals and a confidence level included.