Clever AI Detector

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Free AI text checker with a probability score and sentence-level signals

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Clever AI Detector

What it is

Clever AI Detector is a free web tool that estimates whether a piece of text was written by AI. You paste text or upload a file, between 80 and 10,000 words, and it returns an AI probability score along with highlighted sentences showing which parts read as machine-written. The site explains that it weighs signals such as predictable wording, regular rhythm and phrases common in AI output, and it stresses that results are a probability, not proof. Checks are unlimited, there are no ads, and signed-in users can keep a history of past checks. It works in English, Spanish and Portuguese and sits alongside a paraphraser and grammar checker on the same site.

Key features

AI probability score
Sentence-level highlights
Up to 10,000 words per check
Check history for signed-in users

What we liked

+ Completely free with unlimited runs
+ No sign-up needed to start
+ Honest about the limits of detection

Worth noting

· Less reliable on formal or heavily edited text
· Supports only three languages

Editor's notes

More context from AI BirdView

AI detectors are often sold as lie detectors, so it is refreshing to find one that is so candid about uncertainty. Clever AI Detector frames every result as a probability and shows the specific sentences that pushed the score up, which turns a vague verdict into something you can actually review. Being free, ad-free and unlimited makes it easy to keep in your regular editing routine.

An overall AI probability score paired with sentence-level signals you can inspect
Paste text or upload a file, with up to 10,000 words per check
Unlimited checks with no ads and no paywall, according to the site
Optional sign-in to keep a history of earlier checks
Support for English, Spanish and Portuguese text

It is best for editors, content managers, SEO teams and writers who want a quick read on whether a draft sounds machine-made. The site says it ranked first on the GEDE education benchmark, though, like any detector, it can produce false positives. A practical tip: never treat a score as proof on its own, especially in school or hiring decisions; read the highlighted sentences, consider the writer's usual style and talk to them before drawing conclusions.