AI Writing Checker

This tool measures the writing patterns that make prose read as machine-generated, and reports each one with the evidence behind it. It does not output a percentage chance that a model wrote your text, because that number cannot be produced honestly and the harm from producing it anyway is real.

Here is the problem with AI detectors. They are statistical classifiers guessing at authorship from surface features, and they are unreliable enough that OpenAI withdrew its own for low accuracy. Their false positives fall hardest on people writing in a second language, whose prose is measurably more regular and therefore looks more machine-like to a classifier. A confident-looking "87% AI-generated" gets used to accuse a student or reject a freelancer, and there is nothing underneath it that can carry that weight. Any tool that shows you such a number is inviting you to make a consequential decision on a coin flip.

What can be measured honestly is the text itself. Sentence-length variation, usually called burstiness, is the strongest single signal: human writing mixes a three-word sentence with a thirty-word one, while machine drafts settle into a uniform middle length. Vocabulary density counts how often the text reaches for the small set of words models overuse. Hedge density counts phrases like "it is important to note that" which add length without meaning. Em dash rate counts a character models produce several times more often than someone typing. Connective openers count sentences that begin with Moreover or Furthermore.

Each of those is a fact about the writing rather than a claim about the writer, and each is reported with the matches that produced it, so you can check the measurement rather than trust it. That makes the result useful for the thing it is actually good for: editing. Low variation and heavy hedging make prose worse regardless of who wrote it, and both are fixable.

Use it to diagnose your own drafts, to see which parts of a document read as formulaic, and to understand what the patterns are. Do not use it, and do not let anyone use it, to decide whether a person is telling the truth about their own work. Everything runs in your browser; nothing is uploaded, logged or stored.