Paste a text that may have come from Grok and see which sentences read like output from an AI chat. The demo below checks a section of up to 3,000 characters without signing in; with a free account you see all seven detectors side by side.
Six more detectors
Grok is a model from xAI. People know it mainly from the X network, where it replies to posts and works with current events. It often writes more casually than other chats, but a conversational tone does not mean a person wrote the text.
Detectors do not measure how formal a text is but how regular and predictable it is. Even a funny text can have sentences of similar length and the same paragraph structure.
Which model wrote the text. The result does not say that the text came from Grok specifically. The differences between models are smaller than the differences caused by the prompt or by later edits, and an independent detector has no key to their watermarks.
Nor can it reliably recognise text that someone thoroughly rewrote, translated or mixed with their own after generating it. With text like that the detectors disagree and the result is borderline.
The check needs at least 100 characters, and with just a few sentences the result is indicative only. A single post from X therefore rarely proves anything. A longer continuous text, such as a thread or an article, is more reliable.
Delete links, mentions and hashtags before checking. They are not part of the style and do not help the result.
A high score is not proof that the text came from Grok, and a low one is not proof of the opposite. No AI text detector is one hundred per cent accurate.
When you check someone else's text, take the result as a basis for questions: why the author chose this source, what the term in the second paragraph means, how they reached the conclusion. When you check your own, it shows you the passages worth rewriting in your own words.
Only if it has at least 100 characters, and even then the result is indicative only. A short text does not give the detectors enough material.
It may. A low score is therefore not proof that a person wrote the text. What matters most is how regular the sentences are, not how relaxed the text sounds.
At least 100 characters; a continuous paragraph or a whole chapter is more reliable. With just a few sentences the result is indicative only.
Yes. The check measures the properties of machine writing in general, not the signature of a particular model, so you can check text from ChatGPT and other models in the same way.
Texts up to 300,000 characters, seven detectors at once, colour-marked sentences and a history of your checks. The account is free and needs no card.