AI Content Detector
Paste any text and find out whether it was written by a human or generated by an AI (ChatGPT, Claude, Gemini, etc.). Free — 5 checks per day with a Google account.
How to detect AI-generated text
AI language models like ChatGPT, Claude, and Gemini produce text with characteristic patterns: unusually consistent sentence length, high-frequency "filler" transitions ("Moreover", "It is worth noting"), heavier em-dash use, and repeated sentence openers. This detector scores those patterns directly with a fixed heuristic — no text is sent to an external AI model to generate the result, and the score is not a calibrated statistical probability (see below).
For best results, submit at least 150–200 words. Heavily edited or paraphrased AI text will score lower on the AI-likelihood meter, because the human editing obscures the original model's stylistic fingerprint.
This score is a heuristic, not a calibrated probability. It is not benchmarked against a labeled validation dataset, and no confusion matrix, false-positive rate, or subgroup analysis (e.g. by language or writing style) is published for it. Independent research has also found that AI-text detectors in general can systematically misclassify non-native-English writing and can be defeated by simple prompting (arxiv.org/abs/2304.02819). Treat the result as one input among several, not a verdict.
Frequently Asked Questions
It scores writing patterns known to differ between human and AI-generated prose — sentence-length variation, AI stock phrasing, em-dash frequency, repeated sentence openers, and contraction use — against a fixed heuristic, not a trained statistical model. No text is sent to an external AI model.
It has not been benchmarked against a labeled dataset, so no accuracy, false-positive rate, or per-language figure can be honestly stated for it. Treat the score as a heuristic signal, not a validated probability. Independent research shows AI-text detectors in general can misclassify non-native-English writing and can be defeated by simple prompting (see arxiv.org/abs/2304.02819) — the same caution applies here. Heavily edited AI text, paraphrasing, or very short passages make any detector, including this one, less reliable.
Login lets us enforce fair-use limits (5 checks per day) so the tool stays free. We store only your Google ID, email, and name — we never read or post anything on your behalf.
The detector is model-agnostic. It flags text from ChatGPT (GPT-4, GPT-4o), Claude, Gemini, Llama, Mistral, Cohere, and other large language models.
No. We only log metadata (character count, result label, probability). The text you paste is never saved to our servers.