AI Text Detector — Human vs AI Writing Estimate
Paste text and get an AI-likelihood estimate with the exact signals that triggered it. Private: the text never leaves your browser.
Quick answer: Estimate whether text was written by AI: analyzes sentence rhythm, vocabulary patterns and common AI phrasing. Free, instant, private heuristic checker — with honest accuracy notes.
How to use
- Paste the text you want to analyze (50+ words works best).
- Press Analyze — the score and signal breakdown appear.
- Use the signals to rewrite flagged patterns if you want a more human rhythm.
About this tool
This detector looks for the fingerprints large language models leave: unusually even sentence lengths (low 'burstiness'), over-smooth transitions, telltale phrases ('delve', 'it's important to note', 'in conclusion'), uniform paragraph rhythm and low vocabulary surprise. It reports a percentage plus the specific signals found, and — unlike black-box detectors — shows its working. Honest limitations: no detector is definitive; short texts and skilled editing reduce accuracy; human writers with formal styles can score high. The entire analysis runs locally in your browser — the text is never sent anywhere, which makes it the most private AI checker you can use.
FAQ
Is my text sent anywhere?
How accurate is it?
Can it be fooled?
What is 'burstiness'?
Can teachers use this for grading?
Does it work in other languages?
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Your rating stays in this browser (local storage) — nothing is sent to any server.
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