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

  1. Paste the text you want to analyze (50+ words works best).
  2. Press Analyze — the score and signal breakdown appear.
  3. 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?
No — the whole analysis runs locally in your browser; nothing is uploaded.
How accurate is it?
Directionally useful, never definitive — treat it as one signal, not a verdict. Long texts are more reliable than short ones.
Can it be fooled?
Yes — heavy editing, varied sentence lengths and personal anecdotes lower any detector's confidence, including ours.
What is 'burstiness'?
Humans vary sentence length a lot; models tend toward uniform rhythm. Low variance raises the AI score.
Can teachers use this for grading?
Use it as a conversation starter, not evidence — false positives happen with formal human writing.
Does it work in other languages?
The phrase signals are English-based; rhythm signals work in any Latin-script language.

Rate this tool

Your rating stays in this browser (local storage) — nothing is sent to any server.

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