How this AI detector works
Most AI text shares a set of measurable habits. This detector scores six of them and combines them into a single 0–100 AI-pattern score. Unlike a black-box detector, it shows you exactly which patterns it found, so the result is something you can act on rather than just a number to worry about. Everything is computed locally with JavaScript the moment you click Analyze — there's no API call, no waiting, and no text leaving your device.
What each signal means
The headline score is a blend; the breakdown is where the insight is. Here's what each signal measures and why it points toward AI:
- Sentence-length variation (burstiness) — Humans mix short punchy sentences with long winding ones. AI tends to produce sentences of similar length. Low variation is the single strongest AI tell, which is why it carries the most weight.
- AI cliché density — Phrases like "delve into," "in today's world," "it's worth noting," and "a multitude of" appear far more often in machine output than in natural writing.
- Formal transitions — Over-reliance on "furthermore," "moreover," and "consequently" is a hallmark of templated, generated prose.
- Hedging language — Vague qualifiers such as "somewhat," "potentially," and "seems to" make writing mealy-mouthed in a distinctly AI way.
- Passive voice — Heavy passive construction reads as impersonal and is more common in generated text.
- Repeated sentence openers — Starting many sentences with the same word is a pattern humans rarely fall into but models often do.
How accurate is an AI detector?
Honestly: no AI detector is reliable enough to act on alone — not this one, and not the commercial ones either. The patterns that signal AI also show up in careful, formal human writing, so false positives are real and unavoidable. A meticulous academic can score high; lightly edited AI can score low. That's why this tool is built to be transparent rather than authoritative: it shows you the specific patterns it found so you can improve the writing, not to label anyone a cheater. Never make an accusation based on any detector's score.
What to do if your text scores high
A high score means the writing carries mechanical patterns — not that the ideas are bad. The fix is editing for rhythm and voice: vary your sentence lengths, cut the clichés and filler transitions, replace hedging with direct statements, and add specifics only you would write. If you'd rather not do that pass by hand, our free AI humanizer rewrites for exactly these patterns in seconds — then paste the result back here to see the score drop.
Frequently Asked Questions
Is this AI detector free?
Yes — completely free with no account, no sign-up, and no usage limit. The analysis runs in your browser, so there's no cost to run it and no reason to gate it.
Is my text stored or uploaded anywhere?
No. The entire analysis runs locally in your browser using JavaScript. Your text is never sent to a server, never logged, and never stored. You can disconnect from the internet after the page loads and it still works.
Does this work the same way as GPTZero or Turnitin?
No, and it doesn't claim to. Commercial detectors use trained machine-learning models on large datasets. This tool is a transparent rule-based heuristic that measures specific writing patterns common in AI text — sentence-length uniformity, cliché density, hedging, passive voice, and repeated openers. It tells you why text reads as AI, which those tools usually don't.
Can AI detectors be wrong?
Yes — all of them, including this one. AI-pattern signals overlap with formal human writing, so a careful academic or technical writer can score high while lightly-edited AI can score low. Treat any AI detector result as a signal about writing style, never as proof of authorship. Never make an accusation based on a detector score alone.
What score should I worry about?
Roughly: under 40 reads as mostly human, 40–69 shows mixed signals (often lightly-edited AI), and 70+ carries strong AI patterns. These are guidelines, not hard thresholds. The per-signal breakdown is more useful than the headline number — it shows exactly what to fix.