How StayUndetectable works
AI detectors don't read your ideas — they measure statistics. Machine-generated text tends to have unusually even sentence lengths, predictable word choices and low "burstiness". Human writing is messier: sentences vary, word choice surprises, rhythm shifts. StayUndetectable exists to close exactly that gap — turning AI-drafted text into undetectable, natural writing without touching what it says.
The three passes behind every rewrite
Under the hood, each run works the text over in three stages:
- Analysis. The engine profiles your draft first: register (academic, casual, professional), language, sentence-length distribution, and the phrases that scream "language model" — the furthermores, the it is important to notes, the perfectly balanced three-item lists.
- Rewrite. Sentence by sentence, the text is rebuilt against human writing statistics: lengths get redistributed, high-probability phrasings are swapped for ones a person would actually choose, and the rhythm stops being metronomic. Your facts, names, numbers and citations pass through untouched.
- Fidelity check. The output is compared against the input for meaning and length. A rewrite that drifts from your argument or balloons your word count fails the check and gets redone — that's why results drop back into essays and documents without breaking structure.
Lite vs. Ultra
Lite is the free engine: a fast pass that removes the obvious tells — filler transitions, cloned sentence shapes, chatbot vocabulary. Use it for text that's nearly final or checks that aren't strict.
Ultra (paid plans) rebuilds the text at the sentence level against the statistical profile detectors score. It's the engine we tune against GPTZero, Turnitin, Copyleaks, Originality.ai, Pangram, ZeroGPT, Winston AI and Sapling — reach for it when the text has to pass a strict check the first time.
Why detectors flag honest writing too
Because detectors judge texture rather than truth, they produce false positives — and research keeps showing non-native English speakers get flagged most, since careful, textbook-correct writing looks statistically "safe" in exactly the way AI text does. If that's ever happened to you, you already understand the problem we solve: the texture of your writing shouldn't decide how your work is judged.
What stays, what changes
- Stays: your argument, facts, names, numbers, citations, structure, language and roughly the length.
- Changes: sentence rhythm, word choice, transitions — the statistical surface detectors measure.
Everything runs server-side: your text is sent to our API, processed, returned — never stored for training, never shared. Details in the privacy policy.
Try it on your own text
The free tier is 500 words a day with no signup — paste a draft, run Lite, and check the result against any detector you like. When the stakes are higher, the paid plans unlock Ultra from $12/month.