Define Your Voice
Measure your writing style, then copy a ready-made spec so ChatGPT and Claude write like you
Paste a sample of your own writing and this measures the mechanics of your voice: how long and varied your sentences run, how you use words and punctuation, your perspective, and your readability. Then it turns those numbers into a plain-English style spec you can copy into ChatGPT, Claude, or Gemini so they match how you actually write. Everything runs in your browser; your text is never sent anywhere.
Your voice profile
Your style spec — paste this into ChatGPT or Claude
Copy this and paste it into ChatGPT Custom Instructions, Claude Custom Styles, or the top of a prompt, so the AI writes in your measured voice.
What this captures — and what it can't. It measures the mechanics of your writing: rhythm, word choice, punctuation, perspective, readability. It does not measure your ideas, wit, or judgment — the parts only you bring. Use the spec as a rhythm and register guide, not a formula.
What your voice profile measures
Your writing has a measurable fingerprint. This tool reads a sample and reports the parts of style that are objective: your average sentence length and how much it varies, your word choice, how often you reach for commas, semicolons, dashes, and questions, whether you write in the first, second, or third person, and how easy your prose is to read.
None of these numbers is a grade. Together they describe how your writing moves, so you can see your own habits from the outside and hand an AI tool a concrete description instead of a vague ask like "write in my voice."
Readability uses the Flesch formula, which estimates syllables, so treat those two numbers as approximate. Sentence boundaries are detected on periods, question marks, and exclamation points, with common abbreviations and decimals left intact.
Defining your voice, answered
What is a writing voice profile?
A set of measurable traits from your own writing: sentence rhythm, word choice, punctuation habits, perspective, and readability. It captures the mechanics of your style, not your ideas.
How do I make ChatGPT or Claude write like me?
Paste a sample here, copy the generated style spec, and paste it into ChatGPT Custom Instructions, Claude Custom Styles, or the start of a prompt. The AI then matches your measured rhythm and register instead of guessing from a one-line request.
Is this analyzer private?
Yes. All analysis runs in your browser. Your text is never sent to a server, stored, or logged, and any profile you save stays on your own device.