Your email stopped sounding like you.

Works the first time you use it

Paste a draft and Voiceprint marks every line that reads as machine-written, then hands you the replacement. Em dashes, "it's not X, it's Y", tidy lists of three, hedging, in-conclusion endings, and the vocabulary nobody actually says out loud. You don't set anything up and you don't train it first.

That's the part that pays off in the first minute. Most people stop there and it's still worth having.

Then it learns your voice

When you're ready, paste in a handful of emails you wrote yourself with no AI involved. Old client emails work best. From those Voiceprint builds a short profile of how you write: how formal you are, the rhythm of your sentences, the words you reach for, and how you deliver bad news, which is the part of business writing nobody can fake.

After that it doesn't just catch the robot phrasing. It tells you where a draft stops sounding like you, quotes the line, and says what your version would have done instead.

Why we built it for business writing

Other voice tools profile the version of you that writes articles and conference talks. That's not the writing that costs you anything. What matters is the reply to an unhappy client at four on a Friday, the proposal that decides whether you get the work, and the note explaining why something broke.

That writing is short, it carries consequence, and it goes to someone who already knows you. A profile built from your blog won't sound like you on a Tuesday afternoon.

What you get

One file, sent to your inbox. It works in Claude, and the instructions for ChatGPT and Gemini come with it. Nothing to install, nothing to pay for, and no trial that runs out.