# One Agency, Twelve Client Voices, Zero Mix-Ups
Every client sounds like themselves. Every writer knows exactly how. Every draft gets checked before it ships.
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Here's the thing about agency voice work: it's a contamination problem.
You've got six clients, three writers, and one shared Claude tab. Client A's cheeky fintech tone bleeds into Client B's buttoned-up law firm copy. It happens quietly, in a phrase here, a rhythm there, and nobody notices until the client does. That's not a training issue. That's a tooling issue.
One measured profile per client, not a vibe
ScriptGrain runs a two-pass stylometric analysis on each client's real writing: lexical patterns, syntax, tone, rhetorical habits, punctuation, function words, content structure, quirks. 45 attributes in total. Not "sounds punchy, uses emoji." Actual measurement.
Every generation is locked to exactly one profile. No blending, no drift, no Tuesday where the sarcastic client suddenly reads sincere.
Onboard a new writer in an afternoon, not a fortnight
Here's what usually happens: new writer joins, you hand them a three-year-old brand deck and hope. Doesn't work.
Instead, export the profile as a tone-of-voice prompt. Drop it into Claude, ChatGPT, or Notion. It doubles as the client's style bible, except it's built from what they actually write, not what a workshop once decided they should sound like. Writer three drafts in, sounding right, same afternoon.
QA that doesn't rely on someone's gut
Every draft gets a voice-match score against the client profile. So your reviewer isn't asking "does this feel like them?" and guessing. They're looking at a number. Fast QA, fewer client escalations, less back-and-forth over something that's ultimately measurable anyway.
Built for how agencies actually work
Shared workspaces so the whole team sees the same client profiles. Per-member credit caps so one enthusiastic junior doesn't burn the month's allowance by Thursday. Everything exports portably, so you're never locked to one AI tool.
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Plans
Studio, £99/month
10 client profiles. Right for smaller shops running a handful of accounts without the overhead.
Agency, £299/month
Unlimited client profiles, 10 seats included. Built for agencies scaling across a full client roster.
(Solo writers and small teams starting out: Writer at £12/month covers one profile, Operator at £29 covers three.)
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Start free, no card required
Build one voice profile and run a full analysis at no cost. See the 45 attributes for one client before you commit to anything.
Fair enough if you want to test it on your trickiest client first. That's usually the one worth proving.
Because at the end of the day, a client's voice is the thing you're actually selling. Might as well measure it properly.
ScriptGrain · Why ScriptGrain · Sample voice profiles · The Journal · Support