ScriptGrain

Your ideas. Unmistakably you. Turn your writing into a measured voice profile, so AI helps you publish posts and articles that sound like you.

One brief. Three passes.

The same brief, written three ways and scored by ScriptGrain’s voice match, the score every draft gets: “A blog post on why so much AI-assisted writing sounds the same, and what a writer can do about it.” The model alone scores 68 / 100 against the Wry Builder voice; its draft with the profile scores 74 / 100; polished toward the voice, 87 / 100. Written 5 October 2026 on Claude Sonnet 5.5. See how scoring works.

How the polished draft opens: “Picture a loading bay, with a fleet of identical delivery vans pulling in at the same moment. Each one is reliable, each took the sensible route, and every last one arrived together. Nobody is surprised. Nobody remembers which van brought which parcel.”

The same three passes on every topic in the demo:

• AI writing: “A blog post on why so much AI-assisted writing sounds the same, and what a writer can do about it.” Model alone 68 / 100, with the Wry Builder profile 74 / 100, polished 87 / 100.
• Founders: “A blog post for first-time founders on how to price your first B2B product.” Model alone 64 / 100, with the Wry Builder profile 74 / 100, polished 86 / 100.
• Client work: “A blog post for consultants and coaches on how to write a proposal a client will actually read.” Model alone 50 / 100, with the Wry Builder profile 71 / 100, polished 85 / 100.
• Personal brand: “A blog post on posting on LinkedIn when you hate self-promotion.” Model alone 73 / 100, with the Wry Builder profile 69 / 100, polished 85 / 100.

Wry Builder is a ScriptGrain voice anyone can use. For a controlled comparison, read the published test: four voice profiles (a UK challenger bank's public copy, a blunt opinion essayist, a no-nonsense B2B operator and a Victorian novelist's prose), full outputs, every shift quantified, with its method and limitations.

Measure a paragraph of yours.

Free to start, no card, and it works in ChatGPT and Claude. Paste something you wrote. ScriptGrain measures the rhythm, vocabulary, structure and habits that make it yours, then builds a voice profile AI can actually write against.

Paste 120 words or more on the homepage for an instant preview of six signals (rhythm, syntax, punctuation, lexicon, rhetoric and cadence), measured in your browser with nothing uploaded. Or use one of three sample writers: founder posts, an engineering blog or a weekly newsletter. The six signals are drawn from the same eight groups the full profile measures across 45 measured reference points when you build your free profile: lexical, syntactic, tone and register, rhetorical, punctuation and format, function words, content patterns, and quirks and cadence. Free, about 45 seconds, no card, and we never train models on your samples.

Measure, profile, write. Every draft scored against you.

ScriptGrain makes ChatGPT, Claude and the rest better at being you: it works inside the AI you already use.

1. Measure, in your browser: paste 120 words or more. Rhythm, syntax, punctuation, lexicon, rhetoric and cadence, measured in the tab. Free, nothing uploaded.
2. Profile, your free profile: all 45 reference points in eight groups, from lexical habits to quirks and cadence. Free, about 45 seconds, no card.
3. Write, scored, inside the AI you use: write in ScriptGrain or connect ChatGPT, Claude and any MCP tool. Every draft comes back with a voice-match score. One free draft, and connecting is free: see ChatGPT, Claude, the MCP setup and the API documentation.

Sign up and land in the same ledger.

The new app's Write page: the outline to continue, the voices to write with, and recent drafts with their voice-match scores. See the new interface.

It remembers what you have said. So the next draft builds on it.

Voice Brain remembers the ideas, claims, stories and frameworks your writing has covered, then checks a new brief against them: repeats, builds on, or new. One brain can serve several voices.

Our own Brand brain on 2 October 2026: 74 pieces, 796 memories and 1,379 builds-on links. Voice Brain is on every plan, including Free. How Voice Brain works.

“We have run a version of this memory inside our own setup for more than three months. It is how every AI agent we run already knows the product, and it is how they write content for us through ScriptGrain.” ScriptGrain, on using Voice Brain internally.

Start free. Pay when you write more.

Free: one voice profile, all 45 points, one draft, connect ChatGPT, Claude and any MCP tool. No card. API + MCP on every plan, 60 requests a minute.

• Writer: £12/month or £115/year. 1 voice, 40 credits a month, voice-match score on every draft, Voice Brain.
• Operator: £29/month or £279/year. 3 voices, 75 credits a month, top-ups: £10 for 40, Voice Brain, shared or separate.
• Studio: £99/month or £949/year. 10 voices, 400 credits a month, priority support, Voice Brain.

Agency: £299 monthly or £2,870 a year for unlimited voices, 1,500+ credits a month and team seats. Annual billing saves 20%. Prices in pounds sterling and include VAT. See pricing.

Before you paste. Short answers.

What happens to the text I paste?

The instant preview is measured in this browser. Nothing is uploaded until you choose to start the full analysis, and we never train models on your samples.

How much should I paste?

120 words or more of your own writing: a blog post, a long email, a few LinkedIn posts stacked together.

What are the six signals?

Rhythm, syntax, punctuation, lexicon, rhetoric and cadence: six signals drawn from the same eight groups the full profile measures across 45 attributes.

What does the free profile include?

One voice profile, one full analysis of all 45 points, one free draft, and ChatGPT, Claude and any MCP tool connected. No card.

Does it work with ChatGPT and Claude?

Yes. Connect ChatGPT, Claude or any MCP tool, free, and they write as you. ScriptGrain works inside the AI you already use.

How do I know a draft sounds like me?

Every draft comes back with a voice-match score against your profile.

What is Voice Brain?

A memory of the ideas, claims and stories your writing has covered. It checks each new brief: repeats, builds on, or new.

What do paid plans add?

More voices and drafts, from Writer at £12 a month to Agency with unlimited voices and team seats. Annual billing saves 20%.

What does your writing actually sound like?

Paste 120 words. Six signals in your browser now, all 45 in your free profile. 45 reference points, 1 free draft, no card.

ScriptGrain is operated by Adapt Progress Evolve Limited, a UK company: Terms of Service, Privacy Policy, Trust.