An AI writing tool that sounds British, because you are

Most AI writing tools are built American and localised later, which is why drafts come back optimizing, leveraging and reaching out. ScriptGrain takes UK English as a setting, not a correction, and more usefully, it takes your own writing as the model.

Why the accent keeps slipping

Telling a model to use British English gets you the spellings and little else. What leaks through is register: the habit of enthusiasm, the cadence, the sign-off that reads like a sales email. Spelling is the easy half; the tell is rhythm.

What is actually UK about it

What a UK business should look for

Start with the boring stuff. It's where most tools fall over.

Four checks cover it. Run them in this order, because the early ones fail fastest:

  1. British English as a setting, not an afterthought. It should be applied when the draft is generated, so "organise" and "programme" arrive correctly the first time. If you have to find-and-replace afterwards, the tool hasn't really done the job.
  2. Prices in pounds, with VAT included. A dollar price plus a mental conversion plus a guess at the tax is three chances to get the budget wrong.
  3. A straight answer on where your data is stored, and by whom.
  4. Drafts that sound like your business. This is the one people skip, and it's the one that decides whether anyone keeps using the tool.

ScriptGrain ticks the first two by default. British English is the default, with a US edition if you need it, and every price is in pounds and includes VAT. Fair enough, plenty of tools do one of those. Fewer do all four.

The fourth check is where a voice profile earns its keep. ScriptGrain measures how you write from things you've already published: 45 attributes in 8 layers, covering everything from average sentence length and contraction rate to how you open a piece and whether you lead with evidence or a conclusion. Generic "tone of voice" settings (friendly, professional, confident) can't do that. They describe a mood. A profile describes habits.

British English goes deeper than spelling

Spelling is the easy bit. Any tool can turn "color" into "colour".

The harder difference is register. British business writing tends to understate where American copy oversells. A US draft says "we're thrilled to announce a game-changing partnership". A British one says "we've started working with a new supplier, and so far it's going well". Same news. One of them reads like a press release; the other reads like a person.

Hedging runs differently too. British writers often soften a claim with "rather", "quite" or "a bit", and then mean it fully. "That's quite good" can be high praise. A tool trained mostly on American text will either strip those softeners out or pile them on, and either way the draft sounds like someone doing an impression of you.

Then there's the small stuff that adds up. Exclamation marks are used sparingly. Humour is dry and usually sideways. Sentences open with "Right," or "Anyway," or "To be fair," in a way that would look odd in a US sales email. Punctuation habits differ as well: single quotation marks, the full stop sitting outside the quote unless it belongs to it, dates written day first.

None of this is a rule you can tick in a settings panel. It's pattern, and patterns are measurable. That's why ScriptGrain scores formality on a 0 to 10 scale, tracks confidence against hedging, and records your exclamation and dash habits as numbers. If your own writing is dry and sparing with enthusiasm, the profile says so, and the drafts follow.

Where your writing goes

You're handing over samples of your writing and, later, your drafts. You should know exactly what happens to them. Here's the plain account.

ScriptGrain is built and run by Adapt Progress Evolve Limited, a UK company registered in England and Wales (company 10047328). Account data is stored in the EU, in Ireland, with Supabase. The Claude models from Anthropic (United States) measure a voice and write the drafts. Voyage AI (United States) makes the embeddings used in scoring.

That means some data does leave the UK. Where it does, the provider signs the UK International Data Transfer Agreement or the UK Addendum to the EU Standard Contractual Clauses. That's the legal basis, and it's worth asking any vendor which one they use. If they can't name it, that tells you something.

Now the things that never happen:

Two more points are practical. API keys are stored only as a hash, so a leaked database doesn't hand anyone your keys. And you can download everything held about you, or delete your account and its samples immediately, from Settings.

The profile itself travels by API and MCP. ChatGPT, Claude, Gemini, Cursor, Meta Muse and any MCP client read it live each time, and both routes are on every plan including Free. It isn't a block of text you paste into a prompt and then forget about. Edit the profile once and every connected tool sees the change.

Starting small

Don't start by rolling this out to the whole company. Start with one person's voice and find out whether it works.

The free plan gives you one profile and one full analysis, no card needed. Feed it a piece or two of your own published writing. The minimum is a single sample of 50 words or more, but three or more pieces and about 3,000 words gives a far steadier result. Extraction usually takes under a minute; the median measured on 28 September 2026 was 39 seconds.

Then write something and look at the score. Every draft is marked from 0 to 1 against the profile. On-voice drafts typically land between 0.85 and 0.95. Partial matches sit between 0.5 and 0.8, and anything under 0.45 is clearly a different voice. The score comes with per-feature deltas, so you see the draft's value next to the profile's value: sentences running long, hedging too heavy, too many semicolons. If a draft falls short, Polish revises it towards a target score (0.9 by default).

If it works, the pricing is simple. Writer is £12 a month for one profile. Operator is £29 a month for three. Both include VAT.

Which to pick depends on how many voices your business actually has. A sole trader or a founder who writes everything needs one. A small firm usually has a few: the owner's own voice, the company's website voice, and perhaps a sales voice that's a bit looser. That's three, and that's Operator.

The profile can also be built from a public website, using brand mimic, but only if you confirm you own the site or have the right to use it. Handy for capturing a house style that nobody ever wrote down.

Fair warning: the first profile is where you learn the most. You'll find out how you really write, which is often not how you think you write.

Writing in American English? See the US edition of this page.