Brand voice

Brand voice is the consistent set of writing habits a brand's published copy shares: its register, sentence rhythm, vocabulary, punctuation and structure. Described, it is a page of adjectives; measured, it is a set of attributes extracted from the brand's own writing that any new draft can be scored against.

The numbers

What brand voice is

Voice is the sum of hundreds of small habits repeated often enough to become recognisable. One contraction doesn't make a voice; eighteen per thousand words, consistently, does. One short sentence doesn't either; a pattern of short sentences after long build-up ones starts to.

The trick is that these habits are invisible individually and obvious in aggregate. Readers can't tell you your average sentence length. They can absolutely tell you when a landing page suddenly sounds like someone else wrote it. That gap, between what people notice and what they can name, is exactly what a voice profile is built to close. See /reference/writing-voice-attributes for the full breakdown of what gets measured and why.

The eight layers it is made of

A full profile runs to 45 attributes across eight layers. Lexical covers six: vocabulary diversity, preferred words, word length, rare words, fillers, contractions. Syntactic covers seven: sentence length and variance, complexity, clause ordering, brackets, dashes, semicolons. Tone and register covers six: formality, humour, expressiveness, contraction rate, confidence versus hedging, audience adaptation. Rhetorical covers six: opening style, closing pattern, metaphors, repetition, transitions, argument structure.

Punctuation and format adds another six: commas, exclamations, ellipses, questions, capitalisation, lists. Function words brings five: the/a/an ratio, but/however/yet preference, pronouns, discourse markers, paragraph openers. Content patterns adds four: specificity, anecdotes, claim density, analogies. And quirks and cadence closes it out with five: habitual spellings, rhythm, paragraph length, power-sentence position, structural signatures.

That's the full 45. A profile gets built from a brand's own published writing, three pieces minimum, around 3,000 words recommended, or a public site read with consent. More on that at /reference/brand-voice-measurement.

Described versus measured

A style guide says "warm but professional." A profile says formality 4.2, contraction rate 18 per 1,000 words, "you" as the dominant pronoun. Both are trying to describe the same thing. Only one of them can actually score a draft.

Here's the thing: adjectives can't be enforced. You can't run a document through "warm but professional" and get a number back. You can run it through a profile and get 0.85, or 0.6, or 0.4. Anything at 0.85 or above reads as on voice. Between 0.55 and 0.79 is drifting. Under 0.55 is off. And when you're checking consistency across several writers, that consistency literally is the spread of their scores; tight spread, aligned team; wide spread, everyone's writing a slightly different brand.

What it cannot tell you

A profile won't tell you if the argument is any good. It won't catch a factual error, and it won't tell you whether the offer on the landing page is the right offer. Voice measurement checks how something is said, not whether it should be said at all. Fair enough; that's a different job, and a template like /reference/brand-voice-guidelines-template covers the parts a number can't.

It also can't invent taste. The profile reflects whatever the source writing already does, good habits and bad ones alike. Feed it inconsistent source material and you'll get an inconsistent target. That's not a flaw in measurement; that's measurement doing its job honestly, which is more than most style guides manage.

Worked example

a brand's measured profile reads formality 4, average sentence length 14 words, contractions around 18 per 1,000 words, and "you" as the dominant pronoun. A new landing page draft comes in for review, run through /tools/brand-voice-analyser before publication.

the draft measures formality 7, average sentence length 22 words, contractions down to 3 per 1,000 words, and "we" now dominant over "you". Four attributes moved, and moved together: more formal, longer sentences, fewer contractions, a pronoun swap that shifts the whole address from reader-facing to company-facing. Against the source profile, this draft would score as off voice, well under the 0.55 floor, not merely drifting.

a style guide would have flagged this as "a bit corporate" and left it there. The measurement names the four habits that actually need fixing: shorten the sentences, bring the contractions back, drop the formality by three points, and put "you" back at the centre of the page. See /glossary/voice-drift for what happens when nobody catches this in time.

Sources

More terms