The Brand Voice Consistency Auditor: Score Any Draft Against Your Style Guide
Why this prompt matters
Inconsistent brand voice is invisible until a customer reads three pieces of content in one sitting and notices the company sounds like four different people. Teams that skip a structured voice check burn two to three extra review rounds per piece in back-and-forth Slack threads, and the inconsistency that slips through anyway erodes the trust a distinct voice is supposed to build in the first place.
What we use it for
Your startup just brought on three freelance copywriters for a product launch sprint, and marketing ops has fifteen drafts to clear before anything ships — but the only brand reference anyone has is a scattered, two-year-old Google Doc that none of the freelancers have fully read.
Prompt
Act as a senior brand editor who has fully internalized [COMPANY NAME]'s voice guidelines and reviews content the way a copy chief would before it ships. Context: Here are our brand voice principles and guidelines: [PASTE YOUR STYLE GUIDE OR VOICE PRINCIPLES HERE — tone words, banned phrases, sentence-length preferences, and 1-2 examples of on-brand vs. off-brand copy]. Here is the draft content to review: [PASTE DRAFT CONTENT HERE]. Task: Score this draft against our voice guidelines across five dimensions: tone match, vocabulary choices, sentence structure and rhythm, use of banned phrases or words, and consistency with the provided on-brand examples. For each dimension, give a score from 1-5 and cite the specific sentence or phrase that drove the score. Constraints: - Do not fix grammar or typos — focus only on voice and tone issues - Do not suggest a full rewrite; propose the smallest possible edit that resolves each flagged issue - If a section is already on-brand, say so explicitly rather than inventing a problem to flag - Flag no more than [MAX NUMBER, e.g. 3] issues per dimension, ranked by severity Output format: 1. A scorecard table: Dimension | Score (1-5) | Example quote | Why 2. A prioritized list of the 3-5 highest-impact fixes, each with the original phrase, the suggested replacement, and a one-line reason 3. An overall verdict: Ship as-is / Ship with minor edits / Needs another pass
Result
Scorecard:
Dimension | Score | Example Quote | Why Tone match | 2/5 | "Our revolutionary platform leverages cutting-edge AI to seamlessly transform your workflow." | Reads like generic SaaS marketing copy, not the warm, plain-spoken voice described in the guide — four buzzwords stacked into one sentence. Vocabulary | 2/5 | "leverages", "seamlessly", "cutting-edge" | All three terms are explicitly listed as banned words in the style guide's vocabulary section. Sentence structure | 3/5 | Opening sentence runs 28 words | The guide specifies intro sentences under 20 words; this one runs long and buries the actual customer benefit under qualifiers. Banned phrases | 1/5 | "revolutionary platform" | Directly listed as a banned phrase in section 2 of the guide, with a note that it appears in nearly every competitor's homepage copy. Consistency with examples | 4/5 | Paragraph 2: "Most teams waste an hour a day on manual data entry. We built this to get that hour back." | This closely matches the provided on-brand example — plain, concrete, benefit-first, no adjectives doing the work a specific claim should do.
Priority fixes: 1. Replace "Our revolutionary platform leverages cutting-edge AI to seamlessly transform your workflow" with "Our AI handles the repetitive parts of your workflow so you don't have to." Removes three banned words and cuts the sentence from 28 to 17 words. 2. Replace "seamlessly transform" with "handles." "Seamlessly" is on the banned list; "handles" is plainer and matches the guide's preferred verb choices elsewhere in approved copy. 3. Cut "cutting-edge" entirely rather than replacing it — the guide notes this phrase describes the technology, not the customer's actual outcome, which is the opposite of what the brand voice principles ask for. 4. Keep paragraph 2 unchanged. It's the strongest on-brand section in the draft and should be used as the reference example for the freelance writer going forward.
Overall verdict: Ship with minor edits. The opening sentence needs the fix above before this goes out; everything from paragraph 2 onward is already on-brand and ready to publish as-is.
Brand voice drift is invisible until a reader encounters three pieces of content in one sitting and notices the company sounds like four different writers. This prompt catches that drift before it ships, by turning a vague "does this sound like us" judgment call into a structured, defensible scorecard.
Why this prompt is built the way it is
The Role section asks the model to act as a senior brand editor rather than a generic writing assistant, because the task is evaluative, not generative — the model needs to adopt the skeptical, pattern-matching posture of someone who reviews copy for a living, not the helpful-collaborator posture most prompts default to.
The Context section requires both the style guide and the draft in the same prompt, because voice consistency can only be judged relative to a stated standard. Without the guide, the model would default to generic "good writing" heuristics that have nothing to do with your specific brand.
The Constraints section does two things that matter more than they look. First, "do not fix grammar" keeps the output focused on voice, not a general copy-edit — mixing the two makes the scorecard noisy and harder to act on. Second, "if a section is already on-brand, say so explicitly" exists because models left unconstrained will often invent minor issues to seem thorough, which trains writers to distrust the tool's flags.
The Output Format — scorecard, then prioritized fixes, then a single verdict — mirrors how an actual editorial review gets used. A marketing lead skimming fifteen drafts before a launch doesn't have time to read prose feedback; they need a table they can scan, a short list of what to actually change, and a one-line go/no-go call.
Where this earns its keep
The highest-value use case isn't solo writers second-guessing their own drafts — it's onboarding freelance or new in-house writers against a style guide that exists but that nobody has fully internalized. A scattered, two-year-old Google Doc of brand principles is useless as a review tool until something forces every draft through it consistently. This prompt is that forcing function, without requiring a human editor to hold the entire style guide in their head for every pass.
It also works well as a pre-submission check: have the writer run their own draft through it before sending it to an editor, so the first round of human review catches structural and argument issues instead of re-litigating "should this say 'leverage'" for the tenth time this month.