Brand Voice Guardian

How to use

What this can do

Score copy against a brand's tone of voice guidelines
Flag specific words or phrases that feel off-brand
Check if copy fits the channel it's written for
Rewrite your copy in any output format you choose
Remember your house rules between sessions

What it can't do

Replace your judgment — you know the context, it doesn't
Check factual accuracy, pricing, or product claims
Evaluate design, visuals, or overall campaign strategy
Approve copy for publishing — that's still a human call
Apply corrections beyond what you've saved as house rules

How it works: Select your input channel, paste your copy, choose an output format for the rewrite, enter your API key, and hit Analyze. You'll get a brand voice score, specific feedback, and a rewrite tailored to whichever format you need. Treat it as a starting point — your instincts matter more than the number.

Evaluate copy

What are you evaluating?

Written content

Blog posts

Social & video

Paste your copy

Your house rules Saved

+ Add

✓ Saved to your browser

Rewrite this copy as a...

Written formats

Social & video

Anthropic API Key (never stored)

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/ 100

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Observations

Suggested rewrite AI GENERATED

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This tool was built as a portfolio demo using Mailchimp's publicly available Content Style Guide, published under a Creative Commons Attribution-NonCommercial 4.0 International License. Source material including voice guidelines, grammar rules, and the word list can be found at styleguide.mailchimp.com. This tool is not affiliated with or endorsed by Mailchimp. It is not for commercial use or sale.