Draft — not for publishing yet. Needs a human review pass for accuracy, links and examples. Any TODO in the text is a note for the team.
How to write a brand voice guide an AI can actually follow
Vague voice guidelines produce vague copy. A short, concrete guide that names words, sentence length and forbidden phrases works far better.
6 min read
"Friendly but professional" tells a writer nothing, and it tells a model even less. Voice guidance only works when it's testable.
Replace adjectives with rules
- Name your product the same way every time. Write down which way.
- Set a sentence-length ceiling. Short sentences read as confident.
- List words you always use — and the ones you never use.
- Decide on contractions, exclamation marks and emoji once.
Include three lines you'd actually publish
Examples outperform description. Three real lines from your own site do more for voice fidelity than a page of adjectives.
Say what to avoid
A forbidden-phrase list is the fastest quality gain available. "Revolutionary", "game-changing", "unlock" — pick your own and ban them.
Keep it in the tool, not in a doc
A guide in a shared drive gets ignored. In Caplyn it lives in the brand profile and applies to every batch automatically.
Try it on your own site
Paste your URL and read the copy Caplyn writes in your voice. No account needed.
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