How do I make AI write in my brand voice?

You've tried the "write in a professional but friendly tone" approach. It doesn't work. Every brand says that, so every output sounds the same.

Why tone instructions fail

"Professional but friendly" is meaningless to an AI. So is "casual but authoritative" or "warm but direct." These descriptions are too vague to produce anything distinctive. They're the equivalent of telling a chef to make something "good."

What actually works: a voice recipe

A voice recipe blends specific cultural references into a one-sentence tonal fingerprint. Instead of vague adjectives, you give the AI concrete voices to channel:

"Anthony Bourdain's directness meets Mailchimp's warmth, but for B2B SaaS — and slightly self-aware about how boring the category is."

Now the AI has something to work with. It knows the rhythm (Bourdain's short sentences), the energy (Mailchimp's approachability), and the twist (the self-awareness). That combination is unique to YOUR brand.

The three ingredients

1. Voice anchors — 2-3 references from celebrities, brands, or cultural vibes that capture your energy 2. Anti-patterns — what you explicitly refuse to sound like (corporate, salesy, startup bro) 3. The quirk — the one specific thing that makes your voice human and imperfect

How to use it

Paste your voice recipe at the top of any AI prompt. "Write this in the following voice: [recipe]." The output will be noticeably different from generic AI copy. Not perfect — but yours.