Zenn / Use your brand with AI

Use your brand in ChatGPT and Claude

AI tools are great at writing posts, emails and web pages, but they guess at your colours and voice. Every Zenn Brand kit now includes brand.json: your whole brand in one file an AI can follow exactly.

Make my brand kit

What’s in brand.json

Your colours with their names, roles and HEX, RGB and CMYK values. Your heading and body fonts and how to use them. Your tone of voice, with what to be and what not to be. Your logo rules: clear space, minimum sizes and the mistakes to avoid.

It also lists every file in your kit, so an AI (or a designer) knows exactly which logo to use where. It sits next to your brand guide in the Brand kit download.

{
  "format": "zenn-brand/1",
  "name": "Orbit Labs",
  "tagline": "Software that just works.",
  "colours": [
    { "name": "Signature Purple", "role": "primary", "hex": "#6A2BD9",
      "use": "Buttons, links and the one thing you want people to notice" },
    { "name": "Soft Purple", "role": "secondary", "hex": "#E7DDF9" },
    { "name": "Ink", "role": "text", "hex": "#1D1D1F" }
  ],
  "fonts": {
    "headings": { "family": "Montserrat" },
    "body": { "family": "Zenn Rounded Light" }
  },
  "voice": { "values": ["Clear", "Friendly", "Reliable"] },
  "logo": {
    "clear_space": "Equal to the height of the mark",
    "minimum_size": { "screen": "24 px high", "print": "8 mm high" },
    "dont": ["Stretch or squash it", "Change the colours", "Rotate it"]
  },
  "files": { "logo": ["Logo/logo.svg", "Logo/logo-transparent.png"] }
}

Set it up once, stay on brand for ever

  1. ChatGPT

    Open ChatGPT and create a Project (or a custom GPT) for your business. Add brand.json and logo-transparent.png as project files, and paste the prompt below into the project instructions. Every chat in that project now knows your brand.

  2. Claude

    In Claude, create a Project, add brand.json to the project knowledge and paste the prompt below as the project instructions. Ask for posts, emails or web pages and Claude uses your colours, fonts and voice.

  3. Gemini and others

    Any AI tool that takes a file works: attach brand.json at the start of the chat, then paste the prompt. For tools that only take text, paste the contents of brand.json straight into the chat.

Here is my brand as brand.json. Follow it for everything you make for me: use only these colours (with their roles), these fonts, this tone of voice and these logo rules. If something isn’t covered, ask me.

What to ask for

Social posts

Captions in your tone of voice, with hashtags and your handle, and image ideas in your colours.

Websites

Ask for a landing page and get HTML and CSS with your exact hex colours and fonts.

Emails and ads

Newsletters, offers and ad copy that sound like you every time, not like a robot.

Briefs for people

Send brand.json to a designer, developer or printer so they have every rule in one file.

Don’t have a brand yet?

Type your business name and Zenn designs your logo and a 150+ design brand kit in seconds, free to try. The Brand kit, with brand.json, is $96 a year.

Design my brand

Questions

What is brand.json?

A small text file in every Zenn Brand kit download. It holds your brand as data: colours with their roles and HEX, RGB and CMYK values, your heading and body fonts, your tone of voice, your logo rules (clear space, minimum sizes, what not to do) and a list of every file in your kit. AI tools and developers can read it directly.

How do I make ChatGPT use my brand colours?

Give it the exact values. Add brand.json to a ChatGPT Project or custom GPT and tell it to follow the file for everything it makes. Without exact HEX codes, AI tools guess at your colours and drift a little each time.

Does it work with Claude?

Yes. Add brand.json to a Claude Project and paste the prompt on this page into the project instructions. Claude reads JSON well and will use your colours, fonts and voice in posts, emails and code.

Where do I find brand.json?

In the main folder of your Brand kit .zip, next to the 1-page brand guide, with a short note called ‘Use your brand with AI’. Already a customer? Download your kit again from your Zenn account to get it.

Is brand.json in the Premium logo too?

brand.json comes with the Brand kit ($96 a year), which also includes 150+ designs and the 15-page brand guide. Premium logos include a 1-page brand guide.

Can AI tools use my logo file?

Tools that take images can: attach logo-transparent.png from the Logo folder. For web pages, ask the AI to reference logo.svg by its file name and add the file yourself.