f4.json

F4 Brand Identity

A complete profile of F4's visual system — colors, typography, components, and personality — extracted from https://f4.dev/. Built for designers, agents, and AI tools.

Quick Facts

Field Value
Primary #71621B
Accent #F2CF2F
Body Font SF Pro Display
Heading Font SF Pro Display

Color Palette

Typography

Visual Assets

UI Components

Brand Personality

Tone: professional · Energy: medium · Audience: engineers and technical professionals

F4 Brand in the Wild

Real-world brand assets — ads, campaigns, marketing materials.

Working with these fonts

Not found on Google Fonts? Agent Instructions that you can follow if you have permission to use the fonts:

  1. Open the company's homepage in a browser with DevTools open.
  2. In the Network tab, filter by "Font" (or by extension: woff2, woff, ttf, otf).
  3. Hard-reload the page and click around (pricing, blog, careers) — some weights only load on specific routes.
  4. For each captured font URL: right-click → Save As to download the file locally.
  5. View the page's CSS (DevTools → Sources, or curl the stylesheet URLs) and copy out the matching @font-face declarations. Rewrite each src: url(...) to point to your local file path.

Programmatic alternative: load the URL with Playwright or Puppeteer, listen for response events whose Content-Type starts with font/, and write the body to disk. The CSS extraction step is the same.

Only do this if you have permission to use the brand assets — most proprietary fonts are licensed and may not be redistributable.

Machine-Readable Profile

{
  "colorScheme": "dark",
  "fonts": [
    {
      "family": "SF Pro Display",
      "role": "body"
    },
    {
      "family": "SF Pro",
      "role": "body"
    },
    {
      "family": "SF Mono",
      "role": "monospace"
    },
    {
      "family": "Fira Code",
      "role": "monospace"
    },
    {
      "family": "Segoe UI",
      "role": "body"
    }
  ],
  "colors": {
    "primary": "#71621B",
    "secondary": "#4A4014",
    "accent": "#F2CF2F",
    "background": "#08090A",
    "textPrimary": "#08090A",
    "link": "#F2CF2F"
  },
  "typography": {
    "fontFamilies": {
      "primary": "SF Pro Display",
      "heading": "SF Pro Display"
    },
    "fontStacks": {
      "heading": [
        "-apple-system",
        "BlinkMacSystemFont",
        "SF Pro Display",
        "SF Pro",
        "Segoe UI",
        "system-ui",
        "sans-serif"
      ],
      "body": [
        "-apple-system",
        "BlinkMacSystemFont",
        "SF Pro Display",
        "SF Pro",
        "Segoe UI",
        "system-ui",
        "sans-serif"
      ],
      "paragraph": [
        "-apple-system",
        "BlinkMacSystemFont",
        "SF Pro Display",
        "SF Pro",
        "Segoe UI",
        "system-ui",
        "sans-serif"
      ]
    },
    "fontSizes": {
      "h1": "60px",
      "h2": "60px",
      "body": "18px"
    }
  },
  "spacing": {
    "baseUnit": 4,
    "borderRadius": "28px"
  },
  "components": {
    "buttonPrimary": {
      "background": "#141515",
      "textColor": "#08090A",
      "borderColor": "#71621B",
      "borderRadius": "9999px",
      "borderRadiusCorners": {
        "topLeft": "9999px",
        "topRight": "9999px",
        "bottomRight": "9999px",
        "bottomLeft": "9999px"
      },
      "shadow": "rgba(242, 207, 47, 0.18) 0px 18px 48px 0px"
    },
    "buttonSecondary": {
      "background": "transparent",
      "textColor": "#08090A",
      "borderColor": "#71621B",
      "borderRadius": "9999px",
      "borderRadiusCorners": {
        "topLeft": "9999px",
        "topRight": "9999px",
        "bottomRight": "9999px",
        "bottomLeft": "9999px"
      },
      "shadow": "rgba(242, 207, 47, 0.18) 0px 18px 48px 0px"
    }
  },
  "images": {
    "logo": "data:image/svg+xml,%3csvg%20xmlns='http://www.w3.org/2000/svg'%20width='100%25'%20height='100%25'%20viewBox='0%200%2016%2016'%20role='img'%20aria-label='F4%20Logo'%3e%3c!--%20Simplified%20for%20QtSvg%20compatibility:%20use%206-digit%20hex%20colors%20(QtSvg%20may%20ignore%208-digit)%20--%3e%3ctitle%3eF4%20Logo%3c/title%3e%3cpath%20fill='%23ffffff'%20d='M5.879%208.83c.76%200%201.378.617%201.376%201.378l-.011%205.797H5.386V13.85a.43.43%200%200%200-.43-.43h-2.53v-1.525h2.537a.43.43%200%200%200%20.43-.431v-.724a.43.43%200%200%200-.43-.43H.002V8.83h5.877Zm10.142%201.48H11.06a.43.43%200%200%200-.43.43v.724c0%20.237.193.43.43.43h2.538v1.526h-2.53a.43.43%200%200%200-.43.43v2.155h-1.86l-.012-5.797a1.377%201.377%200%200%201%201.377-1.379h5.877v1.481Zm-5.385-8.15c0%20.238.194.43.431.43h2.53v1.525H11.06a.43.43%200%200%200-.43.43v.725c0%20.237.193.43.43.43h4.962v1.482h-5.877a1.377%201.377%200%200%201-1.377-1.38L8.78.005h1.857V2.16Zm-3.38%203.642A1.377%201.377%200%200%201%205.878%207.18H.002V5.699h4.962a.43.43%200%200%200%20.43-.43v-.723a.43.43%200%200%200-.43-.43h-2.54V2.59h2.53a.43.43%200%200%200%20.431-.43V.005h1.858l.011%205.797Z'/%3e%3c/svg%3e",
    "favicon": "https://f4.dev/favicon.svg",
    "ogImage": "https://f4.dev/social/og-default-1200x630.png",
    "logoHref": "/",
    "logoAlt": "F4"
  },
  "__llm_logo_reasoning": {
    "selectedIndex": 0,
    "reasoning": "Selected #0 because it is located in the header, is visible, and links to the homepage, matching the brand 'F4 Industries'.",
    "confidence": 0.9,
    "source": "llm"
  },
  "__llm_button_reasoning": {
    "primary": {
      "index": 1,
      "text": "Contact Sales",
      "reasoning": "Button #1 'Contact Sales' is marked as primary and has a distinct background color (#141515) with a border color matching the primary brand color (#71621B), indicating its importance as a CTA."
    },
    "secondary": {
      "index": 5,
      "text": "Go to Downloads",
      "reasoning": "Button #5 'Go to Downloads' has a transparent background, making it a suitable secondary action with a different color group from the primary button."
    },
    "confidence": 0.9
  },
  "personality": {
    "tone": "professional",
    "energy": "medium",
    "targetAudience": "engineers and technical professionals"
  },
  "designSystem": {
    "framework": "custom",
    "componentLibrary": ""
  },
  "confidence": {
    "buttons": 0.9,
    "colors": 0.95,
    "overall": 0.925
  },
  "__llm_metadata": {
    "logoSelection": {
      "llmCalled": true,
      "llmSucceeded": true,
      "finalSource": "llm",
      "rawLogoSelection": {
        "selectedLogoIndex": 0,
        "selectedLogoReasoning": "Selected #0 because it is located in the header, is visible, and links to the homepage, matching the brand 'F4 Industries'.",
        "confidence": 0.9
      }
    },
    "buttonClassification": {
      "llmCalled": true,
      "llmSucceeded": true
    }
  }
}