simplex.json

Simplex Brand Identity

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

Quick Facts

Field Value
Primary #1E293B
Accent #6366F1
Body Font Segoe UI
Heading Font Segoe UI

Color Palette

Typography

Visual Assets

UI Components

Brand Personality

Tone: professional · Energy: medium · Audience: healthcare professionals

Simplex 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:

CharacterQuilt.com suggests this flow that can help:

  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": "Segoe UI",
      "role": "body"
    },
    {
      "family": "Roboto",
      "role": "body"
    },
    {
      "family": "Open Sans",
      "role": "body"
    },
    {
      "family": "Helvetica Neue",
      "role": "body"
    },
    {
      "family": "Ubuntu",
      "role": "body"
    }
  ],
  "colors": {
    "primary": "#1E293B",
    "secondary": "#374151",
    "accent": "#6366F1",
    "background": "#FFFFFF",
    "textPrimary": "#6366F1",
    "link": "#6366F1"
  },
  "typography": {
    "fontFamilies": {
      "primary": "Segoe UI",
      "heading": "Segoe UI"
    },
    "fontStacks": {
      "heading": [
        "GeistSans",
        "GeistSans Fallback",
        "-apple-system",
        "BlinkMacSystemFont",
        "Segoe UI",
        "Roboto",
        "Oxygen",
        "Ubuntu",
        "Cantarell",
        "Open Sans",
        "Helvetica Neue",
        "sans-serif"
      ],
      "body": [
        "-apple-system",
        "BlinkMacSystemFont",
        "Segoe UI",
        "Roboto",
        "Oxygen",
        "Ubuntu",
        "Cantarell",
        "Open Sans",
        "Helvetica Neue",
        "sans-serif"
      ],
      "paragraph": [
        "GeistSans",
        "GeistSans Fallback",
        "-apple-system",
        "BlinkMacSystemFont",
        "Segoe UI",
        "Roboto",
        "Oxygen",
        "Ubuntu",
        "Cantarell",
        "Open Sans",
        "Helvetica Neue",
        "sans-serif"
      ]
    },
    "fontSizes": {
      "h1": "48px",
      "h2": "60px",
      "body": "12px"
    }
  },
  "spacing": {
    "baseUnit": 4,
    "borderRadius": "3px"
  },
  "components": {
    "buttonPrimary": {
      "background": "#6366F1",
      "textColor": "#FFFFFF",
      "borderRadius": "0px",
      "borderRadiusCorners": {
        "topLeft": "0px",
        "topRight": "0px",
        "bottomRight": "0px",
        "bottomLeft": "0px"
      },
      "shadow": "rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 1px 2px 0px"
    },
    "buttonSecondary": {
      "background": "#FFFFFF",
      "textColor": "#6366F1",
      "borderRadius": "0px",
      "borderRadiusCorners": {
        "topLeft": "0px",
        "topRight": "0px",
        "bottomRight": "0px",
        "bottomLeft": "0px"
      },
      "shadow": "rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.05) 0px 1px 2px 0px"
    }
  },
  "images": {
    "logo": null,
    "favicon": null,
    "ogImage": "https://simplex.sh/og-image.png"
  },
  "__llm_button_reasoning": {
    "primary": {
      "index": 0,
      "text": "Get Access",
      "reasoning": "Button #0 has a vibrant blue background (#6366F1), which is the brand's accent color, and the text 'Get Access' is action-oriented, making it the primary CTA."
    },
    "secondary": {
      "index": 1,
      "text": "Get Access",
      "reasoning": "Button #1 has a different background color (#FFFFFF) and serves as a secondary option with the same text 'Get Access', but in a less prominent style."
    },
    "confidence": 0.95
  },
  "personality": {
    "tone": "professional",
    "energy": "medium",
    "targetAudience": "healthcare professionals"
  },
  "designSystem": {
    "framework": "tailwind",
    "componentLibrary": ""
  },
  "confidence": {
    "buttons": 0.95,
    "colors": 0.9,
    "overall": 0.925
  },
  "__llm_metadata": {
    "logoSelection": {
      "llmCalled": false,
      "llmSucceeded": false,
      "finalSource": "none"
    },
    "buttonClassification": {
      "llmCalled": true,
      "llmSucceeded": true
    }
  }
}