# CircuitLab Brand Identity

A complete profile of **CircuitLab**'s visual system — colors, typography, components, and personality — extracted from https://www.circuitlab.com/. Built for designers, agents, and AI tools.

- Page: https://characterquilt.com/branding/circuitlab
- Machine-readable JSON: https://characterquilt.com/branding/circuitlab.json
- Per-page llms.txt: https://characterquilt.com/branding/circuitlab/llms.txt

## Quick Facts

| Field | Value |
|---|---|
| Primary | #4A5B68 |
| Accent | #5BB75B |
| Body Font | Helvetica Neue |
| Heading Font | Palatino Linotype |

## Color Palette

- primary: #4A5B68
- secondary: #5BB75B
- accent: #5BB75B
- background: #FFFFFF
- textPrimary: #0088CC
- link: #0088CC

## Typography

- primary: Helvetica Neue — https://fonts.google.com/specimen/Helvetica+Neue
- heading: Palatino Linotype — https://fonts.google.com/specimen/Palatino+Linotype

## Visual Assets

- Logo: https://www.circuitlab.com/assets/images/topbar_logo_60_2x.png
- Favicon: https://www.circuitlab.com/assets/images/favicon.png
- Social card (og:image): https://www.circuitlab.com/assets/images/og_logo.png

## UI Components

- input: background=#FFFFFF, textColor=#FFFFFF, borderColor=#111111, borderRadius=6px, shadow=rgba(0, 0, 0, 0.1) 0px 1px 2px 0px inset, rgba(255, 255, 255, 0.15) 0px 1px 0px 0px
- buttonPrimary: background=#5BB75B, textColor=#FFFFFF, borderColor=#E6E6E6, borderRadius=6px, shadow=rgba(255, 255, 255, 0.2) 0px 1px 0px 0px inset, rgba(0, 0, 0, 0.05) 0px 1px 2px 0px

## Brand Personality

Tone: professional · Energy: medium · Audience: engineers and electronics enthusiasts

## CircuitLab Brand in the Wild

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

- **Blog - CircuitLab**
  - Image: https://s3.amazonaws.com/circuitlab-images/misc/20120608-nerdkits-sous-vide-cooker-schematic.png
  - Source: https://www.circuitlab.com/blog/16/
- **Blog - CircuitLab**
  - Image: https://cdn.circuitlab.com/misc/20210127-live-dc-demo.gif
  - Source: https://www.circuitlab.com/blog/
- **Documentation - CircuitLab**
  - Image: https://cdn.circuitlab.com/misc/2021-04-14-simulation-troubleshooting-parameter-2.png
  - Source: https://www.circuitlab.com/docs/simulation-troubleshooting/
- **CircuitLab Conquering Classrooms - Blog - CircuitLab**
  - Image: https://s3.amazonaws.com/circuitlab-images/misc/20121029-upenn-electronics-lab.jpg
  - Source: https://www.circuitlab.com/blog/2012/10/29/circuitlab-conquering-classrooms/
- **CircuitLab in Google's Chrome Web Store - Blog - CircuitLab**
  - Image: https://s3.amazonaws.com/circuitlab-images/misc/20120403-chromewebstore.png
  - Source: https://www.circuitlab.com/blog/2012/04/03/circuitlab-in-googles-chrome-web-store/
- **Basic Math, TRMS, AVG, Mean - CircuitLab Support Forum - CircuitLab**
  - Image: http://i.imgur.com/YrqEcX4.png
  - Source: https://www.circuitlab.com/forums/support/topic/uz58jnx8/basic-math-trms-avg-mean/

## 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

```json
{
  "colorScheme": "light",
  "fonts": [
    {
      "family": "Helvetica Neue",
      "role": "body"
    },
    {
      "family": "Palatino Linotype",
      "role": "heading"
    }
  ],
  "colors": {
    "primary": "#4A5B68",
    "secondary": "#5BB75B",
    "accent": "#5BB75B",
    "background": "#FFFFFF",
    "textPrimary": "#0088CC",
    "link": "#0088CC"
  },
  "typography": {
    "fontFamilies": {
      "primary": "Helvetica Neue",
      "heading": "Palatino Linotype"
    },
    "fontStacks": {
      "heading": [
        "Helvetica Neue",
        "Helvetica",
        "Arial",
        "sans-serif"
      ],
      "body": [
        "Helvetica Neue",
        "Helvetica",
        "Arial",
        "sans-serif"
      ],
      "paragraph": [
        "Helvetica Neue",
        "Helvetica",
        "Arial",
        "sans-serif"
      ]
    },
    "fontSizes": {
      "h1": "44px",
      "h2": "24px",
      "body": "13px"
    }
  },
  "spacing": {
    "baseUnit": 4,
    "borderRadius": "4px"
  },
  "components": {
    "input": {
      "background": "#FFFFFF",
      "textColor": "#FFFFFF",
      "borderColor": "#111111",
      "borderRadius": "6px",
      "borderRadiusCorners": {
        "topLeft": "6px",
        "topRight": "6px",
        "bottomRight": "6px",
        "bottomLeft": "6px"
      },
      "shadow": "rgba(0, 0, 0, 0.1) 0px 1px 2px 0px inset, rgba(255, 255, 255, 0.15) 0px 1px 0px 0px"
    },
    "buttonPrimary": {
      "background": "#5BB75B",
      "textColor": "#FFFFFF",
      "borderColor": "#E6E6E6",
      "borderRadius": "6px",
      "borderRadiusCorners": {
        "topLeft": "6px",
        "topRight": "6px",
        "bottomRight": "6px",
        "bottomLeft": "6px"
      },
      "shadow": "rgba(255, 255, 255, 0.2) 0px 1px 0px 0px inset, rgba(0, 0, 0, 0.05) 0px 1px 2px 0px"
    }
  },
  "images": {
    "logo": "https://www.circuitlab.com/assets/images/topbar_logo_60_2x.png",
    "favicon": "https://www.circuitlab.com/assets/images/favicon.png",
    "ogImage": "https://www.circuitlab.com/assets/images/og_logo.png",
    "logoHref": "/",
    "logoAlt": "CircuitLab"
  },
  "__llm_logo_reasoning": {
    "selectedIndex": 0,
    "reasoning": "Selected #0 because it is visible, medium-sized, and links to the homepage. The alt text matches the brand name 'CircuitLab', making it the primary logo.",
    "confidence": 0.95,
    "source": "llm"
  },
  "__llm_button_reasoning": {
    "primary": {
      "index": 0,
      "text": "Launch CircuitLab",
      "reasoning": "Button #0 is the primary CTA because it uses a vibrant green color (#5BB75B) which is typically used for primary actions. The text 'Launch CircuitLab' is action-oriented, indicating a primary function."
    },
    "secondary": {
      "index": -1,
      "text": "N/A",
      "reasoning": "Both buttons share the same color and text, making it impossible to distinguish a secondary button based on the provided data."
    },
    "confidence": 0.9
  },
  "personality": {
    "tone": "professional",
    "energy": "medium",
    "targetAudience": "engineers and electronics enthusiasts"
  },
  "designSystem": {
    "framework": "bootstrap",
    "componentLibrary": ""
  },
  "confidence": {
    "buttons": 0.9,
    "colors": 0.9,
    "overall": 0.9
  },
  "__llm_metadata": {
    "logoSelection": {
      "llmCalled": true,
      "llmSucceeded": true,
      "finalSource": "llm",
      "rawLogoSelection": {
        "selectedLogoIndex": 0,
        "selectedLogoReasoning": "Selected #0 because it is visible, medium-sized, and links to the homepage. The alt text matches the brand name 'CircuitLab', making it the primary logo.",
        "confidence": 0.95
      }
    },
    "buttonClassification": {
      "llmCalled": true,
      "llmSucceeded": true
    }
  }
}
```