---
name: color-accessibility
description: >
  Design color palettes that are accessible to all users including those with
  color blindness. Ensure sufficient contrast, meaningful use of color, and
  inclusive design.
---

# Color Accessibility

## Table of Contents

- [Overview](#overview)
- [When to Use](#when-to-use)
- [Quick Start](#quick-start)
- [Reference Guides](#reference-guides)
- [Best Practices](#best-practices)

## Overview

Accessible color design ensures all users, including those with color vision deficiency, can access and understand information.

## When to Use

- Creating color palettes
- Designing data visualizations
- Testing interface designs
- Status indicators and alerts
- Form validation states
- Charts and graphs

## Quick Start

Minimal working example:

```yaml
WCAG Contrast Ratios:

WCAG AA (Minimum):
  - Normal text: 4.5:1
  - Large text (18pt+): 3:1
  - UI components & graphical elements: 3:1
  - Focus indicators: 3:1

WCAG AAA (Enhanced):
  - Normal text: 7:1
  - Large text: 4.5:1
  - Better for accessibility

---
Testing Contrast:

Tools:
  - WebAIM Contrast Checker
  - Color Contrast Analyzer
  - Figma plugins
  - Browser DevTools

Formula (WCAG): Contrast = (L1 + 0.05) / (L2 + 0.05)
  Where L = relative luminance

// ... (see reference guides for full implementation)
```

## Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents |
|---|---|
| [Color Contrast Standards](references/color-contrast-standards.md) | Color Contrast Standards |
| [Color Vision Deficiency Simulation](references/color-vision-deficiency-simulation.md) | Color Vision Deficiency Simulation |
| [Accessible Color Usage](references/accessible-color-usage.md) | Accessible Color Usage |
| [Testing & Validation](references/testing-validation.md) | Testing & Validation |

## Best Practices

### ✅ DO

- Ensure 4.5:1 contrast minimum (WCAG AA)
- Test with color blindness simulator
- Use patterns or icons with color
- Label states with text, not color alone
- Test with real users with color blindness
- Document color usage in design system
- Choose accessible color palettes
- Use sequential colors for ordered data
- Validate all color combinations
- Include focus indicators

### ❌ DON'T

- Use color alone to convey information
- Create low-contrast text
- Assume users see colors correctly
- Use red-green combinations
- Forget about focus states
- Mix too many colors (>5-8)
- Use pure red and pure green together
- Skip contrast testing
- Assume AA is sufficient (AAA better)
- Ignore color blindness in testing


---
Source attribution: aj-geddes
Original project: https://github.com/aj-geddes/useful-ai-prompts/blob/3f5182cfd739fc113f4af5244a1cf342ad7f7911/skills/color-accessibility/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2025 AJ Geddes

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


# Mega AI Hub resource metadata

Creator / publisher: aj-geddes
Original project: https://github.com/aj-geddes/useful-ai-prompts/blob/3f5182cfd739fc113f4af5244a1cf342ad7f7911/skills/color-accessibility/SKILL.md
Attribution basis: Source repository record

Fields of work: Design, Marketing
Roles: Content Marketer, Graphic Designer, Product Designer, UI Designer, UX Designer
Specialties: Design
Tools: Figma, Webaim Contrast Checker, Color Contrast Analyzer
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: c1dafc3a8bfe5737be724c064c48ef09a7ae9de669c6e7d0597f9dfa0283f473