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Category Graphic Generators

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About

Plain text lists communicate nothing about hierarchy, priority, or category. A flat bullet list forces the reader to parse every item linearly. Color-coded lists solve this by mapping visual channels (hue, saturation) to semantic meaning. This tool generates lists where each item carries its own background color, computed via HSL rotation to guarantee perceptual distinctness. The contrast ratio between text and background is calculated using the WCAG relative luminance formula: L = 0.2126R + 0.7152G + 0.0722B, ensuring text remains readable at a minimum ratio of 4.5:1. Items are reorderable via drag-and-drop. The tool approximates design intent for non-designers. It does not replace a full layout editor. Export is limited to single-level flat lists.

Formulas

Each item's auto-generated color is distributed evenly across the hue wheel using the golden angle to maximize perceptual separation between adjacent items:

H_i = (H₀ + i × 137.508) mod 360

where H₀ is the starting hue and 137.508° is the golden angle. Text color is selected by computing relative luminance of the background:

L = 0.2126 × R_lin + 0.7152 × G_lin + 0.0722 × B_lin

where each linearized channel is C_lin = (C_sRGB ÷ 255)^2.2. If L > 0.179, text is set to dark (#2D3436). Otherwise, text is white (#FFFFFF). The contrast ratio CR = L_lighter + 0.05L_darker + 0.05 must meet or exceed 4.5:1 per WCAG 2.1 AA.

Reference Data

Color Scheme	Hue Range	Use Case	Saturation	Lightness
Pastel Rainbow	0° - 360°	General lists, brainstorming	65%	80%
Warm Tones	0° - 60°	Urgency, action items	70%	78%
Cool Tones	180° - 270°	Calm, informational	60%	82%
Earth Tones	20° - 50°	Natural, organic themes	45%	75%
Monochrome Blue	210° - 230°	Corporate, professional	50%	70% - 90%
Monochrome Green	120° - 150°	Eco, health, progress	50%	72% - 88%
Sunset Gradient	0° - 45°	Creative, artistic	75%	76%
Neon Pastel	0° - 360°	Youth, fun, playful	80%	85%
Ocean	170° - 220°	Travel, maritime	55%	74%
Berry	280° - 340°	Fashion, luxury	60%	78%
Custom	User-defined	Any specific branding	User-defined	User-defined

Frequently Asked Questions

The golden angle (137.508°) is derived from the golden ratio and guarantees that no two consecutive hues land near each other on the 360° color wheel. After 5 items, the maximum gap between any two hues is less than 50°, creating visually distinct bands. This outperforms simple equal-division (360° ÷ n) because it works well even when the total number of items is unknown in advance.

The tool computes relative luminance of each item's background using the sRGB-to-linear conversion with a gamma of 2.2. When luminance exceeds the threshold of 0.179, dark text (#2D3436) provides sufficient contrast. Below that threshold, the background is too dark for dark text to meet the WCAG 4.5:1 contrast ratio, so white text is used instead. This is automatic and cannot be overridden to prevent accessibility violations.

Use the HTML export. It generates a self-contained

element, including background-color, color, border-radius, and padding. This can be pasted directly into any HTML document or CMS editor. The Markdown export works for GitHub READMEs and documentation but loses color information since Markdown does not support inline styles.

Yes. Click any item's color swatch to open a color picker and set an exact hex value. You can also select the "Custom" color scheme preset, which disables auto-coloring and lets you control every item individually. For brand consistency, set your primary brand color as the first item, then use the "Monochrome" scheme to generate lightness variations of that single hue.

Yes. Focus an item's drag handle using Tab, then press Space or Enter to pick it up. Use Arrow Up and Arrow Down to move the item, then press Space or Enter again to drop it. Press Escape to cancel. Screen readers receive aria-live announcements for each move describing the item's new position (e.g., 'Item moved to position 3 of 7').

The tool handles up to 200 items without noticeable lag. Beyond that, DOM re-renders during drag-and-drop may introduce frame drops. The undo history is capped at 50 states to limit memory consumption. Each state is a deep-cloned array, so at 200 items with 50 history entries, memory usage stays under 5 MB.