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ColorFYI

Comprehensive color reference for developers and designers. 16.7M hex colors computed on-the-fly, 809 named colors (CSS, X11, Crayola, Pantone, RAL, NCS), 544 brand color palettes, 103 color theory glossary terms, 215 blog articles, and 6 interactive tools (WCAG contrast, converter, palette generator, shade generator, color blindness simulator, gradient generator).

For agents: Color reference for developers and designers: 16.7M hex colors, 809 named colors, brand palettes, WCAG contrast and palette tools.

color referencehex colorswcag contrastcolor palette generatornamed colors

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T14:51:59.540Z. Cached copy · Source on colorfyi.com

# ColorFYI

> Comprehensive color reference for developers and designers. 16.7M hex colors computed on-the-fly, 809 named colors (CSS, X11, Crayola, Pantone, RAL, NCS), 544 brand color palettes, 103 color theory glossary terms, 215 blog articles, and 6 interactive tools (WCAG contrast, converter, palette generator, shade generator, color blindness simulator, gradient generator).

## Data Scope
- 16.7M hex colors with RGB, HSL, HSV, CMYK, OKLCH values computed on-the-fly (<1ms)
- 809 named colors across 9 sources: CSS, X11, Crayola, Pantone, RAL, NCS, Brand, Cultural, Custom
- 544 brand color palettes (484 regular + 60 crypto) with 1,335 individual brand colors
- 23+ themed color collections (Pantone, Tailwind CSS, Radix UI, Ant Design, Obangsaek, Japanese Traditional)
- 103 color theory glossary terms with definitions and related resources
- 139 color name glossary entries with etymology, history, and cultural significance
- 215 blog articles across 8 categories (color theory, brand stories, design guides)
- 15 curated color palettes
- 6 interactive tools: WCAG Contrast Checker, Color Converter, Palette Generator, Shade Generator, Color Blindness Simulator, Gradient Generator
- Color harmonies: complementary, triadic, tetradic, split-complementary, analogous
- WCAG 2.1 contrast ratio with AA/AAA compliance checks
- Tailwind-style shade scales (50-950) for any color
- Color blindness simulation: deuteranopia, protanopia, tritanopia

## URL Patterns
- Append `.md` to any URL for plain-text markdown format.
- i18n: URL prefix `/{lang}` for non-English (ko, ja, zh-hans, es, fr, de, pt, ru, vi, tr, ar, hi, th, id).
- `/color/{hex}/` — Color detail page for any 6-digit hex (e.g. `/color/FF6B35/`)
- `/color/{slug}/` — Named color by slug (e.g. `/color/cerulean/`)
- `/color/named/` — Browse all 809 named colors with source filter (e.g. `/color/named/`)
- `/color/rgb-{R}-{G}-{B}/` — RGB redirect to hex detail (e.g. `/color/rgb-14-165-233/`)
- `/color/hsl-{H}-{S}-{L}/` — HSL redirect to hex detail (e.g. `/color/hsl-199-89-48/`)
- `/family/` — Color families (red, blue, green, ...) (e.g. `/family/`)
- `/family/{slug}/` — Color family detail (e.g. `/family/red/`)
- `/tone/` — Color tones (pastel, neon, earth, ...) (e.g. `/tone/`)
- `/tone/{slug}/` — Color tone detail (e.g. `/tone/pastel/`)
- `/design-system/` — Design system color palettes (e.g. `/design-system/`)
- `/design-system/{slug}/` — Design system detail (e.g. `/design-system/tailwind/`)
- `/meaning/` — Color meanings and symbolism (e.g. `/meaning/`)
- `/meaning/{slug}/` — Color meaning detail (e.g. `/meaning/romantic/`)
- `/brands/` — Brand color palettes grouped by category (e.g. `/brands/`)
- `/brands/{slug}/` — Brand color palette detail (e.g. `/brands/google/`)
- `/brands/category/{cat}/` — Brand category page (e.g. `/brands/category/tech/`)
- `/collections/` — Themed color collections (e.g. `/collections/`)
- `/collections/{slug}/` — Collection detail (e.g. `/collections/korean-obangsaek/`)
-
…

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