Color reference

#63637B color reference

Muted Mid-light Violet

This is a muted, mid-light violet under the deterministic OKLCH hue, lightness, and chroma ranges. Its closest standardized CSS named color is Dim Gray (#696969), measured with straight-line OKLab distance.

Descriptive label
Muted Mid-light Violet
Recommended text
White · 5.83:1
Relative luminance
0.130064
Build a palette from #63637B in Palette Generator Convert #63637B in Color Converter
Formats UI preview Contrast 50–900 scale Harmonies Matches Related colors Color vision Exports

Copyable values

#63637B in common color formats

Values are calculated from the same opaque sRGB color. Display rounding does not alter the internal calculations.

Color conversions for #63637B
Format Value Action
HEX #63637B
RGB rgb(99 99 123)
HSL hsl(240 10.81% 43.53%)
HSV hsv(240 19.51% 48.24%)
HWB hwb(240 38.82% 51.76%)
XYZ D65 color(xyz-d65 0.131819 0.130063 0.205555)
LAB lab(42.6447% 4.1267 -13.5038)
LCH lch(42.6447% 14.1202 286.993)
OKLAB oklab(50.869% 0.009773 -0.03653)
OKLCH oklch(50.869% 0.037815 284.9772)

Real-world test

Try #63637B on interface components

Preview the source as a primary action, subtle status, form treatment, and card surface. Persistent state controls help touch and keyboard users inspect the same normal, hover, and active colors.

Normal state uses #63637B with white text at 5.83:1.

Action

Primary button

Use the controls above or point to and press the button to inspect its visual states.

Status

Subtle alert badge

A 12% source tint over white provides the background; readable text is selected separately.

Ready for review

Form

Border and focus ring

Source ring on white: 5.83:1 · meets the 3:1 non-text threshold where applicable.

Surface

Card component

The selected state becomes the card surface with its strongest black-or-white text pairing.

Design system Color decision ready Review states and surrounding surfaces before shipping.

Accessibility diagnostics

WCAG contrast for exact color pairs

Each result applies only to the named foreground, background, text size, and requirement. It is not a complete accessibility or component-conformance claim.

Source #63637B Exact pair assessment Results for source text on white appear below.

On white

5.83:1

  • Pass AA normal text · 4.5:1
  • Fail AAA normal text · 7:1
  • Pass AA large text · 3:1
  • Pass UI/non-text where applicable · 3:1
Source #63637B Exact pair assessment Results for source text on black appear below.

On black

3.6:1

  • Fail AA normal text · 4.5:1
  • Fail AAA normal text · 7:1
  • Pass AA large text · 3:1
  • Pass UI/non-text where applicable · 3:1

Use guidance

What this color may be suitable for

Pass in a tested context

Normal-sized text

#63637B reaches 5.58:1 on Hue Codex paper, meeting WCAG AA for normal text in that exact pairing.

Potential fit

Controls and interface graphics

Against Hue Codex paper, the color reaches 5.58:1. That meets the 3:1 color-contrast threshold where WCAG 1.4.11 applies, but states, shape, and non-color cues still need review.

Readable pairing available

Colored surface or button fill

White text provides the stronger black/white pairing on #63637B at 5.83:1. This validates only that text pair, not hover, focus, disabled, or adjacent-color states.

Restrained neutral

Palette role

Its OKLCH chroma of 0.0378 is restrained, which is generally more suitable for surfaces, borders, or neutral system roles than for a vivid accent.

Pair available

Color used as foreground

The stronger black/white background is white at 5.83:1. Always retest against the actual rendered background and text size.

Tested backgrounds

Foreground pairing comparison

#63637B foreground contrast on tested backgrounds
Pair Background Contrast ratio
White#FFFFFF 5.83:1
Hue Codex paper#FBFAF5 5.58:1
Soft neutral#F2EFE6 5.07:1
Black#000000 3.6:1
Hue Codex ink#10212B 2.83:1
Check #63637B on another background in Contrast Checker

Design-system starting point

A perceptual 50–900 reference scale

The source color is preserved at the nearest lightness step. Other swatches keep its OKLCH hue, moderate chroma toward the extremes, and reduce chroma only when needed to remain in sRGB.

50
100
200
300
400
500
600 #63637B Source
700
800
900 #222233

This is a Hue Codex reference scale, not a claim that the values match Tailwind, Material, or another framework’s named palette.

Adjust the #63637B scale in Tints, Shades & Tones

Color relationships

Complementary, analogous, and triadic colors

Hue rotations use OKLCH while preserving lightness and requested chroma. When a rotated result falls outside sRGB, chroma is reduced deterministically and disclosed.

Complementary

Source #63637B
Complement

Analogous

Source #63637B
Analogous −30°
Analogous +30°

Triadic

Source #63637B
Triad +120°
Triad +240°

Applied pairing

A small interface check

The source anchors the main action while the complement marks a secondary status. Contrast is selected separately for each fill.

Project color Muted Mid-light Violet
Complement
Explore #63637B in Color Harmonies

Distance matching

Closest standardized and framework colors

Matches use straight-line OKLab distance ×100. A smaller value means the coordinates are closer in this model; it is not a claim that two tokens are interchangeable in a design system.

CSS named color

Dim Gray

#696969

OKLab distance ×100: 3.97

Tailwind v4 default

mauve-500

oklch(54.2% 0.034 322.5)

OKLab distance ×100: 4.07 · sRGB preview #79697B

Print boundary

Pantone match not estimated

Reliable print matching needs licensed reference data plus a defined ink, paper, profile, and viewing condition.

Read the print methodology

Color-vision screening

Approximate color-vision-deficiency views

These encoded-sRGB matrix previews are screening approximations. They help reveal possible color-only distinctions but do not reproduce every person’s vision or establish accessibility conformance.

Original#63637B
Approx.

Protanopia

Red-vision deficiency approximation

Original#63637B
Approx.

Deuteranopia

Green-vision deficiency approximation

Original#63637B
Approx.

Tritanopia

Blue-yellow deficiency approximation

Original#63637B
Approx.#666666

Achromatopsia

Monochromatic-vision approximation

Test #63637B with a complete palette in the CVD Simulator

Ready to use

Copy framework-ready color tokens

Exports preserve the source, readable foreground, and generated 50–900 scale. Tailwind v4 CSS-first and Tailwind v3 JavaScript-config formats are labeled separately.

CSS custom properties

Semantic aliases and the complete 50–900 scale.

:root {
  --color-primary: #63637B;
  --color-on-primary: #FFFFFF;
  --color-primary-oklch: oklch(50.869% 0.037815 284.9772);
  --color-primary-50: #F4F4FF;
  --color-primary-100: #DCDCEE;
  --color-primary-200: #C2C2D6;
  --color-primary-300: #A8A9BE;
  --color-primary-400: #9090A6;
  --color-primary-500: #78788F;
  --color-primary-600: #63637B;
  --color-primary-700: #4B4B60;
  --color-primary-800: #363649;
  --color-primary-900: #222233;
}

Tailwind v4 CSS-first theme

Current @theme syntax for bg-brand, text-brand, and scale utilities.

@import "tailwindcss";

@theme {
  --color-brand: #63637B;
  --color-brand-foreground: #FFFFFF;
  --color-brand-50: #F4F4FF;
  --color-brand-100: #DCDCEE;
  --color-brand-200: #C2C2D6;
  --color-brand-300: #A8A9BE;
  --color-brand-400: #9090A6;
  --color-brand-500: #78788F;
  --color-brand-600: #63637B;
  --color-brand-700: #4B4B60;
  --color-brand-800: #363649;
  --color-brand-900: #222233;
}

Tailwind v3 / legacy config

CommonJS theme.extend.colors for JavaScript-config projects.

module.exports = {
  theme: {
    extend: {
      colors: {
        brand: {
          '50': '#F4F4FF',
          '100': '#DCDCEE',
          '200': '#C2C2D6',
          '300': '#A8A9BE',
          '400': '#9090A6',
          '500': '#78788F',
          '600': '#63637B',
          '700': '#4B4B60',
          '800': '#363649',
          '900': '#222233',
          DEFAULT: '#63637B',
          foreground: '#FFFFFF',
        },
      },
    },
  },
};

Sass variables

Semantic source, foreground, OKLCH, and scale variables.

$color-primary: #63637B;
$color-on-primary: #FFFFFF;
$color-primary-oklch: oklch(50.869% 0.037815 284.9772);
$color-primary-50: #F4F4FF;
$color-primary-100: #DCDCEE;
$color-primary-200: #C2C2D6;
$color-primary-300: #A8A9BE;
$color-primary-400: #9090A6;
$color-primary-500: #78788F;
$color-primary-600: #63637B;
$color-primary-700: #4B4B60;
$color-primary-800: #363649;
$color-primary-900: #222233;

Modern color-mix()

Static fallbacks followed by OKLab tint and shade declarations.

:root {
  --color-primary: #63637B;
  --color-primary-tint: #C2C2D6;
  --color-primary-tint: color-mix(in oklab, var(--color-primary) 72%, white);
  --color-primary-shade: #4B4B60;
  --color-primary-shade: color-mix(in oklab, var(--color-primary) 82%, black);
}

JSON design data

Source formats, readable text, and the generated scale.

{
    "name": "Muted Mid-light Violet",
    "hex": "#63637B",
    "rgb": "rgb(99 99 123)",
    "oklch": "oklch(50.869% 0.037815 284.9772)",
    "recommendedText": "#FFFFFF",
    "scale": {
        "50": "#F4F4FF",
        "100": "#DCDCEE",
        "200": "#C2C2D6",
        "300": "#A8A9BE",
        "400": "#9090A6",
        "500": "#78788F",
        "600": "#63637B",
        "700": "#4B4B60",
        "800": "#363649",
        "900": "#222233"
    }
}

Continue the decision

Use #63637B in a complete workflow

Reference values are a starting point. Test the color in its real role, background, states, typography, and surrounding palette before shipping.

Adjust #63637B in Color PickerStart with this exact color and white as the working background for role and accessibility decisions. Build a palette from #63637B in Palette GeneratorUse this exact HEX as the seed for a deterministic, role-based palette. Check #63637B on white in Contrast CheckerStart with this color as the foreground and white as the background, then test the real pair.