#663A40#663A40

#663A40 is a dark, moderate red. Relative luminance 0.062; OKLCH L 40.4% C 0.063 H 11.5°. Best body text is #FFFFFF at 9.36:1 contrast (WCAG AA passes).

Color values

HEX	#663A40
RGB	rgb(102, 58, 64)
HSL	hsl(352, 28%, 31%)
HSV	hsv(352, 43%, 40%)
CMYK	cmyk(0%, 43.1%, 37.3%, 60%)
CIE-LAB	lab(29.96, 20.25, 4.73)
CIE-LCH	lch(29.96, 20.79, 13.14°)
OKLab	oklab(40.41% 0.0614 0.0124)
OKLCH	oklch(40.41% 0.063 11.5)
XYZ	xyz(7.9183, 6.2217, 5.6334)
Luminance	0.0622 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#663A40 #3A6660

analogous

#663A56 #663A40 #664A3A

triadic

#663A40 #40663A #3A4066

tetradic

#663A40 #56663A #3A6660 #4A3A66

square

#663A40 #56663A #3A6660 #4A3A66

split-complementary

#663A40 #3A664A #3A5666

monochromatic

#180E0F #3F2428 #663A40 #8D5058 #AC6E76

Accessibility & contrast

On white

9.36

#663A40 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#663A40 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #663A40

9.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##663A40	#FFFFFF	#000000	##FFFFFF
##663A40	1.00	9.36	2.24	9.36
#FFFFFF	9.36	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#424140

Deuteranopia (green-blind)

#4D4A3F

Tritanopia (blue-blind)

#6D363C

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #663a40;
/* rgb */ color: rgb(102, 58, 64);
/* oklch */ color: oklch(40.4% 0.063 11.5);

Tailwind

colors: {
  custom: {
    50: '#937174',
    500: '#663a40',
    950: '#000000',
  },
}

SCSS

$custom: #663a40;
$custom-light: #937174;
$custom-dark: #000000;

JSON

{
  "hex": "#663a40",
  "rgb": {
    "r": 102,
    "g": 58,
    "b": 64
  },
  "hsl": {
    "h": 351.818,
    "s": 27.5,
    "l": 31.373
  },
  "oklch": {
    "l": 0.40405,
    "c": 0.06265,
    "h": 11.5
  },
  "luminance": 0.06221
}

Semantic roles & 50–950 ramp

primary

#663A40

secondary

#669690

accent

#C4B764

background

#F9F6F7

surface

#F1ECED

border

#CBC7C8

text

#0D0708

muted

#7E7A7B

Preview Lab

Preview with #663A40

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →