#A63B33#A63B33

#A63B33 is a mid, vivid red. Relative luminance 0.115; OKLCH L 50.3% C 0.143 H 27.6°. Best body text is #FFFFFF at 6.37:1 contrast (WCAG AA passes).

Color values

HEX	#A63B33
RGB	rgb(166, 59, 51)
HSL	hsl(4, 53%, 43%)
HSV	hsv(4, 69%, 65%)
CMYK	cmyk(0%, 64.5%, 69.3%, 34.9%)
CIE-LAB	lab(40.37, 43.56, 28.54)
CIE-LCH	lch(40.37, 52.08, 33.23°)
OKLab	oklab(50.27% 0.1265 0.0662)
OKLCH	oklch(50.27% 0.143 27.6)
XYZ	xyz(17.8892, 11.4764, 4.4045)
Luminance	0.1147 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#A63B33 #339EA6

analogous

#A63364 #A63B33 #A67533

triadic

#A63B33 #33A63B #3B33A6

tetradic

#A63B33 #64A633 #339EA6 #7533A6

square

#A63B33 #64A633 #339EA6 #7533A6

split-complementary

#A63B33 #33A675 #3364A6

monochromatic

#481A16 #772A25 #A63B33 #C9564E #D7837C

Accessibility & contrast

On white

6.37

#A63B33 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.29

#A63B33 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #A63B33

6.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##A63B33	#FFFFFF	#000000	##FFFFFF
##A63B33	1.00	6.37	3.29	6.37
#FFFFFF	6.37	1.00	21.00	1.00
#000000	3.29	21.00	1.00	21.00
##FFFFFF	6.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#585131

Deuteranopia (green-blind)

#736830

Tritanopia (blue-blind)

#B6223A

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #a63b33;
/* rgb */ color: rgb(166, 59, 51);
/* oklch */ color: oklch(50.3% 0.143 27.6);

Tailwind

colors: {
  custom: {
    50: '#c7766b',
    500: '#a63b33',
    950: '#000000',
  },
}

SCSS

$custom: #a63b33;
$custom-light: #c7766b;
$custom-dark: #000000;

JSON

{
  "hex": "#a63b33",
  "rgb": {
    "r": 166,
    "g": 59,
    "b": 51
  },
  "hsl": {
    "h": 4.174,
    "s": 52.995,
    "l": 42.549
  },
  "oklch": {
    "l": 0.50265,
    "c": 0.14278,
    "h": 27.6
  },
  "luminance": 0.11474
}

Semantic roles & 50–950 ramp

primary

#A63B33

secondary

#75BBC0

accent

#D2DC4B

background

#FDF7F6

surface

#FAEDEB

border

#D3C8C6

text

#140906

muted

#837B7A

Preview Lab

Preview with #A63B33

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

Preview Lab → · Contrast checker → · Palette generator →