#A63F37#A63F37

#A63F37 is a mid, vivid red. Relative luminance 0.119; OKLCH L 50.8% C 0.138 H 27.4°. Best body text is #FFFFFF at 6.20:1 contrast (WCAG AA passes).

Color values

HEX	#A63F37
RGB	rgb(166, 63, 55)
HSL	hsl(4, 50%, 43%)
HSV	hsv(4, 67%, 65%)
CMYK	cmyk(0%, 62%, 66.9%, 34.9%)
CIE-LAB	lab(41.12, 41.95, 27.05)
CIE-LCH	lch(41.12, 49.92, 32.82°)
OKLab	oklab(50.85% 0.1223 0.0635)
OKLCH	oklch(50.85% 0.138 27.4)
XYZ	xyz(18.1948, 11.9403, 4.9603)
Luminance	0.1194 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#A63F37 #379EA6

analogous

#A63766 #A63F37 #A67637

triadic

#A63F37 #37A63F #3F37A6

tetradic

#A63F37 #66A637 #379EA6 #7637A6

square

#A63F37 #66A637 #379EA6 #7637A6

split-complementary

#A63F37 #37A676 #3766A6

monochromatic

#4A1C19 #782E28 #A63F37 #C65C54 #D68882

Accessibility & contrast

On white

6.20

#A63F37 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.39

#A63F37 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #A63F37

6.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##A63F37	#FFFFFF	#000000	##FFFFFF
##A63F37	1.00	6.20	3.39	6.20
#FFFFFF	6.20	1.00	21.00	1.00
#000000	3.39	21.00	1.00	21.00
##FFFFFF	6.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A5336

Deuteranopia (green-blind)

#746934

Tritanopia (blue-blind)

#B6293E

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #a63f37;
/* rgb */ color: rgb(166, 63, 55);
/* oklch */ color: oklch(50.8% 0.138 27.4);

Tailwind

colors: {
  custom: {
    50: '#c7796e',
    500: '#a63f37',
    950: '#000000',
  },
}

SCSS

$custom: #a63f37;
$custom-light: #c7796e;
$custom-dark: #000000;

JSON

{
  "hex": "#a63f37",
  "rgb": {
    "r": 166,
    "g": 63,
    "b": 55
  },
  "hsl": {
    "h": 4.324,
    "s": 50.226,
    "l": 43.333
  },
  "oklch": {
    "l": 0.50848,
    "c": 0.13778,
    "h": 27.4
  },
  "luminance": 0.11938
}

Semantic roles & 50–950 ramp

primary

#A63F37

secondary

#7ABABF

accent

#D0DA4E

background

#FDF7F6

surface

#FAEEEB

border

#D3C9C6

text

#140907

muted

#837B7A

Preview Lab

Preview with #A63F37

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

Preview Lab → · Contrast checker → · Palette generator →