#A3303B#A3303B

#A3303B is a mid, vivid red. Relative luminance 0.102; OKLCH L 48.6% C 0.150 H 19.5°. Best body text is #FFFFFF at 6.90:1 contrast (WCAG AA passes).

Color values

HEX	#A3303B
RGB	rgb(163, 48, 59)
HSL	hsl(354, 55%, 41%)
HSV	hsv(354, 71%, 64%)
CMYK	cmyk(0%, 70.6%, 63.8%, 36.1%)
CIE-LAB	lab(38.23, 47.69, 20.86)
CIE-LCH	lch(38.23, 52.05, 23.63°)
OKLab	oklab(48.6% 0.1416 0.0501)
OKLCH	oklch(48.6% 0.15 19.5)
XYZ	xyz(16.9523, 10.2186, 5.2166)
Luminance	0.1022 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#A3303B #30A398

analogous

#A33075 #A3303B #A35F30

triadic

#A3303B #3BA330 #303BA3

tetradic

#A3303B #75A330 #30A398 #5F30A3

square

#A3303B #75A330 #30A398 #5F30A3

split-complementary

#A3303B #30A35F #3075A3

monochromatic

#441419 #74222A #A3303B #C94754 #D77780

Accessibility & contrast

On white

6.90

#A3303B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.04

#A3303B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #A3303B

6.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##A3303B	#FFFFFF	#000000	##FFFFFF
##A3303B	1.00	6.90	3.04	6.90
#FFFFFF	6.90	1.00	21.00	1.00
#000000	3.04	21.00	1.00	21.00
##FFFFFF	6.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F4B3B

Deuteranopia (green-blind)

#6C6338

Tritanopia (blue-blind)

#B31035

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #a3303b;
/* rgb */ color: rgb(163, 48, 59);
/* oklch */ color: oklch(48.6% 0.150 19.5);

Tailwind

colors: {
  custom: {
    50: '#c57070',
    500: '#a3303b',
    950: '#000000',
  },
}

SCSS

$custom: #a3303b;
$custom-light: #c57070;
$custom-dark: #000000;

JSON

{
  "hex": "#a3303b",
  "rgb": {
    "r": 163,
    "g": 48,
    "b": 59
  },
  "hsl": {
    "h": 354.261,
    "s": 54.502,
    "l": 41.373
  },
  "oklch": {
    "l": 0.48603,
    "c": 0.1502,
    "h": 19.5
  },
  "luminance": 0.10216
}

Semantic roles & 50–950 ramp

primary

#A3303B

secondary

#70BFB7

accent

#DED04A

background

#FCF7F6

surface

#F9EDEC

border

#D2C8C7

text

#140807

muted

#827B7A

Preview Lab

Preview with #A3303B

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

Preview Lab → · Contrast checker → · Palette generator →