#172C81#172C81

#172C81 is a dark, vivid blue. Relative luminance 0.036; OKLCH L 33.9% C 0.145 H 267.1°. Best body text is #FFFFFF at 12.25:1 contrast (WCAG AA passes).

Color values

HEX	#172C81
RGB	rgb(23, 44, 129)
HSL	hsl(228, 70%, 30%)
HSV	hsv(228, 82%, 51%)
CMYK	cmyk(82.2%, 65.9%, 0%, 49.4%)
CIE-LAB	lab(22.19, 25.39, -50.04)
CIE-LCH	lch(22.19, 56.11, 296.91°)
OKLab	oklab(33.91% -0.0074 -0.1448)
OKLCH	oklch(33.91% 0.145 267.1)
XYZ	xyz(5.2151, 3.5679, 21.1784)
Luminance	0.0357 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172C81 #816C17

analogous

#176181 #172C81 #371781

triadic

#172C81 #81172C #2C8117

tetradic

#172C81 #811761 #816C17 #178137

square

#172C81 #811761 #816C17 #178137

split-complementary

#172C81 #813717 #618117

monochromatic

#05091A #0E1A4D #172C81 #203EB5 #3758DB

Accessibility & contrast

On white

12.25

#172C81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.71

#172C81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172C81

12.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172C81	#FFFFFF	#000000	##FFFFFF
##172C81	1.00	12.25	1.71	12.25
#FFFFFF	12.25	1.00	21.00	1.00
#000000	1.71	21.00	1.00	21.00
##FFFFFF	12.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A84

Deuteranopia (green-blind)

#00307F

Tritanopia (blue-blind)

#004252

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #172c81;
/* rgb */ color: rgb(23, 44, 129);
/* oklch */ color: oklch(33.9% 0.145 267.1);

Tailwind

colors: {
  custom: {
    50: '#6865a6',
    500: '#172c81',
    950: '#000000',
  },
}

SCSS

$custom: #172c81;
$custom-light: #6865a6;
$custom-dark: #000000;

JSON

{
  "hex": "#172c81",
  "rgb": {
    "r": 23,
    "g": 44,
    "b": 129
  },
  "hsl": {
    "h": 228.113,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.33905,
    "c": 0.14501,
    "h": 267.1
  },
  "luminance": 0.03569
}

Semantic roles & 50–950 ramp

primary

#172C81

secondary

#B59E3E

accent

#C93BED

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07050F

muted

#7A7A7F

Preview Lab

Preview with #172C81

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

Preview Lab → · Contrast checker → · Palette generator →