#172D81#172D81

#172D81 is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.1% C 0.144 H 266.8°. Best body text is #FFFFFF at 12.15:1 contrast (WCAG AA passes).

Color values

HEX	#172D81
RGB	rgb(23, 45, 129)
HSL	hsl(228, 70%, 30%)
HSV	hsv(228, 82%, 51%)
CMYK	cmyk(82.2%, 65.1%, 0%, 49.4%)
CIE-LAB	lab(22.46, 24.70, -49.60)
CIE-LCH	lch(22.46, 55.41, 296.47°)
OKLab	oklab(34.1% -0.008 -0.1435)
OKLCH	oklch(34.1% 0.144 266.8)
XYZ	xyz(5.2528, 3.6433, 21.1910)
Luminance	0.0364 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172D81 #816B17

analogous

#176281 #172D81 #361781

triadic

#172D81 #81172D #2D8117

tetradic

#172D81 #811762 #816B17 #178136

square

#172D81 #811762 #816B17 #178136

split-complementary

#172D81 #813617 #628117

monochromatic

#05091A #0E1B4D #172D81 #203FB5 #3759DB

Accessibility & contrast

On white

12.15

#172D81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#172D81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172D81

12.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172D81	#FFFFFF	#000000	##FFFFFF
##172D81	1.00	12.15	1.73	12.15
#FFFFFF	12.15	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B84

Deuteranopia (green-blind)

#00317F

Tritanopia (blue-blind)

#004352

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #172d81;
/* rgb */ color: rgb(23, 45, 129);
/* oklch */ color: oklch(34.1% 0.144 266.8);

Tailwind

colors: {
  custom: {
    50: '#6865a6',
    500: '#172d81',
    950: '#000000',
  },
}

SCSS

$custom: #172d81;
$custom-light: #6865a6;
$custom-dark: #000000;

JSON

{
  "hex": "#172d81",
  "rgb": {
    "r": 23,
    "g": 45,
    "b": 129
  },
  "hsl": {
    "h": 227.547,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.34102,
    "c": 0.14375,
    "h": 266.8
  },
  "luminance": 0.03644
}

Semantic roles & 50–950 ramp

primary

#172D81

secondary

#B59D3E

accent

#C83BED

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07050F

muted

#7A7A7F

Preview Lab

Preview with #172D81

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

Preview Lab → · Contrast checker → · Palette generator →