#173B78#173B78

#173B78 is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.4% C 0.112 H 260.3°. Best body text is #FFFFFF at 10.86:1 contrast (WCAG AA passes).

Color values

HEX	#173B78
RGB	rgb(23, 59, 120)
HSL	hsl(218, 68%, 28%)
HSV	hsv(218, 81%, 47%)
CMYK	cmyk(80.8%, 50.8%, 0%, 52.9%)
CIE-LAB	lab(25.76, 11.10, -38.55)
CIE-LCH	lch(25.76, 40.11, 286.06°)
OKLab	oklab(36.36% -0.019 -0.1108)
OKLCH	oklch(36.36% 0.112 260.3)
XYZ	xyz(5.3062, 4.6655, 18.3865)
Luminance	0.0467 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B78 #785417

analogous

#176B78 #173B78 #231778

triadic

#173B78 #78173B #3B7817

tetradic

#173B78 #78176B #785417 #177823

square

#173B78 #78176B #785417 #177823

split-complementary

#173B78 #782317 #6B7817

monochromatic

#050D1A #0D2245 #173B78 #2154AB #326FD8

Accessibility & contrast

On white

10.86

#173B78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#173B78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B78

10.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B78	#FFFFFF	#000000	##FFFFFF
##173B78	1.00	10.86	1.93	10.86
#FFFFFF	10.86	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#18427A

Deuteranopia (green-blind)

#003977

Tritanopia (blue-blind)

#004A53

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173b78;
/* rgb */ color: rgb(23, 59, 120);
/* oklch */ color: oklch(36.4% 0.112 260.3);

Tailwind

colors: {
  custom: {
    50: '#64709f',
    500: '#173b78',
    950: '#000000',
  },
}

SCSS

$custom: #173b78;
$custom-light: #64709f;
$custom-dark: #000000;

JSON

{
  "hex": "#173b78",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 120
  },
  "hsl": {
    "h": 217.732,
    "s": 67.832,
    "l": 28.039
  },
  "oklch": {
    "l": 0.36359,
    "c": 0.11241,
    "h": 260.3
  },
  "luminance": 0.04666
}

Semantic roles & 50–950 ramp

primary

#173B78

secondary

#AD843E

accent

#AA3DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173B78

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

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