#173B74#173B74

#173B74 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.0% C 0.107 H 259.4°. Best body text is #FFFFFF at 10.97:1 contrast (WCAG AA passes).

Color values

HEX	#173B74
RGB	rgb(23, 59, 116)
HSL	hsl(217, 67%, 27%)
HSV	hsv(217, 80%, 45%)
CMYK	cmyk(80.2%, 49.1%, 0%, 54.5%)
CIE-LAB	lab(25.47, 9.43, -36.47)
CIE-LCH	lch(25.47, 37.67, 284.50°)
OKLab	oklab(36.05% -0.0196 -0.1047)
OKLCH	oklch(36.05% 0.107 259.4)
XYZ	xyz(5.0686, 4.5705, 17.1347)
Luminance	0.0457 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B74 #745017

analogous

#176A74 #173B74 #221774

triadic

#173B74 #74173B #3B7417

tetradic

#173B74 #74176A #745017 #177422

square

#173B74 #74176A #745017 #177422

split-complementary

#173B74 #742217 #6A7417

monochromatic

#050D1A #0D2141 #173B74 #2155A7 #3070D6

Accessibility & contrast

On white

10.97

#173B74 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#173B74 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B74

10.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B74	#FFFFFF	#000000	##FFFFFF
##173B74	1.00	10.97	1.91	10.97
#FFFFFF	10.97	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	10.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C4176

Deuteranopia (green-blind)

#033873

Tritanopia (blue-blind)

#004952

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #173b74;
/* rgb */ color: rgb(23, 59, 116);
/* oklch */ color: oklch(36.0% 0.107 259.4);

Tailwind

colors: {
  custom: {
    50: '#63709c',
    500: '#173b74',
    950: '#000000',
  },
}

SCSS

$custom: #173b74;
$custom-light: #63709c;
$custom-dark: #000000;

JSON

{
  "hex": "#173b74",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 116
  },
  "hsl": {
    "h": 216.774,
    "s": 66.906,
    "l": 27.255
  },
  "oklch": {
    "l": 0.36049,
    "c": 0.10652,
    "h": 259.4
  },
  "luminance": 0.04571
}

Semantic roles & 50–950 ramp

primary

#173B74

secondary

#A9803D

accent

#A73EEA

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #173B74

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

Preview Lab → · Contrast checker → · Palette generator →