#173B81#173B81

#173B81 is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.1% C 0.126 H 261.9°. Best body text is #FFFFFF at 10.61:1 contrast (WCAG AA passes).

Color values

HEX	#173B81
RGB	rgb(23, 59, 129)
HSL	hsl(220, 70%, 30%)
HSV	hsv(220, 82%, 51%)
CMYK	cmyk(82.2%, 54.3%, 0%, 49.4%)
CIE-LAB	lab(26.43, 14.84, -43.12)
CIE-LCH	lch(26.43, 45.60, 288.98°)
OKLab	oklab(37.09% -0.0177 -0.1243)
OKLCH	oklch(37.09% 0.126 261.9)
XYZ	xyz(5.8783, 4.8944, 21.3995)
Luminance	0.0490 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B81 #815D17

analogous

#177081 #173B81 #281781

triadic

#173B81 #81173B #3B8117

tetradic

#173B81 #811770 #815D17 #178128

square

#173B81 #811770 #815D17 #178128

split-complementary

#173B81 #812817 #708117

monochromatic

#050C1A #0E234D #173B81 #2053B5 #376FDB

Accessibility & contrast

On white

10.61

#173B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#173B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B81

10.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B81	#FFFFFF	#000000	##FFFFFF
##173B81	1.00	10.61	1.98	10.61
#FFFFFF	10.61	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#084483

Deuteranopia (green-blind)

#003A80

Tritanopia (blue-blind)

#004C58

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #173b81;
/* rgb */ color: rgb(23, 59, 129);
/* oklch */ color: oklch(37.1% 0.126 261.9);

Tailwind

colors: {
  custom: {
    50: '#6770a6',
    500: '#173b81',
    950: '#000000',
  },
}

SCSS

$custom: #173b81;
$custom-light: #6770a6;
$custom-dark: #000000;

JSON

{
  "hex": "#173b81",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 129
  },
  "hsl": {
    "h": 219.623,
    "s": 69.737,
    "l": 29.804
  },
  "oklch": {
    "l": 0.37086,
    "c": 0.12553,
    "h": 261.9
  },
  "luminance": 0.04895
}

Semantic roles & 50–950 ramp

primary

#173B81

secondary

#B58D3E

accent

#B03BED

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173B81

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

Preview Lab → · Contrast checker → · Palette generator →