#173B7E#173B7E

#173B7E is a dark, vivid blue. Relative luminance 0.048; OKLCH L 36.8% C 0.121 H 261.4°. Best body text is #FFFFFF at 10.70:1 contrast (WCAG AA passes).

Color values

HEX	#173B7E
RGB	rgb(23, 59, 126)
HSL	hsl(219, 69%, 29%)
HSV	hsv(219, 82%, 49%)
CMYK	cmyk(81.7%, 53.2%, 0%, 50.6%)
CIE-LAB	lab(26.20, 13.59, -41.61)
CIE-LCH	lch(26.20, 43.78, 288.09°)
OKLab	oklab(36.84% -0.0181 -0.1198)
OKLCH	oklch(36.84% 0.121 261.4)
XYZ	xyz(5.6818, 4.8158, 20.3647)
Luminance	0.0482 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B7E #7E5A17

analogous

#176F7E #173B7E #26177E

triadic

#173B7E #7E173B #3B7E17

tetradic

#173B7E #7E176F #7E5A17 #177E26

square

#173B7E #7E176F #7E5A17 #177E26

split-complementary

#173B7E #7E2617 #6F7E17

monochromatic

#050C1A #0E234A #173B7E #2053B2 #356FDA

Accessibility & contrast

On white

10.70

#173B7E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#173B7E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B7E

10.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B7E	#FFFFFF	#000000	##FFFFFF
##173B7E	1.00	10.70	1.96	10.70
#FFFFFF	10.70	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F4380

Deuteranopia (green-blind)

#003A7D

Tritanopia (blue-blind)

#004B56

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173b7e;
/* rgb */ color: rgb(23, 59, 126);
/* oklch */ color: oklch(36.8% 0.121 261.4);

Tailwind

colors: {
  custom: {
    50: '#6670a4',
    500: '#173b7e',
    950: '#000000',
  },
}

SCSS

$custom: #173b7e;
$custom-light: #6670a4;
$custom-dark: #000000;

JSON

{
  "hex": "#173b7e",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 126
  },
  "hsl": {
    "h": 219.029,
    "s": 69.128,
    "l": 29.216
  },
  "oklch": {
    "l": 0.3684,
    "c": 0.12119,
    "h": 261.4
  },
  "luminance": 0.04816
}

Semantic roles & 50–950 ramp

primary

#173B7E

secondary

#B38A3E

accent

#AE3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173B7E

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

Preview Lab → · Contrast checker → · Palette generator →