#173B7F#173B7F

#173B7F is a dark, vivid blue. Relative luminance 0.048; OKLCH L 36.9% C 0.123 H 261.6°. Best body text is #FFFFFF at 10.67:1 contrast (WCAG AA passes).

Color values

HEX	#173B7F
RGB	rgb(23, 59, 127)
HSL	hsl(219, 69%, 29%)
HSV	hsv(219, 82%, 50%)
CMYK	cmyk(81.9%, 53.5%, 0%, 50.2%)
CIE-LAB	lab(26.28, 14.01, -42.12)
CIE-LCH	lch(26.28, 44.39, 288.40°)
OKLab	oklab(36.92% -0.0179 -0.1213)
OKLCH	oklch(36.92% 0.123 261.6)
XYZ	xyz(5.7467, 4.8417, 20.7062)
Luminance	0.0484 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B7F #7F5B17

analogous

#176F7F #173B7F #27177F

triadic

#173B7F #7F173B #3B7F17

tetradic

#173B7F #7F176F #7F5B17 #177F27

square

#173B7F #7F176F #7F5B17 #177F27

split-complementary

#173B7F #7F2717 #6F7F17

monochromatic

#050C1A #0E234B #173B7F #2053B3 #366FDB

Accessibility & contrast

On white

10.67

#173B7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#173B7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B7F

10.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B7F	#FFFFFF	#000000	##FFFFFF
##173B7F	1.00	10.67	1.97	10.67
#FFFFFF	10.67	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D4381

Deuteranopia (green-blind)

#003A7E

Tritanopia (blue-blind)

#004C57

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #173b7f;
/* rgb */ color: rgb(23, 59, 127);
/* oklch */ color: oklch(36.9% 0.123 261.6);

Tailwind

colors: {
  custom: {
    50: '#6670a5',
    500: '#173b7f',
    950: '#000000',
  },
}

SCSS

$custom: #173b7f;
$custom-light: #6670a5;
$custom-dark: #000000;

JSON

{
  "hex": "#173b7f",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 127
  },
  "hsl": {
    "h": 219.231,
    "s": 69.333,
    "l": 29.412
  },
  "oklch": {
    "l": 0.36922,
    "c": 0.12263,
    "h": 261.6
  },
  "luminance": 0.04842
}

Semantic roles & 50–950 ramp

primary

#173B7F

secondary

#B48B3E

accent

#AF3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173B7F

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

Preview Lab → · Contrast checker → · Palette generator →