#173B7A#173B7A

#173B7A is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.5% C 0.115 H 260.7°. Best body text is #FFFFFF at 10.81:1 contrast (WCAG AA passes).

Color values

HEX	#173B7A
RGB	rgb(23, 59, 122)
HSL	hsl(218, 68%, 28%)
HSV	hsv(218, 81%, 48%)
CMYK	cmyk(81.1%, 51.6%, 0%, 52.2%)
CIE-LAB	lab(25.91, 11.93, -39.57)
CIE-LCH	lch(25.91, 41.33, 286.78°)
OKLab	oklab(36.52% -0.0186 -0.1138)
OKLCH	oklch(36.52% 0.115 260.7)
XYZ	xyz(5.4289, 4.7146, 19.0325)
Luminance	0.0471 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B7A #7A5617

analogous

#176C7A #173B7A #24177A

triadic

#173B7A #7A173B #3B7A17

tetradic

#173B7A #7A176C #7A5617 #177A24

square

#173B7A #7A176C #7A5617 #177A24

split-complementary

#173B7A #7A2417 #6C7A17

monochromatic

#050C1A #0D2247 #173B7A #2154AD #336FD9

Accessibility & contrast

On white

10.81

#173B7A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#173B7A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B7A

10.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B7A	#FFFFFF	#000000	##FFFFFF
##173B7A	1.00	10.81	1.94	10.81
#FFFFFF	10.81	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#15427C

Deuteranopia (green-blind)

#003979

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173b7a;
/* rgb */ color: rgb(23, 59, 122);
/* oklch */ color: oklch(36.5% 0.115 260.7);

Tailwind

colors: {
  custom: {
    50: '#6570a1',
    500: '#173b7a',
    950: '#000000',
  },
}

SCSS

$custom: #173b7a;
$custom-light: #6570a1;
$custom-dark: #000000;

JSON

{
  "hex": "#173b7a",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 122
  },
  "hsl": {
    "h": 218.182,
    "s": 68.276,
    "l": 28.431
  },
  "oklch": {
    "l": 0.36518,
    "c": 0.11535,
    "h": 260.7
  },
  "luminance": 0.04715
}

Semantic roles & 50–950 ramp

primary

#173B7A

secondary

#AF863E

accent

#AC3DEB

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070F

muted

#7A7A7E

Preview Lab

Preview with #173B7A

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

Preview Lab → · Contrast checker → · Palette generator →