#173B7B#173B7B

#173B7B is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.6% C 0.117 H 260.9°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#173B7B
RGB	rgb(23, 59, 123)
HSL	hsl(218, 68%, 29%)
HSV	hsv(218, 81%, 48%)
CMYK	cmyk(81.3%, 52%, 0%, 51.8%)
CIE-LAB	lab(25.98, 12.35, -40.09)
CIE-LCH	lch(25.98, 41.94, 287.12°)
OKLab	oklab(36.6% -0.0185 -0.1153)
OKLCH	oklch(36.6% 0.117 260.9)
XYZ	xyz(5.4912, 4.7395, 19.3605)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173B7B #7B5717

analogous

#176D7B #173B7B #25177B

triadic

#173B7B #7B173B #3B7B17

tetradic

#173B7B #7B176D #7B5717 #177B25

square

#173B7B #7B176D #7B5717 #177B25

split-complementary

#173B7B #7B2517 #6D7B17

monochromatic

#050C1A #0D2247 #173B7B #2154AF #336FD9

Accessibility & contrast

On white

10.78

#173B7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#173B7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173B7B

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173B7B	#FFFFFF	#000000	##FFFFFF
##173B7B	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#14427D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#004A55

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173b7b;
/* rgb */ color: rgb(23, 59, 123);
/* oklch */ color: oklch(36.6% 0.117 260.9);

Tailwind

colors: {
  custom: {
    50: '#6570a2',
    500: '#173b7b',
    950: '#000000',
  },
}

SCSS

$custom: #173b7b;
$custom-light: #6570a2;
$custom-dark: #000000;

JSON

{
  "hex": "#173b7b",
  "rgb": {
    "r": 23,
    "g": 59,
    "b": 123
  },
  "hsl": {
    "h": 218.4,
    "s": 68.493,
    "l": 28.627
  },
  "oklch": {
    "l": 0.36598,
    "c": 0.11681,
    "h": 260.9
  },
  "luminance": 0.0474
}

Semantic roles & 50–950 ramp

primary

#173B7B

secondary

#B0873E

accent

#AC3CEB

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#06070F

muted

#7A7A7F

Preview Lab

Preview with #173B7B

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

Preview Lab → · Contrast checker → · Palette generator →