#173D7F#173D7F

#173D7F is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.4% C 0.120 H 260.6°. Best body text is #FFFFFF at 10.45:1 contrast (WCAG AA passes).

Color values

HEX	#173D7F
RGB	rgb(23, 61, 127)
HSL	hsl(218, 69%, 29%)
HSV	hsv(218, 82%, 50%)
CMYK	cmyk(81.9%, 52%, 0%, 50.2%)
CIE-LAB	lab(26.88, 12.60, -41.15)
CIE-LCH	lch(26.88, 43.03, 287.03°)
OKLab	oklab(37.38% -0.0196 -0.1184)
OKLCH	oklch(37.38% 0.12 260.6)
XYZ	xyz(5.8515, 5.0513, 20.7412)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173D7F #7F5917

analogous

#17717F #173D7F #25177F

triadic

#173D7F #7F173D #3D7F17

tetradic

#173D7F #7F1771 #7F5917 #177F25

square

#173D7F #7F1771 #7F5917 #177F25

split-complementary

#173D7F #7F2517 #717F17

monochromatic

#050C1A #0E244B #173D7F #2056B3 #3672DB

Accessibility & contrast

On white

10.45

#173D7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#173D7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173D7F

10.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173D7F	#FFFFFF	#000000	##FFFFFF
##173D7F	1.00	10.45	2.01	10.45
#FFFFFF	10.45	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#144581

Deuteranopia (green-blind)

#003B7E

Tritanopia (blue-blind)

#004D58

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173d7f;
/* rgb */ color: rgb(23, 61, 127);
/* oklch */ color: oklch(37.4% 0.120 260.6);

Tailwind

colors: {
  custom: {
    50: '#6671a5',
    500: '#173d7f',
    950: '#000000',
  },
}

SCSS

$custom: #173d7f;
$custom-light: #6671a5;
$custom-dark: #000000;

JSON

{
  "hex": "#173d7f",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 127
  },
  "hsl": {
    "h": 218.077,
    "s": 69.333,
    "l": 29.412
  },
  "oklch": {
    "l": 0.37381,
    "c": 0.12001,
    "h": 260.6
  },
  "luminance": 0.05052
}

Semantic roles & 50–950 ramp

primary

#173D7F

secondary

#B4893E

accent

#AC3CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173D7F

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

Preview Lab → · Contrast checker → · Palette generator →