#173F7D#173F7D

#173F7D is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.7% C 0.115 H 259.2°. Best body text is #FFFFFF at 10.28:1 contrast (WCAG AA passes).

Color values

HEX	#173F7D
RGB	rgb(23, 63, 125)
HSL	hsl(216, 69%, 29%)
HSV	hsv(216, 82%, 49%)
CMYK	cmyk(81.6%, 49.6%, 0%, 51%)
CIE-LAB	lab(27.34, 10.37, -39.14)
CIE-LCH	lch(27.34, 40.49, 284.84°)
OKLab	oklab(37.69% -0.0215 -0.1125)
OKLCH	oklch(37.69% 0.115 259.2)
XYZ	xyz(5.8312, 5.2172, 20.0977)
Luminance	0.0522 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7D #7D5517

analogous

#17727D #173F7D #22177D

triadic

#173F7D #7D173F #3F7D17

tetradic

#173F7D #7D1772 #7D5517 #177D22

square

#173F7D #7D1772 #7D5517 #177D22

split-complementary

#173F7D #7D2217 #727D17

monochromatic

#050D1A #0D2549 #173F7D #2159B1 #3575DA

Accessibility & contrast

On white

10.28

#173F7D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#173F7D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7D

10.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7D	#FFFFFF	#000000	##FFFFFF
##173F7D	1.00	10.28	2.04	10.28
#FFFFFF	10.28	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C467F

Deuteranopia (green-blind)

#003C7C

Tritanopia (blue-blind)

#004E58

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173f7d;
/* rgb */ color: rgb(23, 63, 125);
/* oklch */ color: oklch(37.7% 0.115 259.2);

Tailwind

colors: {
  custom: {
    50: '#6673a3',
    500: '#173f7d',
    950: '#000000',
  },
}

SCSS

$custom: #173f7d;
$custom-light: #6673a3;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7d",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 125
  },
  "hsl": {
    "h": 216.471,
    "s": 68.919,
    "l": 29.02
  },
  "oklch": {
    "l": 0.37691,
    "c": 0.11452,
    "h": 259.2
  },
  "luminance": 0.05218
}

Semantic roles & 50–950 ramp

primary

#173F7D

secondary

#B2843E

accent

#A73CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F7D

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

Preview Lab → · Contrast checker → · Palette generator →