#173F7E#173F7E

#173F7E is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.8% C 0.116 H 259.4°. Best body text is #FFFFFF at 10.25:1 contrast (WCAG AA passes).

Color values

HEX	#173F7E
RGB	rgb(23, 63, 126)
HSL	hsl(217, 69%, 29%)
HSV	hsv(217, 82%, 49%)
CMYK	cmyk(81.7%, 50%, 0%, 50.6%)
CIE-LAB	lab(27.42, 10.79, -39.65)
CIE-LCH	lch(27.42, 41.10, 285.22°)
OKLab	oklab(37.77% -0.0214 -0.114)
OKLCH	oklch(37.77% 0.116 259.4)
XYZ	xyz(5.8954, 5.2428, 20.4359)
Luminance	0.0524 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7E #7E5617

analogous

#17737E #173F7E #23177E

triadic

#173F7E #7E173F #3F7E17

tetradic

#173F7E #7E1773 #7E5617 #177E23

square

#173F7E #7E1773 #7E5617 #177E23

split-complementary

#173F7E #7E2317 #737E17

monochromatic

#050D1A #0E254A #173F7E #2059B2 #3575DA

Accessibility & contrast

On white

10.25

#173F7E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#173F7E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7E

10.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7E	#FFFFFF	#000000	##FFFFFF
##173F7E	1.00	10.25	2.05	10.25
#FFFFFF	10.25	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B4680

Deuteranopia (green-blind)

#003C7D

Tritanopia (blue-blind)

#004E58

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173f7e;
/* rgb */ color: rgb(23, 63, 126);
/* oklch */ color: oklch(37.8% 0.116 259.4);

Tailwind

colors: {
  custom: {
    50: '#6673a4',
    500: '#173f7e',
    950: '#000000',
  },
}

SCSS

$custom: #173f7e;
$custom-light: #6673a4;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7e",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 126
  },
  "hsl": {
    "h": 216.699,
    "s": 69.128,
    "l": 29.216
  },
  "oklch": {
    "l": 0.37768,
    "c": 0.11597,
    "h": 259.4
  },
  "luminance": 0.05244
}

Semantic roles & 50–950 ramp

primary

#173F7E

secondary

#B3853E

accent

#A83CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F7E

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

Preview Lab → · Contrast checker → · Palette generator →