#173F7B#173F7B

#173F7B is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.5% C 0.112 H 258.7°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#173F7B
RGB	rgb(23, 63, 123)
HSL	hsl(216, 68%, 29%)
HSV	hsv(216, 81%, 48%)
CMYK	cmyk(81.3%, 48.8%, 0%, 51.8%)
CIE-LAB	lab(27.20, 9.54, -38.11)
CIE-LCH	lch(27.20, 39.29, 284.05°)
OKLab	oklab(37.54% -0.0219 -0.1094)
OKLCH	oklch(37.54% 0.112 258.7)
XYZ	xyz(5.7047, 5.1666, 19.4316)
Luminance	0.0517 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7B #7B5317

analogous

#17717B #173F7B #21177B

triadic

#173F7B #7B173F #3F7B17

tetradic

#173F7B #7B1771 #7B5317 #177B21

square

#173F7B #7B1771 #7B5317 #177B21

split-complementary

#173F7B #7B2117 #717B17

monochromatic

#050D1A #0D2547 #173F7B #2159AF #3376D9

Accessibility & contrast

On white

10.33

#173F7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#173F7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7B

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7B	#FFFFFF	#000000	##FFFFFF
##173F7B	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E457D

Deuteranopia (green-blind)

#033C7A

Tritanopia (blue-blind)

#004D57

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #173f7b;
/* rgb */ color: rgb(23, 63, 123);
/* oklch */ color: oklch(37.5% 0.112 258.7);

Tailwind

colors: {
  custom: {
    50: '#6573a2',
    500: '#173f7b',
    950: '#000000',
  },
}

SCSS

$custom: #173f7b;
$custom-light: #6573a2;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7b",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 123
  },
  "hsl": {
    "h": 216,
    "s": 68.493,
    "l": 28.627
  },
  "oklch": {
    "l": 0.37538,
    "c": 0.11161,
    "h": 258.7
  },
  "luminance": 0.05167
}

Semantic roles & 50–950 ramp

primary

#173F7B

secondary

#B0823E

accent

#A53CEB

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#06080F

muted

#7A7B7F

Preview Lab

Preview with #173F7B

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

Preview Lab → · Contrast checker → · Palette generator →