#173F7F#173F7F

#173F7F is a dark, moderate blue. Relative luminance 0.053; OKLCH L 37.8% C 0.117 H 259.6°. Best body text is #FFFFFF at 10.22:1 contrast (WCAG AA passes).

Color values

HEX	#173F7F
RGB	rgb(23, 63, 127)
HSL	hsl(217, 69%, 29%)
HSV	hsv(217, 82%, 50%)
CMYK	cmyk(81.9%, 50.4%, 0%, 50.2%)
CIE-LAB	lab(27.49, 11.20, -40.17)
CIE-LCH	lch(27.49, 41.70, 285.58°)
OKLab	oklab(37.85% -0.0212 -0.1155)
OKLCH	oklch(37.85% 0.117 259.6)
XYZ	xyz(5.9602, 5.2688, 20.7774)
Luminance	0.0527 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173F7F #7F5717

analogous

#17737F #173F7F #23177F

triadic

#173F7F #7F173F #3F7F17

tetradic

#173F7F #7F1773 #7F5717 #177F23

square

#173F7F #7F1773 #7F5717 #177F23

split-complementary

#173F7F #7F2317 #737F17

monochromatic

#050D1A #0E254B #173F7F #2059B3 #3675DB

Accessibility & contrast

On white

10.22

#173F7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#173F7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173F7F

10.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173F7F	#FFFFFF	#000000	##FFFFFF
##173F7F	1.00	10.22	2.05	10.22
#FFFFFF	10.22	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4681

Deuteranopia (green-blind)

#003C7E

Tritanopia (blue-blind)

#004E59

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #173f7f;
/* rgb */ color: rgb(23, 63, 127);
/* oklch */ color: oklch(37.8% 0.117 259.6);

Tailwind

colors: {
  custom: {
    50: '#6673a5',
    500: '#173f7f',
    950: '#000000',
  },
}

SCSS

$custom: #173f7f;
$custom-light: #6673a5;
$custom-dark: #000000;

JSON

{
  "hex": "#173f7f",
  "rgb": {
    "r": 23,
    "g": 63,
    "b": 127
  },
  "hsl": {
    "h": 216.923,
    "s": 69.333,
    "l": 29.412
  },
  "oklch": {
    "l": 0.37846,
    "c": 0.11742,
    "h": 259.6
  },
  "luminance": 0.05269
}

Semantic roles & 50–950 ramp

primary

#173F7F

secondary

#B4863E

accent

#A83CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #173F7F

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

Preview Lab → · Contrast checker → · Palette generator →