#172B57#172B57

#172B57 is a dark, moderate blue. Relative luminance 0.026; OKLCH L 29.9% C 0.084 H 263.7°. Best body text is #FFFFFF at 13.82:1 contrast (WCAG AA passes).

Color values

HEX	#172B57
RGB	rgb(23, 43, 87)
HSL	hsl(221, 58%, 22%)
HSV	hsv(221, 74%, 34%)
CMYK	cmyk(73.6%, 50.6%, 0%, 65.9%)
CIE-LAB	lab(18.35, 8.82, -29.04)
CIE-LCH	lch(18.35, 30.35, 286.89°)
OKLab	oklab(29.92% -0.0091 -0.0831)
OKLCH	oklch(29.92% 0.084 263.7)
XYZ	xyz(2.9369, 2.5977, 9.3616)
Luminance	0.0260 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172B57 #574317

analogous

#174B57 #172B57 #231757

triadic

#172B57 #57172B #2B5717

tetradic

#172B57 #57174B #574317 #175723

square

#172B57 #57174B #574317 #175723

split-complementary

#172B57 #572317 #4B5717

monochromatic

#060C18 #0A1327 #172B57 #244387 #315BB8

Accessibility & contrast

On white

13.82

#172B57 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.52

#172B57 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172B57

13.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172B57	#FFFFFF	#000000	##FFFFFF
##172B57	1.00	13.82	1.52	13.82
#FFFFFF	13.82	1.00	21.00	1.00
#000000	1.52	21.00	1.00	21.00
##FFFFFF	13.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#143059

Deuteranopia (green-blind)

#072A56

Tritanopia (blue-blind)

#00353C

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #172b57;
/* rgb */ color: rgb(23, 43, 87);
/* oklch */ color: oklch(29.9% 0.084 263.7);

Tailwind

colors: {
  custom: {
    50: '#5d6387',
    500: '#172b57',
    950: '#000000',
  },
}

SCSS

$custom: #172b57;
$custom-light: #5d6387;
$custom-dark: #000000;

JSON

{
  "hex": "#172b57",
  "rgb": {
    "r": 23,
    "g": 43,
    "b": 87
  },
  "hsl": {
    "h": 221.25,
    "s": 58.182,
    "l": 21.569
  },
  "oklch": {
    "l": 0.29916,
    "c": 0.08365,
    "h": 263.7
  },
  "luminance": 0.02598
}

Semantic roles & 50–950 ramp

primary

#172B57

secondary

#8E743C

accent

#B146E1

background

#F5F5F8

surface

#E9EAEF

border

#C5C6CA

text

#05050B

muted

#79797C

Preview Lab

Preview with #172B57

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

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