#172D5B#172D5B

#172D5B is a dark, moderate blue. Relative luminance 0.028; OKLCH L 30.7% C 0.087 H 263.0°. Best body text is #FFFFFF at 13.44:1 contrast (WCAG AA passes).

Color values

HEX	#172D5B
RGB	rgb(23, 45, 91)
HSL	hsl(221, 60%, 22%)
HSV	hsv(221, 75%, 36%)
CMYK	cmyk(74.7%, 50.5%, 0%, 64.3%)
CIE-LAB	lab(19.28, 9.02, -30.21)
CIE-LCH	lch(19.28, 31.53, 286.63°)
OKLab	oklab(30.72% -0.0106 -0.0866)
OKLCH	oklch(30.72% 0.087 263)
XYZ	xyz(3.1794, 2.8139, 10.2711)
Luminance	0.0281 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#172D5B #5B4517

analogous

#174F5B #172D5B #23175B

triadic

#172D5B #5B172D #2D5B17

tetradic

#172D5B #5B174F #5B4517 #175B23

square

#172D5B #5B174F #5B4517 #175B23

split-complementary

#172D5B #5B2317 #4F5B17

monochromatic

#060C18 #0B152A #172D5B #23458C #305DBD

Accessibility & contrast

On white

13.44

#172D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#172D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #172D5B

13.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##172D5B	#FFFFFF	#000000	##FFFFFF
##172D5B	1.00	13.44	1.56	13.44
#FFFFFF	13.44	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#15325D

Deuteranopia (green-blind)

#062C5A

Tritanopia (blue-blind)

#00383F

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #172d5b;
/* rgb */ color: rgb(23, 45, 91);
/* oklch */ color: oklch(30.7% 0.087 263.0);

Tailwind

colors: {
  custom: {
    50: '#5e658a',
    500: '#172d5b',
    950: '#000000',
  },
}

SCSS

$custom: #172d5b;
$custom-light: #5e658a;
$custom-dark: #000000;

JSON

{
  "hex": "#172d5b",
  "rgb": {
    "r": 23,
    "g": 45,
    "b": 91
  },
  "hsl": {
    "h": 220.588,
    "s": 59.649,
    "l": 22.353
  },
  "oklch": {
    "l": 0.3072,
    "c": 0.0872,
    "h": 263
  },
  "luminance": 0.02814
}

Semantic roles & 50–950 ramp

primary

#172D5B

secondary

#92763C

accent

#B045E3

background

#F5F6F8

surface

#E9EBF0

border

#C5C6CB

text

#05050B

muted

#797A7C

Preview Lab

Preview with #172D5B

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

Preview Lab → · Contrast checker → · Palette generator →