#173A7F#173A7F

#173A7F is a dark, vivid blue. Relative luminance 0.047; OKLCH L 36.7% C 0.124 H 262.0°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#173A7F
RGB	rgb(23, 58, 127)
HSL	hsl(220, 69%, 29%)
HSV	hsv(220, 82%, 50%)
CMYK	cmyk(81.9%, 54.3%, 0%, 50.2%)
CIE-LAB	lab(25.98, 14.71, -42.60)
CIE-LCH	lch(25.98, 45.07, 289.05°)
OKLab	oklab(36.69% -0.0172 -0.1228)
OKLCH	oklch(36.69% 0.124 262)
XYZ	xyz(5.6958, 4.7399, 20.6893)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173A7F #7F5C17

analogous

#176E7F #173A7F #28177F

triadic

#173A7F #7F173A #3A7F17

tetradic

#173A7F #7F176E #7F5C17 #177F28

square

#173A7F #7F176E #7F5C17 #177F28

split-complementary

#173A7F #7F2817 #6E7F17

monochromatic

#050C1A #0E224B #173A7F #2052B3 #366DDB

Accessibility & contrast

On white

10.78

#173A7F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#173A7F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173A7F

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173A7F	#FFFFFF	#000000	##FFFFFF
##173A7F	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#084381

Deuteranopia (green-blind)

#00397E

Tritanopia (blue-blind)

#004B56

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #173a7f;
/* rgb */ color: rgb(23, 58, 127);
/* oklch */ color: oklch(36.7% 0.124 262.0);

Tailwind

colors: {
  custom: {
    50: '#666fa5',
    500: '#173a7f',
    950: '#000000',
  },
}

SCSS

$custom: #173a7f;
$custom-light: #666fa5;
$custom-dark: #000000;

JSON

{
  "hex": "#173a7f",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 127
  },
  "hsl": {
    "h": 219.808,
    "s": 69.333,
    "l": 29.412
  },
  "oklch": {
    "l": 0.36694,
    "c": 0.12395,
    "h": 262
  },
  "luminance": 0.04741
}

Semantic roles & 50–950 ramp

primary

#173A7F

secondary

#B48C3E

accent

#B13CEC

background

#F6F6FA

surface

#EBECF4

border

#C6C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #173A7F

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

Preview Lab → · Contrast checker → · Palette generator →