#173AB4#173AB4

#173AB4 is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.6% C 0.196 H 265.4°. Best body text is #FFFFFF at 9.13:1 contrast (WCAG AA passes).

Color values

HEX	#173AB4
RGB	rgb(23, 58, 180)
HSL	hsl(227, 77%, 40%)
HSV	hsv(227, 87%, 71%)
CMYK	cmyk(87.2%, 67.8%, 0%, 29.4%)
CIE-LAB	lab(30.65, 35.78, -67.32)
CIE-LCH	lch(30.65, 76.24, 297.99°)
OKLab	oklab(41.61% -0.0159 -0.1952)
OKLCH	oklch(41.61% 0.196 265.4)
XYZ	xyz(10.1017, 6.5023, 43.8938)
Luminance	0.0650 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173AB4 #B49117

analogous

#1789B4 #173AB4 #4217B4

triadic

#173AB4 #B4173A #3AB417

tetradic

#173AB4 #B41789 #B49117 #17B442

square

#173AB4 #B41789 #B49117 #17B442

split-complementary

#173AB4 #B44217 #89B417

monochromatic

#091747 #10297E #173AB4 #254FE3 #5B7BEA

Accessibility & contrast

On white

9.13

#173AB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#173AB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173AB4

9.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173AB4	#FFFFFF	#000000	##FFFFFF
##173AB4	1.00	9.13	2.30	9.13
#FFFFFF	9.13	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B8

Deuteranopia (green-blind)

#0041B2

Tritanopia (blue-blind)

#005C72

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #173ab4;
/* rgb */ color: rgb(23, 58, 180);
/* oklch */ color: oklch(41.6% 0.196 265.4);

Tailwind

colors: {
  custom: {
    50: '#7570cc',
    500: '#173ab4',
    950: '#000000',
  },
}

SCSS

$custom: #173ab4;
$custom-light: #7570cc;
$custom-dark: #000000;

JSON

{
  "hex": "#173ab4",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 180
  },
  "hsl": {
    "h": 226.624,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.41609,
    "c": 0.19582,
    "h": 265.4
  },
  "luminance": 0.06504
}

Semantic roles & 50–950 ramp

primary

#173AB4

secondary

#CEB459

accent

#C934F4

background

#F7F6FC

surface

#EEECF9

border

#C9C7D2

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #173AB4

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

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