#173AA1#173AA1

#173AA1 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.7% C 0.171 H 264.8°. Best body text is #FFFFFF at 9.74:1 contrast (WCAG AA passes).

Color values

HEX	#173AA1
RGB	rgb(23, 58, 161)
HSL	hsl(225, 75%, 36%)
HSV	hsv(225, 86%, 63%)
CMYK	cmyk(85.7%, 64%, 0%, 36.9%)
CIE-LAB	lab(28.85, 28.48, -58.87)
CIE-LCH	lch(28.85, 65.40, 295.81°)
OKLab	oklab(39.74% -0.0154 -0.1705)
OKLCH	oklch(39.74% 0.171 264.8)
XYZ	xyz(8.2971, 5.7804, 34.3897)
Luminance	0.0578 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173AA1 #A17E17

analogous

#177FA1 #173AA1 #3917A1

triadic

#173AA1 #A1173A #3AA117

tetradic

#173AA1 #A1177F #A17E17 #17A139

square

#173AA1 #A1177F #A17E17 #17A139

split-complementary

#173AA1 #A13917 #7FA117

monochromatic

#081336 #0F276B #173AA1 #1F4DD7 #4D74E6

Accessibility & contrast

On white

9.74

#173AA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#173AA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173AA1

9.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173AA1	#FFFFFF	#000000	##FFFFFF
##173AA1	1.00	9.74	2.16	9.74
#FFFFFF	9.74	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BA4

Deuteranopia (green-blind)

#003E9F

Tritanopia (blue-blind)

#005568

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #173aa1;
/* rgb */ color: rgb(23, 58, 161);
/* oklch */ color: oklch(39.7% 0.171 264.8);

Tailwind

colors: {
  custom: {
    50: '#706fbe',
    500: '#173aa1',
    950: '#000000',
  },
}

SCSS

$custom: #173aa1;
$custom-light: #706fbe;
$custom-dark: #000000;

JSON

{
  "hex": "#173aa1",
  "rgb": {
    "r": 23,
    "g": 58,
    "b": 161
  },
  "hsl": {
    "h": 224.783,
    "s": 75,
    "l": 36.078
  },
  "oklch": {
    "l": 0.39743,
    "c": 0.1712,
    "h": 264.8
  },
  "luminance": 0.05781
}

Semantic roles & 50–950 ramp

primary

#173AA1

secondary

#C7A84C

accent

#C236F2

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #173AA1

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

Preview Lab → · Contrast checker → · Palette generator →