#173DA1#173DA1

#173DA1 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.3% C 0.168 H 264.2°. Best body text is #FFFFFF at 9.47:1 contrast (WCAG AA passes).

Color values

HEX	#173DA1
RGB	rgb(23, 61, 161)
HSL	hsl(223, 75%, 36%)
HSV	hsv(223, 86%, 63%)
CMYK	cmyk(85.7%, 62.1%, 0%, 36.9%)
CIE-LAB	lab(29.64, 26.44, -57.58)
CIE-LCH	lch(29.64, 63.36, 294.67°)
OKLab	oklab(40.33% -0.017 -0.1667)
OKLCH	oklch(40.33% 0.168 264.2)
XYZ	xyz(8.4528, 6.0918, 34.4416)
Luminance	0.0609 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#173DA1 #A17B17

analogous

#1782A1 #173DA1 #3617A1

triadic

#173DA1 #A1173D #3DA117

tetradic

#173DA1 #A11782 #A17B17 #17A136

square

#173DA1 #A11782 #A17B17 #17A136

split-complementary

#173DA1 #A13617 #82A117

monochromatic

#081436 #0F296B #173DA1 #1F51D7 #4D77E6

Accessibility & contrast

On white

9.47

#173DA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#173DA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #173DA1

9.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##173DA1	#FFFFFF	#000000	##FFFFFF
##173DA1	1.00	9.47	2.22	9.47
#FFFFFF	9.47	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA4

Deuteranopia (green-blind)

#00409F

Tritanopia (blue-blind)

#005769

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #173da1;
/* rgb */ color: rgb(23, 61, 161);
/* oklch */ color: oklch(40.3% 0.168 264.2);

Tailwind

colors: {
  custom: {
    50: '#6f72be',
    500: '#173da1',
    950: '#000000',
  },
}

SCSS

$custom: #173da1;
$custom-light: #6f72be;
$custom-dark: #000000;

JSON

{
  "hex": "#173da1",
  "rgb": {
    "r": 23,
    "g": 61,
    "b": 161
  },
  "hsl": {
    "h": 223.478,
    "s": 75,
    "l": 36.078
  },
  "oklch": {
    "l": 0.40331,
    "c": 0.16754,
    "h": 264.2
  },
  "luminance": 0.06093
}

Semantic roles & 50–950 ramp

primary

#173DA1

secondary

#C7A64C

accent

#BE36F2

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #173DA1

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

Preview Lab → · Contrast checker → · Palette generator →