#1737B4#1737B4

#1737B4 is a dark, vivid blue. Relative luminance 0.062; OKLCH L 41.1% C 0.199 H 265.7°. Best body text is #FFFFFF at 9.37:1 contrast (WCAG AA passes).

Color values

HEX	#1737B4
RGB	rgb(23, 55, 180)
HSL	hsl(228, 77%, 40%)
HSV	hsv(228, 87%, 71%)
CMYK	cmyk(87.2%, 69.4%, 0%, 29.4%)
CIE-LAB	lab(29.93, 37.70, -68.50)
CIE-LCH	lch(29.93, 78.19, 298.83°)
OKLab	oklab(41.09% -0.0148 -0.1986)
OKLCH	oklch(41.09% 0.199 265.7)
XYZ	xyz(9.9549, 6.2086, 43.8449)
Luminance	0.0621 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1737B4 #B49417

analogous

#1785B4 #1737B4 #4617B4

triadic

#1737B4 #B41737 #37B417

tetradic

#1737B4 #B41785 #B49417 #17B446

square

#1737B4 #B41785 #B49417 #17B446

split-complementary

#1737B4 #B44617 #85B417

monochromatic

#091647 #10267E #1737B4 #254CE3 #5B78EA

Accessibility & contrast

On white

9.37

#1737B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.24

#1737B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1737B4

9.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1737B4	#FFFFFF	#000000	##FFFFFF
##1737B4	1.00	9.37	2.24	9.37
#FFFFFF	9.37	1.00	21.00	1.00
#000000	2.24	21.00	1.00	21.00
##FFFFFF	9.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EB8

Deuteranopia (green-blind)

#003FB2

Tritanopia (blue-blind)

#005A71

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1737b4;
/* rgb */ color: rgb(23, 55, 180);
/* oklch */ color: oklch(41.1% 0.199 265.7);

Tailwind

colors: {
  custom: {
    50: '#756ecc',
    500: '#1737b4',
    950: '#000000',
  },
}

SCSS

$custom: #1737b4;
$custom-light: #756ecc;
$custom-dark: #000000;

JSON

{
  "hex": "#1737b4",
  "rgb": {
    "r": 23,
    "g": 55,
    "b": 180
  },
  "hsl": {
    "h": 227.771,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.41089,
    "c": 0.19917,
    "h": 265.7
  },
  "luminance": 0.0621
}

Semantic roles & 50–950 ramp

primary

#1737B4

secondary

#CEB659

accent

#CD34F4

background

#F7F6FC

surface

#EEEBF9

border

#C9C6D2

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #1737B4

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

Preview Lab → · Contrast checker → · Palette generator →