#1F37A6#1F37A6

#1F37A6 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 40.0% C 0.179 H 267.4°. Best body text is #FFFFFF at 9.74:1 contrast (WCAG AA passes).

Color values

HEX	#1F37A6
RGB	rgb(31, 55, 166)
HSL	hsl(229, 69%, 39%)
HSV	hsv(229, 81%, 65%)
CMYK	cmyk(81.3%, 66.9%, 0%, 34.9%)
CIE-LAB	lab(28.84, 33.02, -61.90)
CIE-LCH	lch(28.84, 70.16, 298.08°)
OKLab	oklab(39.96% -0.0081 -0.1793)
OKLCH	oklch(39.96% 0.179 267.4)
XYZ	xyz(8.8118, 5.7758, 36.7194)
Luminance	0.0578 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F37A6 #A68E1F

analogous

#1F7AA6 #1F37A6 #4A1FA6

triadic

#1F37A6 #A61F37 #37A61F

tetradic

#1F37A6 #A61F7A #A68E1F #1FA64A

square

#1F37A6 #A61F7A #A68E1F #1FA64A

split-complementary

#1F37A6 #A64A1F #7AA61F

monochromatic

#0C153F #152672 #1F37A6 #2B49D7 #5E76E1

Accessibility & contrast

On white

9.74

#1F37A6 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1F37A6 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F37A6

9.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F37A6	#FFFFFF	#000000	##FFFFFF
##1F37A6	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)

#004BA9

Deuteranopia (green-blind)

#003EA4

Tritanopia (blue-blind)

#005569

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f37a6;
/* rgb */ color: rgb(31, 55, 166);
/* oklch */ color: oklch(40.0% 0.179 267.4);

Tailwind

colors: {
  custom: {
    50: '#736dc1',
    500: '#1f37a6',
    950: '#000000',
  },
}

SCSS

$custom: #1f37a6;
$custom-light: #736dc1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f37a6",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 166
  },
  "hsl": {
    "h": 229.333,
    "s": 68.528,
    "l": 38.627
  },
  "oklch": {
    "l": 0.39956,
    "c": 0.17945,
    "h": 267.4
  },
  "luminance": 0.05777
}

Semantic roles & 50–950 ramp

primary

#1F37A6

secondary

#C5B35B

accent

#CC3CEB

background

#F7F6FC

surface

#EEEBF8

border

#C9C6D1

text

#0A0712

muted

#7C7A81

Preview Lab

Preview with #1F37A6

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

Preview Lab → · Contrast checker → · Palette generator →