#1F37B4#1F37B4

#1F37B4 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 41.4% C 0.197 H 267.4°. Best body text is #FFFFFF at 9.28:1 contrast (WCAG AA passes).

Color values

HEX	#1F37B4
RGB	rgb(31, 55, 180)
HSL	hsl(230, 71%, 41%)
HSV	hsv(230, 83%, 71%)
CMYK	cmyk(82.8%, 69.4%, 0%, 29.4%)
CIE-LAB	lab(30.20, 38.21, -68.05)
CIE-LCH	lch(30.20, 78.04, 299.31°)
OKLab	oklab(41.36% -0.009 -0.1972)
OKLCH	oklch(41.36% 0.197 267.4)
XYZ	xyz(10.1666, 6.3177, 43.8548)
Luminance	0.0632 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.54

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F37B4 #B49C1F

analogous

#1F82B4 #1F37B4 #521FB4

triadic

#1F37B4 #B41F37 #37B41F

tetradic

#1F37B4 #B41F82 #B49C1F #1FB452

square

#1F37B4 #B41F82 #B49C1F #1FB452

split-complementary

#1F37B4 #B4521F #82B41F

monochromatic

#0D174C #162780 #1F37B4 #344FDC #687CE5

Accessibility & contrast

On white

9.28

#1F37B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#1F37B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F37B4

9.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F37B4	#FFFFFF	#000000	##FFFFFF
##1F37B4	1.00	9.28	2.26	9.28
#FFFFFF	9.28	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EB8

Deuteranopia (green-blind)

#0040B2

Tritanopia (blue-blind)

#005A71

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f37b4;
/* rgb */ color: rgb(31, 55, 180);
/* oklch */ color: oklch(41.4% 0.197 267.4);

Tailwind

colors: {
  custom: {
    50: '#776ecc',
    500: '#1f37b4',
    950: '#000000',
  },
}

SCSS

$custom: #1f37b4;
$custom-light: #776ecc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f37b4",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 180
  },
  "hsl": {
    "h": 230.336,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.41359,
    "c": 0.1974,
    "h": 267.4
  },
  "luminance": 0.06319
}

Semantic roles & 50–950 ramp

primary

#1F37B4

secondary

#CBBA64

accent

#D13AED

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #1F37B4

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

Preview Lab → · Contrast checker → · Palette generator →