#1F3DB4#1F3DB4

#1F3DB4 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.4% C 0.191 H 266.5°. Best body text is #FFFFFF at 8.81:1 contrast (WCAG AA passes).

Color values

HEX	#1F3DB4
RGB	rgb(31, 61, 180)
HSL	hsl(228, 71%, 41%)
HSV	hsv(228, 83%, 71%)
CMYK	cmyk(82.8%, 66.1%, 0%, 29.4%)
CIE-LAB	lab(31.63, 34.37, -65.69)
CIE-LCH	lch(31.63, 74.14, 297.62°)
OKLab	oklab(42.4% -0.0116 -0.1903)
OKLCH	oklch(42.4% 0.191 266.5)
XYZ	xyz(10.4691, 6.9228, 43.9556)
Luminance	0.0692 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3DB4 #B4961F

analogous

#1F88B4 #1F3DB4 #4B1FB4

triadic

#1F3DB4 #B41F3D #3DB41F

tetradic

#1F3DB4 #B41F88 #B4961F #1FB44B

square

#1F3DB4 #B41F88 #B4961F #1FB44B

split-complementary

#1F3DB4 #B44B1F #88B41F

monochromatic

#0D1A4C #162B80 #1F3DB4 #3456DC #6881E5

Accessibility & contrast

On white

8.81

#1F3DB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#1F3DB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3DB4

8.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3DB4	#FFFFFF	#000000	##FFFFFF
##1F3DB4	1.00	8.81	2.38	8.81
#FFFFFF	8.81	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B8

Deuteranopia (green-blind)

#0043B2

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #1f3db4;
/* rgb */ color: rgb(31, 61, 180);
/* oklch */ color: oklch(42.4% 0.191 266.5);

Tailwind

colors: {
  custom: {
    50: '#7672cc',
    500: '#1f3db4',
    950: '#000000',
  },
}

SCSS

$custom: #1f3db4;
$custom-light: #7672cc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3db4",
  "rgb": {
    "r": 31,
    "g": 61,
    "b": 180
  },
  "hsl": {
    "h": 227.919,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.42402,
    "c": 0.19066,
    "h": 266.5
  },
  "luminance": 0.06924
}

Semantic roles & 50–950 ramp

primary

#1F3DB4

secondary

#CBB664

accent

#C93AED

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F3DB4

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

Preview Lab → · Contrast checker → · Palette generator →