#1F4DB4#1F4DB4

#1F4DB4 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.5% C 0.171 H 263.1°. Best body text is #FFFFFF at 7.56:1 contrast (WCAG AA passes).

Color values

HEX	#1F4DB4
RGB	rgb(31, 77, 180)
HSL	hsl(221, 71%, 41%)
HSV	hsv(221, 83%, 71%)
CMYK	cmyk(82.8%, 57.2%, 0%, 29.4%)
CIE-LAB	lab(35.78, 23.79, -58.91)
CIE-LCH	lch(35.78, 63.53, 291.99°)
OKLab	oklab(45.49% -0.0205 -0.1702)
OKLCH	oklch(45.49% 0.171 263.1)
XYZ	xyz(11.4542, 8.8930, 44.2840)
Luminance	0.0889 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4DB4 #B4861F

analogous

#1F98B4 #1F4DB4 #3C1FB4

triadic

#1F4DB4 #B41F4D #4DB41F

tetradic

#1F4DB4 #B41F98 #B4861F #1FB43C

square

#1F4DB4 #B41F98 #B4861F #1FB43C

split-complementary

#1F4DB4 #B43C1F #98B41F

monochromatic

#0D204C #163780 #1F4DB4 #3468DC #688FE5

Accessibility & contrast

On white

7.56

#1F4DB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#1F4DB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4DB4

7.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4DB4	#FFFFFF	#000000	##FFFFFF
##1F4DB4	1.00	7.56	2.78	7.56
#FFFFFF	7.56	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BB8

Deuteranopia (green-blind)

#004EB2

Tritanopia (blue-blind)

#006779

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #1f4db4;
/* rgb */ color: rgb(31, 77, 180);
/* oklch */ color: oklch(45.5% 0.171 263.1);

Tailwind

colors: {
  custom: {
    50: '#757ecb',
    500: '#1f4db4',
    950: '#000000',
  },
}

SCSS

$custom: #1f4db4;
$custom-light: #757ecb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4db4",
  "rgb": {
    "r": 31,
    "g": 77,
    "b": 180
  },
  "hsl": {
    "h": 221.477,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.45487,
    "c": 0.17145,
    "h": 263.1
  },
  "luminance": 0.08894
}

Semantic roles & 50–950 ramp

primary

#1F4DB4

secondary

#CBAB64

accent

#B63AED

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0913

muted

#7C7B82

Preview Lab

Preview with #1F4DB4

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

Preview Lab → · Contrast checker → · Palette generator →