#1F428E#1F428E

#1F428E is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.0% C 0.133 H 263.1°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F428E
RGB	rgb(31, 66, 142)
HSL	hsl(221, 64%, 34%)
HSV	hsv(221, 78%, 56%)
CMYK	cmyk(78.2%, 53.5%, 0%, 44.3%)
CIE-LAB	lab(29.76, 16.19, -45.78)
CIE-LCH	lch(29.76, 48.56, 289.48°)
OKLab	oklab(40.01% -0.0159 -0.1318)
OKLCH	oklch(40.01% 0.133 263.1)
XYZ	xyz(7.3940, 6.1399, 26.3814)
Luminance	0.0614 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F428E #8E6B1F

analogous

#1F7A8E #1F428E #341F8E

triadic

#1F428E #8E1F42 #428E1F

tetradic

#1F428E #8E1F7A #8E6B1F #1F8E34

square

#1F428E #8E1F7A #8E6B1F #1F8E34

split-complementary

#1F428E #8E341F #7A8E1F

monochromatic

#09132A #142B5C #1F428E #2A59C0 #4F7AD9

Accessibility & contrast

On white

9.42

#1F428E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F428E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F428E

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F428E	#FFFFFF	#000000	##FFFFFF
##1F428E	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D4B91

Deuteranopia (green-blind)

#00418C

Tritanopia (blue-blind)

#005461

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f428e;
/* rgb */ color: rgb(31, 66, 142);
/* oklch */ color: oklch(40.0% 0.133 263.1);

Tailwind

colors: {
  custom: {
    50: '#6c75b0',
    500: '#1f428e',
    950: '#000000',
  },
}

SCSS

$custom: #1f428e;
$custom-light: #6c75b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f428e",
  "rgb": {
    "r": 31,
    "g": 66,
    "b": 142
  },
  "hsl": {
    "h": 221.081,
    "s": 64.162,
    "l": 33.922
  },
  "oklch": {
    "l": 0.40014,
    "c": 0.13278,
    "h": 263.1
  },
  "luminance": 0.06141
}

Semantic roles & 50–950 ramp

primary

#1F428E

secondary

#BB994D

accent

#B341E7

background

#F7F7FA

surface

#EDEDF5

border

#C8C8CF

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #1F428E

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

Preview Lab → · Contrast checker → · Palette generator →