#1F428F#1F428F

#1F428F is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.1% C 0.134 H 263.2°. Best body text is #FFFFFF at 9.40:1 contrast (WCAG AA passes).

Color values

HEX	#1F428F
RGB	rgb(31, 66, 143)
HSL	hsl(221, 64%, 34%)
HSV	hsv(221, 78%, 56%)
CMYK	cmyk(78.3%, 53.8%, 0%, 43.9%)
CIE-LAB	lab(29.84, 16.59, -46.28)
CIE-LCH	lch(29.84, 49.16, 289.72°)
OKLab	oklab(40.09% -0.0158 -0.1333)
OKLCH	oklch(40.09% 0.134 263.2)
XYZ	xyz(7.4694, 6.1701, 26.7786)
Luminance	0.0617 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F428F #8F6C1F

analogous

#1F7A8F #1F428F #341F8F

triadic

#1F428F #8F1F42 #428F1F

tetradic

#1F428F #8F1F7A #8F6C1F #1F8F34

square

#1F428F #8F1F7A #8F6C1F #1F8F34

split-complementary

#1F428F #8F341F #7A8F1F

monochromatic

#09142A #142B5D #1F428F #2A59C1 #4F7AD9

Accessibility & contrast

On white

9.40

#1F428F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F428F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F428F

9.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F428F	#FFFFFF	#000000	##FFFFFF
##1F428F	1.00	9.40	2.23	9.40
#FFFFFF	9.40	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A4C92

Deuteranopia (green-blind)

#00418D

Tritanopia (blue-blind)

#005562

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f428f;
/* rgb */ color: rgb(31, 66, 143);
/* oklch */ color: oklch(40.1% 0.134 263.2);

Tailwind

colors: {
  custom: {
    50: '#6c75b0',
    500: '#1f428f',
    950: '#000000',
  },
}

SCSS

$custom: #1f428f;
$custom-light: #6c75b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f428f",
  "rgb": {
    "r": 31,
    "g": 66,
    "b": 143
  },
  "hsl": {
    "h": 221.25,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.40094,
    "c": 0.13421,
    "h": 263.2
  },
  "luminance": 0.06171
}

Semantic roles & 50–950 ramp

primary

#1F428F

secondary

#BC9A4E

accent

#B340E7

background

#F7F7FA

surface

#EDEDF5

border

#C8C8CF

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1F428F

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

Preview Lab → · Contrast checker → · Palette generator →