#1F428A#1F428A

#1F428A is a dark, vivid blue. Relative luminance 0.060; OKLCH L 39.7% C 0.127 H 262.6°. Best body text is #FFFFFF at 9.53:1 contrast (WCAG AA passes).

Color values

HEX	#1F428A
RGB	rgb(31, 66, 138)
HSL	hsl(220, 63%, 33%)
HSV	hsv(220, 78%, 54%)
CMYK	cmyk(77.5%, 52.2%, 0%, 45.9%)
CIE-LAB	lab(29.47, 14.59, -43.79)
CIE-LCH	lch(29.47, 46.16, 288.42°)
OKLab	oklab(39.7% -0.0164 -0.126)
OKLCH	oklch(39.7% 0.127 262.6)
XYZ	xyz(7.0991, 6.0219, 24.8280)
Luminance	0.0602 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F428A #8A671F

analogous

#1F778A #1F428A #311F8A

triadic

#1F428A #8A1F42 #428A1F

tetradic

#1F428A #8A1F77 #8A671F #1F8A31

square

#1F428A #8A1F77 #8A671F #1F8A31

split-complementary

#1F428A #8A311F #778A1F

monochromatic

#091226 #142A58 #1F428A #2A5ABC #4C7AD7

Accessibility & contrast

On white

9.53

#1F428A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#1F428A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F428A

9.53:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F428A	#FFFFFF	#000000	##FFFFFF
##1F428A	1.00	9.53	2.20	9.53
#FFFFFF	9.53	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.53	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#154B8D

Deuteranopia (green-blind)

#004189

Tritanopia (blue-blind)

#00535F

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #1f428a;
/* rgb */ color: rgb(31, 66, 138);
/* oklch */ color: oklch(39.7% 0.127 262.6);

Tailwind

colors: {
  custom: {
    50: '#6b75ad',
    500: '#1f428a',
    950: '#000000',
  },
}

SCSS

$custom: #1f428a;
$custom-light: #6b75ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f428a",
  "rgb": {
    "r": 31,
    "g": 66,
    "b": 138
  },
  "hsl": {
    "h": 220.374,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.39695,
    "c": 0.12704,
    "h": 262.6
  },
  "luminance": 0.06023
}

Semantic roles & 50–950 ramp

primary

#1F428A

secondary

#BA954B

accent

#B041E6

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F428A

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

Preview Lab → · Contrast checker → · Palette generator →