#1F428C#1F428C

#1F428C is a dark, vivid blue. Relative luminance 0.061; OKLCH L 39.9% C 0.130 H 262.9°. Best body text is #FFFFFF at 9.48:1 contrast (WCAG AA passes).

Color values

HEX	#1F428C
RGB	rgb(31, 66, 140)
HSL	hsl(221, 64%, 34%)
HSV	hsv(221, 78%, 55%)
CMYK	cmyk(77.9%, 52.9%, 0%, 45.1%)
CIE-LAB	lab(29.61, 15.39, -44.79)
CIE-LCH	lch(29.61, 47.36, 288.96°)
OKLab	oklab(39.85% -0.0161 -0.1289)
OKLCH	oklch(39.85% 0.13 262.9)
XYZ	xyz(7.2452, 6.0804, 25.5976)
Luminance	0.0608 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F428C #8C691F

analogous

#1F788C #1F428C #321F8C

triadic

#1F428C #8C1F42 #428C1F

tetradic

#1F428C #8C1F78 #8C691F #1F8C32

square

#1F428C #8C1F78 #8C691F #1F8C32

split-complementary

#1F428C #8C321F #788C1F

monochromatic

#091328 #142A5A #1F428C #2A5ABE #4E7AD8

Accessibility & contrast

On white

9.48

#1F428C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#1F428C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F428C

9.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F428C	#FFFFFF	#000000	##FFFFFF
##1F428C	1.00	9.48	2.22	9.48
#FFFFFF	9.48	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#114B8F

Deuteranopia (green-blind)

#00418B

Tritanopia (blue-blind)

#005460

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f428c;
/* rgb */ color: rgb(31, 66, 140);
/* oklch */ color: oklch(39.9% 0.130 262.9);

Tailwind

colors: {
  custom: {
    50: '#6c75ae',
    500: '#1f428c',
    950: '#000000',
  },
}

SCSS

$custom: #1f428c;
$custom-light: #6c75ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f428c",
  "rgb": {
    "r": 31,
    "g": 66,
    "b": 140
  },
  "hsl": {
    "h": 220.734,
    "s": 63.743,
    "l": 33.529
  },
  "oklch": {
    "l": 0.39854,
    "c": 0.12991,
    "h": 262.9
  },
  "luminance": 0.06081
}

Semantic roles & 50–950 ramp

primary

#1F428C

secondary

#BB974C

accent

#B241E7

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F428C

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

Preview Lab → · Contrast checker → · Palette generator →