#1F428D#1F428D

#1F428D is a dark, vivid blue. Relative luminance 0.061; OKLCH L 39.9% C 0.131 H 263.0°. Best body text is #FFFFFF at 9.45:1 contrast (WCAG AA passes).

Color values

HEX	#1F428D
RGB	rgb(31, 66, 141)
HSL	hsl(221, 64%, 34%)
HSV	hsv(221, 78%, 55%)
CMYK	cmyk(78%, 53.2%, 0%, 44.7%)
CIE-LAB	lab(29.69, 15.79, -45.29)
CIE-LCH	lch(29.69, 47.96, 289.22°)
OKLab	oklab(39.93% -0.016 -0.1304)
OKLCH	oklch(39.93% 0.131 263)
XYZ	xyz(7.3193, 6.1100, 25.9877)
Luminance	0.0611 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F428D #8D6A1F

analogous

#1F798D #1F428D #331F8D

triadic

#1F428D #8D1F42 #428D1F

tetradic

#1F428D #8D1F79 #8D6A1F #1F8D33

square

#1F428D #8D1F79 #8D6A1F #1F8D33

split-complementary

#1F428D #8D331F #798D1F

monochromatic

#091329 #142B5B #1F428D #2A59BF #4E7AD8

Accessibility & contrast

On white

9.45

#1F428D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#1F428D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F428D

9.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F428D	#FFFFFF	#000000	##FFFFFF
##1F428D	1.00	9.45	2.22	9.45
#FFFFFF	9.45	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F4B90

Deuteranopia (green-blind)

#00418C

Tritanopia (blue-blind)

#005461

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f428d;
/* rgb */ color: rgb(31, 66, 141);
/* oklch */ color: oklch(39.9% 0.131 263.0);

Tailwind

colors: {
  custom: {
    50: '#6c75af',
    500: '#1f428d',
    950: '#000000',
  },
}

SCSS

$custom: #1f428d;
$custom-light: #6c75af;
$custom-dark: #000000;

JSON

{
  "hex": "#1f428d",
  "rgb": {
    "r": 31,
    "g": 66,
    "b": 141
  },
  "hsl": {
    "h": 220.909,
    "s": 63.953,
    "l": 33.725
  },
  "oklch": {
    "l": 0.39934,
    "c": 0.13135,
    "h": 263
  },
  "luminance": 0.06111
}

Semantic roles & 50–950 ramp

primary

#1F428D

secondary

#BB984D

accent

#B241E7

background

#F7F7FA

surface

#EDEDF4

border

#C8C8CE

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #1F428D

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

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