#1F3F8E#1F3F8E

#1F3F8E is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.4% C 0.137 H 264.3°. Best body text is #FFFFFF at 9.72:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F8E
RGB	rgb(31, 63, 142)
HSL	hsl(223, 64%, 34%)
HSV	hsv(223, 78%, 56%)
CMYK	cmyk(78.2%, 55.6%, 0%, 44.3%)
CIE-LAB	lab(28.90, 18.26, -47.18)
CIE-LCH	lch(28.90, 50.59, 291.16°)
OKLab	oklab(39.36% -0.0135 -0.136)
OKLCH	oklch(39.36% 0.137 264.3)
XYZ	xyz(7.2233, 5.7985, 26.3245)
Luminance	0.0580 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F8E #8E6E1F

analogous

#1F778E #1F3F8E #371F8E

triadic

#1F3F8E #8E1F3F #3F8E1F

tetradic

#1F3F8E #8E1F77 #8E6E1F #1F8E37

square

#1F3F8E #8E1F77 #8E6E1F #1F8E37

split-complementary

#1F3F8E #8E371F #778E1F

monochromatic

#09122A #14295C #1F3F8E #2A55C0 #4F77D9

Accessibility & contrast

On white

9.72

#1F3F8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1F3F8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F8E

9.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F8E	#FFFFFF	#000000	##FFFFFF
##1F3F8E	1.00	9.72	2.16	9.72
#FFFFFF	9.72	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004991

Deuteranopia (green-blind)

#003F8C

Tritanopia (blue-blind)

#005260

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f3f8e;
/* rgb */ color: rgb(31, 63, 142);
/* oklch */ color: oklch(39.4% 0.137 264.3);

Tailwind

colors: {
  custom: {
    50: '#6c73b0',
    500: '#1f3f8e',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f8e;
$custom-light: #6c73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f8e",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 142
  },
  "hsl": {
    "h": 222.703,
    "s": 64.162,
    "l": 33.922
  },
  "oklch": {
    "l": 0.39358,
    "c": 0.13667,
    "h": 264.3
  },
  "luminance": 0.05799
}

Semantic roles & 50–950 ramp

primary

#1F3F8E

secondary

#BB9C4D

accent

#B741E7

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #1F3F8E

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

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