#1F3A9D#1F3A9D

#1F3A9D is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.7% C 0.164 H 266.7°. Best body text is #FFFFFF at 9.77:1 contrast (WCAG AA passes).

Color values

HEX	#1F3A9D
RGB	rgb(31, 58, 157)
HSL	hsl(227, 67%, 37%)
HSV	hsv(227, 80%, 62%)
CMYK	cmyk(80.3%, 63.1%, 0%, 38.4%)
CIE-LAB	lab(28.77, 27.59, -56.56)
CIE-LCH	lch(28.77, 62.93, 296.01°)
OKLab	oklab(39.66% -0.0095 -0.1636)
OKLCH	oklch(39.66% 0.164 266.7)
XYZ	xyz(8.1618, 5.7508, 32.5716)
Luminance	0.0575 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3A9D #9D821F

analogous

#1F799D #1F3A9D #431F9D

triadic

#1F3A9D #9D1F3A #3A9D1F

tetradic

#1F3A9D #9D1F79 #9D821F #1F9D43

square

#1F3A9D #9D1F79 #9D821F #1F9D43

split-complementary

#1F3A9D #9D431F #799D1F

monochromatic

#0B1437 #15276A #1F3A9D #294DD0 #5875DE

Accessibility & contrast

On white

9.77

#1F3A9D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#1F3A9D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3A9D

9.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3A9D	#FFFFFF	#000000	##FFFFFF
##1F3A9D	1.00	9.77	2.15	9.77
#FFFFFF	9.77	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA0

Deuteranopia (green-blind)

#003E9B

Tritanopia (blue-blind)

#005466

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f3a9d;
/* rgb */ color: rgb(31, 58, 157);
/* oklch */ color: oklch(39.7% 0.164 266.7);

Tailwind

colors: {
  custom: {
    50: '#716fbb',
    500: '#1f3a9d',
    950: '#000000',
  },
}

SCSS

$custom: #1f3a9d;
$custom-light: #716fbb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3a9d",
  "rgb": {
    "r": 31,
    "g": 58,
    "b": 157
  },
  "hsl": {
    "h": 227.143,
    "s": 67.021,
    "l": 36.863
  },
  "oklch": {
    "l": 0.39655,
    "c": 0.16388,
    "h": 266.7
  },
  "luminance": 0.05752
}

Semantic roles & 50–950 ramp

primary

#1F3A9D

secondary

#C2AB56

accent

#C53EEA

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F3A9D

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

Preview Lab → · Contrast checker → · Palette generator →