#1F3588#1F3588

#1F3588 is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.7% C 0.141 H 267.5°. Best body text is #FFFFFF at 10.92:1 contrast (WCAG AA passes).

Color values

HEX	#1F3588
RGB	rgb(31, 53, 136)
HSL	hsl(227, 63%, 33%)
HSV	hsv(227, 77%, 53%)
CMYK	cmyk(77.2%, 61%, 0%, 46.7%)
CIE-LAB	lab(25.61, 22.80, -48.82)
CIE-LCH	lch(25.61, 53.88, 295.04°)
OKLab	oklab(36.73% -0.0062 -0.141)
OKLCH	oklch(36.73% 0.141 267.5)
XYZ	xyz(6.2806, 4.6144, 23.8474)
Luminance	0.0461 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3588 #88721F

analogous

#1F6988 #1F3588 #3E1F88

triadic

#1F3588 #881F35 #35881F

tetradic

#1F3588 #881F69 #88721F #1F883E

square

#1F3588 #881F69 #88721F #1F883E

split-complementary

#1F3588 #883E1F #69881F

monochromatic

#080E24 #142256 #1F3588 #2A48BA #4B68D6

Accessibility & contrast

On white

10.92

#1F3588 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1F3588 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3588

10.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3588	#FFFFFF	#000000	##FFFFFF
##1F3588	1.00	10.92	1.92	10.92
#FFFFFF	10.92	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00428B

Deuteranopia (green-blind)

#003886

Tritanopia (blue-blind)

#004A59

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1f3588;
/* rgb */ color: rgb(31, 53, 136);
/* oklch */ color: oklch(36.7% 0.141 267.5);

Tailwind

colors: {
  custom: {
    50: '#6c6bab',
    500: '#1f3588',
    950: '#000000',
  },
}

SCSS

$custom: #1f3588;
$custom-light: #6c6bab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3588",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 136
  },
  "hsl": {
    "h": 227.429,
    "s": 62.874,
    "l": 32.745
  },
  "oklch": {
    "l": 0.36733,
    "c": 0.14112,
    "h": 267.5
  },
  "luminance": 0.04615
}

Semantic roles & 50–950 ramp

primary

#1F3588

secondary

#B9A24A

accent

#C442E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1F3588

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

Preview Lab → · Contrast checker → · Palette generator →