#1F3599#1F3599

#1F3599 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 38.3% C 0.165 H 267.8°. Best body text is #FFFFFF at 10.36:1 contrast (WCAG AA passes).

Color values

HEX	#1F3599
RGB	rgb(31, 53, 153)
HSL	hsl(229, 66%, 36%)
HSV	hsv(229, 80%, 60%)
CMYK	cmyk(79.7%, 65.4%, 0%, 40%)
CIE-LAB	lab(27.12, 29.41, -56.83)
CIE-LCH	lch(27.12, 63.99, 297.36°)
OKLab	oklab(38.32% -0.0064 -0.1645)
OKLCH	oklch(38.32% 0.165 267.8)
XYZ	xyz(7.5859, 5.1366, 30.7225)
Luminance	0.0514 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3599 #99831F

analogous

#1F7299 #1F3599 #461F99

triadic

#1F3599 #991F35 #35991F

tetradic

#1F3599 #991F72 #99831F #1F9946

square

#1F3599 #991F72 #99831F #1F9946

split-complementary

#1F3599 #99461F #72991F

monochromatic

#0A1233 #152366 #1F3599 #2947CC #566EDD

Accessibility & contrast

On white

10.36

#1F3599 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1F3599 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3599

10.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3599	#FFFFFF	#000000	##FFFFFF
##1F3599	1.00	10.36	2.03	10.36
#FFFFFF	10.36	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00469C

Deuteranopia (green-blind)

#003A97

Tritanopia (blue-blind)

#004F62

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f3599;
/* rgb */ color: rgb(31, 53, 153);
/* oklch */ color: oklch(38.3% 0.165 267.8);

Tailwind

colors: {
  custom: {
    50: '#706cb8',
    500: '#1f3599',
    950: '#000000',
  },
}

SCSS

$custom: #1f3599;
$custom-light: #706cb8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3599",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 153
  },
  "hsl": {
    "h": 229.18,
    "s": 66.304,
    "l": 36.078
  },
  "oklch": {
    "l": 0.38322,
    "c": 0.16458,
    "h": 267.8
  },
  "luminance": 0.05137
}

Semantic roles & 50–950 ramp

primary

#1F3599

secondary

#C0AD54

accent

#CA3FE9

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #1F3599

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

Preview Lab → · Contrast checker → · Palette generator →