#1F4599#1F4599

#1F4599 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 41.6% C 0.144 H 263.2°. Best body text is #FFFFFF at 8.86:1 contrast (WCAG AA passes).

Color values

HEX	#1F4599
RGB	rgb(31, 69, 153)
HSL	hsl(221, 66%, 36%)
HSV	hsv(221, 80%, 60%)
CMYK	cmyk(79.7%, 54.9%, 0%, 40%)
CIE-LAB	lab(31.45, 18.53, -49.76)
CIE-LCH	lch(31.45, 53.10, 290.42°)
OKLab	oklab(41.56% -0.0171 -0.1435)
OKLCH	oklch(41.56% 0.145 263.2)
XYZ	xyz(8.4409, 6.8465, 31.0074)
Luminance	0.0685 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4599 #99731F

analogous

#1F8299 #1F4599 #361F99

triadic

#1F4599 #991F45 #45991F

tetradic

#1F4599 #991F82 #99731F #1F9936

square

#1F4599 #991F82 #99731F #1F9936

split-complementary

#1F4599 #99361F #82991F

monochromatic

#0A1733 #152E66 #1F4599 #295CCC #5680DD

Accessibility & contrast

On white

8.86

#1F4599 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.37

#1F4599 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4599

8.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4599	#FFFFFF	#000000	##FFFFFF
##1F4599	1.00	8.86	2.37	8.86
#FFFFFF	8.86	1.00	21.00	1.00
#000000	2.37	21.00	1.00	21.00
##FFFFFF	8.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00509C

Deuteranopia (green-blind)

#004597

Tritanopia (blue-blind)

#005A68

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #1f4599;
/* rgb */ color: rgb(31, 69, 153);
/* oklch */ color: oklch(41.6% 0.144 263.2);

Tailwind

colors: {
  custom: {
    50: '#6f78b8',
    500: '#1f4599',
    950: '#000000',
  },
}

SCSS

$custom: #1f4599;
$custom-light: #6f78b8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4599",
  "rgb": {
    "r": 31,
    "g": 69,
    "b": 153
  },
  "hsl": {
    "h": 221.311,
    "s": 66.304,
    "l": 36.078
  },
  "oklch": {
    "l": 0.41561,
    "c": 0.1445,
    "h": 263.2
  },
  "luminance": 0.06847
}

Semantic roles & 50–950 ramp

primary

#1F4599

secondary

#C09E54

accent

#B43FE9

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#080811

muted

#7B7B80

Preview Lab

Preview with #1F4599

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

Preview Lab → · Contrast checker → · Palette generator →