#1F539D#1F539D

#1F539D is a dark, vivid blue. Relative luminance 0.089; OKLCH L 45.0% C 0.133 H 258.0°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#1F539D
RGB	rgb(31, 83, 157)
HSL	hsl(215, 67%, 37%)
HSV	hsv(215, 80%, 62%)
CMYK	cmyk(80.3%, 47.1%, 0%, 38.4%)
CIE-LAB	lab(35.81, 10.66, -45.14)
CIE-LCH	lch(35.81, 46.39, 283.29°)
OKLab	oklab(44.98% -0.0276 -0.1296)
OKLCH	oklch(44.98% 0.133 258)
XYZ	xyz(9.7419, 8.9110, 33.0983)
Luminance	0.0891 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F539D #9D691F

analogous

#1F929D #1F539D #2A1F9D

triadic

#1F539D #9D1F53 #539D1F

tetradic

#1F539D #9D1F92 #9D691F #1F9D2A

square

#1F539D #9D1F92 #9D691F #1F9D2A

split-complementary

#1F539D #9D2A1F #929D1F

monochromatic

#0B1D37 #15386A #1F539D #296ED0 #5890DE

Accessibility & contrast

On white

7.55

#1F539D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#1F539D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F539D

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F539D	#FFFFFF	#000000	##FFFFFF
##1F539D	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B5AA0

Deuteranopia (green-blind)

#094F9C

Tritanopia (blue-blind)

#006570

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #1f539d;
/* rgb */ color: rgb(31, 83, 157);
/* oklch */ color: oklch(45.0% 0.133 258.0);

Tailwind

colors: {
  custom: {
    50: '#6f82ba',
    500: '#1f539d',
    950: '#000000',
  },
}

SCSS

$custom: #1f539d;
$custom-light: #6f82ba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f539d",
  "rgb": {
    "r": 31,
    "g": 83,
    "b": 157
  },
  "hsl": {
    "h": 215.238,
    "s": 67.021,
    "l": 36.863
  },
  "oklch": {
    "l": 0.44984,
    "c": 0.13252,
    "h": 258
  },
  "luminance": 0.08912
}

Semantic roles & 50–950 ramp

primary

#1F539D

secondary

#C29556

accent

#A33EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F539D

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

Preview Lab → · Contrast checker → · Palette generator →