#1F237A#1F237A

#1F237A is a dark, vivid blue. Relative luminance 0.029; OKLCH L 31.9% C 0.144 H 272.8°. Best body text is #FFFFFF at 13.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F237A
RGB	rgb(31, 35, 122)
HSL	hsl(237, 59%, 30%)
HSV	hsv(237, 75%, 48%)
CMYK	cmyk(74.6%, 71.3%, 0%, 52.2%)
CIE-LAB	lab(19.63, 29.65, -49.78)
CIE-LCH	lch(19.63, 57.94, 300.78°)
OKLab	oklab(31.94% 0.007 -0.1439)
OKLCH	oklch(31.94% 0.144 272.8)
XYZ	xyz(4.6778, 2.8980, 18.7214)
Luminance	0.0290 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F237A #7A761F

analogous

#1F507A #1F237A #491F7A

triadic

#1F237A #7A1F23 #237A1F

tetradic

#1F237A #7A1F50 #7A761F #1F7A49

square

#1F237A #7A1F50 #7A761F #1F7A49

split-complementary

#1F237A #7A491F #507A1F

monochromatic

#060718 #131549 #1F237A #2B31AB #444ACF

Accessibility & contrast

On white

13.29

#1F237A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.58

#1F237A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F237A

13.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F237A	#FFFFFF	#000000	##FFFFFF
##1F237A	1.00	13.29	1.58	13.29
#FFFFFF	13.29	1.00	21.00	1.00
#000000	1.58	21.00	1.00	21.00
##FFFFFF	13.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347D

Deuteranopia (green-blind)

#002B78

Tritanopia (blue-blind)

#003B4B

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f237a;
/* rgb */ color: rgb(31, 35, 122);
/* oklch */ color: oklch(31.9% 0.144 272.8);

Tailwind

colors: {
  custom: {
    50: '#6a5ea1',
    500: '#1f237a',
    950: '#000000',
  },
}

SCSS

$custom: #1f237a;
$custom-light: #6a5ea1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f237a",
  "rgb": {
    "r": 31,
    "g": 35,
    "b": 122
  },
  "hsl": {
    "h": 237.363,
    "s": 59.477,
    "l": 30
  },
  "oklch": {
    "l": 0.31942,
    "c": 0.14411,
    "h": 272.8
  },
  "luminance": 0.02899
}

Semantic roles & 50–950 ramp

primary

#1F237A

secondary

#ADA947

accent

#DC45E3

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1F237A

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

Preview Lab → · Contrast checker → · Palette generator →