#1F237B#1F237B

#1F237B is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.0% C 0.145 H 272.7°. Best body text is #FFFFFF at 13.25:1 contrast (WCAG AA passes).

Color values

HEX	#1F237B
RGB	rgb(31, 35, 123)
HSL	hsl(237, 60%, 30%)
HSV	hsv(237, 75%, 48%)
CMYK	cmyk(74.8%, 71.5%, 0%, 51.8%)
CIE-LAB	lab(19.73, 30.02, -50.25)
CIE-LCH	lch(19.73, 58.54, 300.86°)
OKLab	oklab(32.05% 0.0069 -0.1453)
OKLCH	oklch(32.05% 0.145 272.7)
XYZ	xyz(4.7401, 2.9230, 19.0494)
Luminance	0.0292 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F237B #7B771F

analogous

#1F517B #1F237B #491F7B

triadic

#1F237B #7B1F23 #237B1F

tetradic

#1F237B #7B1F51 #7B771F #1F7B49

square

#1F237B #7B1F51 #7B771F #1F7B49

split-complementary

#1F237B #7B491F #517B1F

monochromatic

#060719 #13154A #1F237B #2B31AC #444AD0

Accessibility & contrast

On white

13.25

#1F237B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.58

#1F237B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F237B

13.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F237B	#FFFFFF	#000000	##FFFFFF
##1F237B	1.00	13.25	1.58	13.25
#FFFFFF	13.25	1.00	21.00	1.00
#000000	1.58	21.00	1.00	21.00
##FFFFFF	13.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347E

Deuteranopia (green-blind)

#002B79

Tritanopia (blue-blind)

#003B4C

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1f237b;
/* rgb */ color: rgb(31, 35, 123);
/* oklch */ color: oklch(32.0% 0.145 272.7);

Tailwind

colors: {
  custom: {
    50: '#6a5ea2',
    500: '#1f237b',
    950: '#000000',
  },
}

SCSS

$custom: #1f237b;
$custom-light: #6a5ea2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f237b",
  "rgb": {
    "r": 31,
    "g": 35,
    "b": 123
  },
  "hsl": {
    "h": 237.391,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.32046,
    "c": 0.14547,
    "h": 272.7
  },
  "luminance": 0.02923
}

Semantic roles & 50–950 ramp

primary

#1F237B

secondary

#AEAA48

accent

#DC45E3

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1F237B

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

Preview Lab → · Contrast checker → · Palette generator →