#1B237F#1B237F

#1B237F is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.2% C 0.152 H 270.7°. Best body text is #FFFFFF at 13.18:1 contrast (WCAG AA passes).

Color values

HEX	#1B237F
RGB	rgb(27, 35, 127)
HSL	hsl(235, 65%, 30%)
HSV	hsv(235, 79%, 50%)
CMYK	cmyk(78.7%, 72.4%, 0%, 50.2%)
CIE-LAB	lab(19.91, 31.08, -52.51)
CIE-LCH	lch(19.91, 61.02, 300.62°)
OKLab	oklab(32.24% 0.0017 -0.152)
OKLCH	oklch(32.24% 0.152 270.7)
XYZ	xyz(4.8825, 2.9669, 20.3899)
Luminance	0.0297 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B237F #7F771B

analogous

#1B557F #1B237F #451B7F

triadic

#1B237F #7F1B23 #237F1B

tetradic

#1B237F #7F1B55 #7F771B #1B7F45

square

#1B237F #7F1B55 #7F771B #1B7F45

split-complementary

#1B237F #7F451B #557F1B

monochromatic

#06071A #10154D #1B237F #2631B1 #3E4AD6

Accessibility & contrast

On white

13.18

#1B237F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#1B237F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B237F

13.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B237F	#FFFFFF	#000000	##FFFFFF
##1B237F	1.00	13.18	1.59	13.18
#FFFFFF	13.18	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003582

Deuteranopia (green-blind)

#002B7D

Tritanopia (blue-blind)

#003D4E

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b237f;
/* rgb */ color: rgb(27, 35, 127);
/* oklch */ color: oklch(32.2% 0.152 270.7);

Tailwind

colors: {
  custom: {
    50: '#6a5ea5',
    500: '#1b237f',
    950: '#000000',
  },
}

SCSS

$custom: #1b237f;
$custom-light: #6a5ea5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b237f",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 127
  },
  "hsl": {
    "h": 235.2,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.32236,
    "c": 0.15201,
    "h": 270.7
  },
  "luminance": 0.02967
}

Semantic roles & 50–950 ramp

primary

#1B237F

secondary

#B3AA43

accent

#DA40E8

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B237F

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

Preview Lab → · Contrast checker → · Palette generator →