#1B237E#1B237E

#1B237E is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.1% C 0.151 H 270.7°. Best body text is #FFFFFF at 13.22:1 contrast (WCAG AA passes).

Color values

HEX	#1B237E
RGB	rgb(27, 35, 126)
HSL	hsl(235, 65%, 30%)
HSV	hsv(235, 79%, 49%)
CMYK	cmyk(78.6%, 72.2%, 0%, 50.6%)
CIE-LAB	lab(19.81, 30.71, -52.05)
CIE-LCH	lch(19.81, 60.43, 300.54°)
OKLab	oklab(32.13% 0.0019 -0.1506)
OKLCH	oklch(32.13% 0.151 270.7)
XYZ	xyz(4.8176, 2.9409, 20.0484)
Luminance	0.0294 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B237E #7E761B

analogous

#1B547E #1B237E #451B7E

triadic

#1B237E #7E1B23 #237E1B

tetradic

#1B237E #7E1B54 #7E761B #1B7E45

square

#1B237E #7E1B54 #7E761B #1B7E45

split-complementary

#1B237E #7E451B #547E1B

monochromatic

#050719 #10154C #1B237E #2631B0 #3E4AD6

Accessibility & contrast

On white

13.22

#1B237E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#1B237E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B237E

13.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B237E	#FFFFFF	#000000	##FFFFFF
##1B237E	1.00	13.22	1.59	13.22
#FFFFFF	13.22	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003581

Deuteranopia (green-blind)

#002B7C

Tritanopia (blue-blind)

#003C4D

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b237e;
/* rgb */ color: rgb(27, 35, 126);
/* oklch */ color: oklch(32.1% 0.151 270.7);

Tailwind

colors: {
  custom: {
    50: '#695ea4',
    500: '#1b237e',
    950: '#000000',
  },
}

SCSS

$custom: #1b237e;
$custom-light: #695ea4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b237e",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 126
  },
  "hsl": {
    "h": 235.152,
    "s": 64.706,
    "l": 30
  },
  "oklch": {
    "l": 0.32129,
    "c": 0.15066,
    "h": 270.7
  },
  "luminance": 0.02941
}

Semantic roles & 50–950 ramp

primary

#1B237E

secondary

#B2A943

accent

#DA40E8

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B237E

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

Preview Lab → · Contrast checker → · Palette generator →