#1B237A#1B237A

#1B237A is a dark, vivid blue. Relative luminance 0.028; OKLCH L 31.7% C 0.145 H 270.9°. Best body text is #FFFFFF at 13.39:1 contrast (WCAG AA passes).

Color values

HEX	#1B237A
RGB	rgb(27, 35, 122)
HSL	hsl(235, 64%, 29%)
HSV	hsv(235, 78%, 48%)
CMYK	cmyk(77.9%, 71.3%, 0%, 52.2%)
CIE-LAB	lab(19.39, 29.20, -50.19)
CIE-LCH	lch(19.39, 58.06, 300.19°)
OKLab	oklab(31.7% 0.0023 -0.1452)
OKLCH	oklch(31.7% 0.145 270.9)
XYZ	xyz(4.5647, 2.8397, 18.7161)
Luminance	0.0284 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B237A #7A721B

analogous

#1B537A #1B237A #431B7A

triadic

#1B237A #7A1B23 #237A1B

tetradic

#1B237A #7A1B53 #7A721B #1B7A43

square

#1B237A #7A1B53 #7A721B #1B7A43

split-complementary

#1B237A #7A431B #537A1B

monochromatic

#060719 #101548 #1B237A #2631AC #3C48D4

Accessibility & contrast

On white

13.39

#1B237A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1B237A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B237A

13.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B237A	#FFFFFF	#000000	##FFFFFF
##1B237A	1.00	13.39	1.57	13.39
#FFFFFF	13.39	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00347D

Deuteranopia (green-blind)

#002A78

Tritanopia (blue-blind)

#003B4B

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1b237a;
/* rgb */ color: rgb(27, 35, 122);
/* oklch */ color: oklch(31.7% 0.145 270.9);

Tailwind

colors: {
  custom: {
    50: '#685ea1',
    500: '#1b237a',
    950: '#000000',
  },
}

SCSS

$custom: #1b237a;
$custom-light: #685ea1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b237a",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 122
  },
  "hsl": {
    "h": 234.947,
    "s": 63.758,
    "l": 29.216
  },
  "oklch": {
    "l": 0.31703,
    "c": 0.14524,
    "h": 270.9
  },
  "luminance": 0.0284
}

Semantic roles & 50–950 ramp

primary

#1B237A

secondary

#AEA543

accent

#D941E7

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B237A

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

Preview Lab → · Contrast checker → · Palette generator →