#1B437B#1B437B

#1B437B is a dark, moderate blue. Relative luminance 0.057; OKLCH L 38.6% C 0.105 H 257.5°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B437B
RGB	rgb(27, 67, 123)
HSL	hsl(215, 64%, 29%)
HSV	hsv(215, 78%, 48%)
CMYK	cmyk(78%, 45.5%, 0%, 51.8%)
CIE-LAB	lab(28.58, 7.29, -35.89)
CIE-LCH	lch(28.58, 36.63, 281.48°)
OKLab	oklab(38.64% -0.0228 -0.1028)
OKLCH	oklch(38.64% 0.105 257.5)
XYZ	xyz(6.0330, 5.6767, 19.5128)
Luminance	0.0568 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B437B #7B531B

analogous

#1B737B #1B437B #231B7B

triadic

#1B437B #7B1B43 #437B1B

tetradic

#1B437B #7B1B73 #7B531B #1B7B23

square

#1B437B #7B1B73 #7B531B #1B7B23

split-complementary

#1B437B #7B231B #737B1B

monochromatic

#060E19 #102849 #1B437B #265EAD #3C7CD4

Accessibility & contrast

On white

9.83

#1B437B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1B437B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B437B

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B437B	#FFFFFF	#000000	##FFFFFF
##1B437B	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#27487D

Deuteranopia (green-blind)

#143F7A

Tritanopia (blue-blind)

#005059

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b437b;
/* rgb */ color: rgb(27, 67, 123);
/* oklch */ color: oklch(38.6% 0.105 257.5);

Tailwind

colors: {
  custom: {
    50: '#6676a1',
    500: '#1b437b',
    950: '#000000',
  },
}

SCSS

$custom: #1b437b;
$custom-light: #6676a1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b437b",
  "rgb": {
    "r": 27,
    "g": 67,
    "b": 123
  },
  "hsl": {
    "h": 215,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.3864,
    "c": 0.10527,
    "h": 257.5
  },
  "luminance": 0.05677
}

Semantic roles & 50–950 ramp

primary

#1B437B

secondary

#AF8243

accent

#A241E7

background

#F6F7FA

surface

#EBEDF3

border

#C6C8CD

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B437B

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

Preview Lab → · Contrast checker → · Palette generator →