#1B437F#1B437F

#1B437F is a dark, moderate blue. Relative luminance 0.058; OKLCH L 38.9% C 0.111 H 258.6°. Best body text is #FFFFFF at 9.74:1 contrast (WCAG AA passes).

Color values

HEX	#1B437F
RGB	rgb(27, 67, 127)
HSL	hsl(216, 65%, 30%)
HSV	hsv(216, 79%, 50%)
CMYK	cmyk(78.7%, 47.2%, 0%, 50.2%)
CIE-LAB	lab(28.85, 8.92, -37.97)
CIE-LCH	lch(28.85, 39.00, 283.22°)
OKLab	oklab(38.93% -0.022 -0.1089)
OKLCH	oklch(38.93% 0.111 258.6)
XYZ	xyz(6.2885, 5.7789, 20.8586)
Luminance	0.0578 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B437F #7F571B

analogous

#1B757F #1B437F #251B7F

triadic

#1B437F #7F1B43 #437F1B

tetradic

#1B437F #7F1B75 #7F571B #1B7F25

square

#1B437F #7F1B75 #7F571B #1B7F25

split-complementary

#1B437F #7F251B #757F1B

monochromatic

#060E1A #10284D #1B437F #265EB1 #3E7BD6

Accessibility & contrast

On white

9.74

#1B437F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1B437F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B437F

9.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B437F	#FFFFFF	#000000	##FFFFFF
##1B437F	1.00	9.74	2.16	9.74
#FFFFFF	9.74	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#244981

Deuteranopia (green-blind)

#0D407E

Tritanopia (blue-blind)

#00515A

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1b437f;
/* rgb */ color: rgb(27, 67, 127);
/* oklch */ color: oklch(38.9% 0.111 258.6);

Tailwind

colors: {
  custom: {
    50: '#6776a4',
    500: '#1b437f',
    950: '#000000',
  },
}

SCSS

$custom: #1b437f;
$custom-light: #6776a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b437f",
  "rgb": {
    "r": 27,
    "g": 67,
    "b": 127
  },
  "hsl": {
    "h": 216,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.38931,
    "c": 0.11107,
    "h": 258.6
  },
  "luminance": 0.0578
}

Semantic roles & 50–950 ramp

primary

#1B437F

secondary

#B38643

accent

#A540E8

background

#F6F7FA

surface

#EBEDF4

border

#C6C8CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1B437F

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

Preview Lab → · Contrast checker → · Palette generator →