#1B337F#1B337F

#1B337F is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.132 H 266.3°. Best body text is #FFFFFF at 11.50:1 contrast (WCAG AA passes).

Color values

HEX	#1B337F
RGB	rgb(27, 51, 127)
HSL	hsl(226, 65%, 30%)
HSV	hsv(226, 79%, 50%)
CMYK	cmyk(78.7%, 59.8%, 0%, 50.2%)
CIE-LAB	lab(24.10, 20.12, -45.64)
CIE-LCH	lch(24.10, 49.88, 293.79°)
OKLab	oklab(35.32% -0.0086 -0.1317)
OKLCH	oklch(35.32% 0.132 266.3)
XYZ	xyz(5.4652, 4.1324, 20.5841)
Luminance	0.0413 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B337F #7F671B

analogous

#1B657F #1B337F #351B7F

triadic

#1B337F #7F1B33 #337F1B

tetradic

#1B337F #7F1B65 #7F671B #1B7F35

square

#1B337F #7F1B65 #7F671B #1B7F35

split-complementary

#1B337F #7F351B #657F1B

monochromatic

#060A1A #101F4D #1B337F #2647B1 #3E63D6

Accessibility & contrast

On white

11.50

#1B337F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1B337F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B337F

11.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B337F	#FFFFFF	#000000	##FFFFFF
##1B337F	1.00	11.50	1.83	11.50
#FFFFFF	11.50	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E82

Deuteranopia (green-blind)

#00357E

Tritanopia (blue-blind)

#004653

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1b337f;
/* rgb */ color: rgb(27, 51, 127);
/* oklch */ color: oklch(35.3% 0.132 266.3);

Tailwind

colors: {
  custom: {
    50: '#686aa5',
    500: '#1b337f',
    950: '#000000',
  },
}

SCSS

$custom: #1b337f;
$custom-light: #686aa5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b337f",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 127
  },
  "hsl": {
    "h": 225.6,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.35322,
    "c": 0.13203,
    "h": 266.3
  },
  "luminance": 0.04133
}

Semantic roles & 50–950 ramp

primary

#1B337F

secondary

#B39843

accent

#C040E8

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B337F

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

Preview Lab → · Contrast checker → · Palette generator →