#1B397F#1B397F

#1B397F is a dark, vivid blue. Relative luminance 0.047; OKLCH L 36.6% C 0.124 H 263.8°. Best body text is #FFFFFF at 10.83:1 contrast (WCAG AA passes).

Color values

HEX	#1B397F
RGB	rgb(27, 57, 127)
HSL	hsl(222, 65%, 30%)
HSV	hsv(222, 79%, 50%)
CMYK	cmyk(78.7%, 55.1%, 0%, 50.2%)
CIE-LAB	lab(25.84, 15.89, -42.83)
CIE-LCH	lch(25.84, 45.68, 290.36°)
OKLab	oklab(36.63% -0.0133 -0.1234)
OKLCH	oklch(36.63% 0.124 263.8)
XYZ	xyz(5.7445, 4.6909, 20.6772)
Luminance	0.0469 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B397F #7F611B

analogous

#1B6B7F #1B397F #2F1B7F

triadic

#1B397F #7F1B39 #397F1B

tetradic

#1B397F #7F1B6B #7F611B #1B7F2F

square

#1B397F #7F1B6B #7F611B #1B7F2F

split-complementary

#1B397F #7F2F1B #6B7F1B

monochromatic

#060C1A #10224D #1B397F #2650B1 #3E6CD6

Accessibility & contrast

On white

10.83

#1B397F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1B397F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B397F

10.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B397F	#FFFFFF	#000000	##FFFFFF
##1B397F	1.00	10.83	1.94	10.83
#FFFFFF	10.83	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#044281

Deuteranopia (green-blind)

#00397E

Tritanopia (blue-blind)

#004A56

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b397f;
/* rgb */ color: rgb(27, 57, 127);
/* oklch */ color: oklch(36.6% 0.124 263.8);

Tailwind

colors: {
  custom: {
    50: '#686ea5',
    500: '#1b397f',
    950: '#000000',
  },
}

SCSS

$custom: #1b397f;
$custom-light: #686ea5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b397f",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 127
  },
  "hsl": {
    "h": 222,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.36626,
    "c": 0.1241,
    "h": 263.8
  },
  "luminance": 0.04692
}

Semantic roles & 50–950 ramp

primary

#1B397F

secondary

#B39143

accent

#B640E8

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B397F

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

Preview Lab → · Contrast checker → · Palette generator →