#1B397D#1B397D

#1B397D is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.5% C 0.121 H 263.6°. Best body text is #FFFFFF at 10.89:1 contrast (WCAG AA passes).

Color values

HEX	#1B397D
RGB	rgb(27, 57, 125)
HSL	hsl(222, 64%, 30%)
HSV	hsv(222, 78%, 49%)
CMYK	cmyk(78.4%, 54.4%, 0%, 51%)
CIE-LAB	lab(25.68, 15.08, -41.82)
CIE-LCH	lch(25.68, 44.46, 289.83°)
OKLab	oklab(36.46% -0.0135 -0.1204)
OKLCH	oklch(36.46% 0.121 263.6)
XYZ	xyz(5.6155, 4.6393, 19.9976)
Luminance	0.0464 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B397D #7D5F1B

analogous

#1B6A7D #1B397D #2E1B7D

triadic

#1B397D #7D1B39 #397D1B

tetradic

#1B397D #7D1B6A #7D5F1B #1B7D2E

square

#1B397D #7D1B6A #7D5F1B #1B7D2E

split-complementary

#1B397D #7D2E1B #6A7D1B

monochromatic

#050B19 #10224B #1B397D #2650AF #3D6CD5

Accessibility & contrast

On white

10.89

#1B397D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#1B397D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B397D

10.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B397D	#FFFFFF	#000000	##FFFFFF
##1B397D	1.00	10.89	1.93	10.89
#FFFFFF	10.89	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#09427F

Deuteranopia (green-blind)

#00397C

Tritanopia (blue-blind)

#004955

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b397d;
/* rgb */ color: rgb(27, 57, 125);
/* oklch */ color: oklch(36.5% 0.121 263.6);

Tailwind

colors: {
  custom: {
    50: '#676ea3',
    500: '#1b397d',
    950: '#000000',
  },
}

SCSS

$custom: #1b397d;
$custom-light: #676ea3;
$custom-dark: #000000;

JSON

{
  "hex": "#1b397d",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 125
  },
  "hsl": {
    "h": 221.633,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.36461,
    "c": 0.12117,
    "h": 263.6
  },
  "luminance": 0.0464
}

Semantic roles & 50–950 ramp

primary

#1B397D

secondary

#B18F43

accent

#B440E7

background

#F6F6FA

surface

#EBEBF4

border

#C6C6CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B397D

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

Preview Lab → · Contrast checker → · Palette generator →