#1B128F#1B128F

#1B128F is a dark, vivid blue. Relative luminance 0.026; OKLCH L 31.8% C 0.187 H 271.3°. Best body text is #FFFFFF at 13.73:1 contrast (WCAG AA passes).

Color values

HEX	#1B128F
RGB	rgb(27, 18, 143)
HSL	hsl(244, 78%, 32%)
HSV	hsv(244, 87%, 56%)
CMYK	cmyk(81.1%, 87.4%, 0%, 43.9%)
CIE-LAB	lab(18.58, 45.81, -64.78)
CIE-LCH	lch(18.58, 79.34, 305.27°)
OKLab	oklab(31.85% 0.0043 -0.1874)
OKLCH	oklch(31.85% 0.187 271.3)
XYZ	xyz(5.6246, 2.6482, 26.1960)
Luminance	0.0265 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B128F #868F12

analogous

#12488F #1B128F #5A128F

triadic

#1B128F #8F1B12 #128F1B

tetradic

#1B128F #8F1248 #868F12 #128F5A

square

#1B128F #8F1248 #868F12 #128F5A

split-complementary

#1B128F #8F5A12 #488F12

monochromatic

#060422 #110B59 #1B128F #2519C5 #4236E6

Accessibility & contrast

On white

13.73

#1B128F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.53

#1B128F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B128F

13.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B128F	#FFFFFF	#000000	##FFFFFF
##1B128F	1.00	13.73	1.53	13.73
#FFFFFF	13.73	1.00	21.00	1.00
#000000	1.53	21.00	1.00	21.00
##FFFFFF	13.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003392

Deuteranopia (green-blind)

#00278D

Tritanopia (blue-blind)

#003C54

Achromatopsia (no color)

#2D2D2D

Design tokens & code

CSS

--color: #1b128f;
/* rgb */ color: rgb(27, 18, 143);
/* oklch */ color: oklch(31.8% 0.187 271.3);

Tailwind

colors: {
  custom: {
    50: '#7055b1',
    500: '#1b128f',
    950: '#000000',
  },
}

SCSS

$custom: #1b128f;
$custom-light: #7055b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b128f",
  "rgb": {
    "r": 27,
    "g": 18,
    "b": 143
  },
  "hsl": {
    "h": 244.32,
    "s": 77.64,
    "l": 31.569
  },
  "oklch": {
    "l": 0.31849,
    "c": 0.18742,
    "h": 271.3
  },
  "luminance": 0.02649
}

Semantic roles & 50–950 ramp

primary

#1B128F

secondary

#B9C33A

accent

#F434E6

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1B128F

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

Preview Lab → · Contrast checker → · Palette generator →