#1B255B#1B255B

#1B255B is a dark, moderate blue. Relative luminance 0.023; OKLCH L 29.1% C 0.097 H 271.2°. Best body text is #FFFFFF at 14.36:1 contrast (WCAG AA passes).

Color values

HEX	#1B255B
RGB	rgb(27, 37, 91)
HSL	hsl(231, 54%, 23%)
HSV	hsv(231, 70%, 36%)
CMYK	cmyk(70.3%, 59.3%, 0%, 64.3%)
CIE-LAB	lab(17.04, 15.61, -33.81)
CIE-LCH	lch(17.04, 37.24, 294.79°)
OKLab	oklab(29.08% 0.002 -0.0972)
OKLCH	oklch(29.08% 0.097 271.2)
XYZ	xyz(3.0013, 2.3112, 10.1834)
Luminance	0.0231 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B255B #5B511B

analogous

#1B455B #1B255B #311B5B

triadic

#1B255B #5B1B25 #255B1B

tetradic

#1B255B #5B1B45 #5B511B #1B5B31

square

#1B255B #5B1B45 #5B511B #1B5B31

split-complementary

#1B255B #5B311B #455B1B

monochromatic

#070A18 #0D122C #1B255B #29388A #374BB9

Accessibility & contrast

On white

14.36

#1B255B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.46

#1B255B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B255B

14.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B255B	#FFFFFF	#000000	##FFFFFF
##1B255B	1.00	14.36	1.46	14.36
#FFFFFF	14.36	1.00	21.00	1.00
#000000	1.46	21.00	1.00	21.00
##FFFFFF	14.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002D5D

Deuteranopia (green-blind)

#00275A

Tritanopia (blue-blind)

#00323C

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #1b255b;
/* rgb */ color: rgb(27, 37, 91);
/* oklch */ color: oklch(29.1% 0.097 271.2);

Tailwind

colors: {
  custom: {
    50: '#605f8a',
    500: '#1b255b',
    950: '#000000',
  },
}

SCSS

$custom: #1b255b;
$custom-light: #605f8a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b255b",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 91
  },
  "hsl": {
    "h": 230.625,
    "s": 54.237,
    "l": 23.137
  },
  "oklch": {
    "l": 0.29083,
    "c": 0.09722,
    "h": 271.2
  },
  "luminance": 0.02311
}

Semantic roles & 50–950 ramp

primary

#1B255B

secondary

#918441

accent

#C74ADE

background

#F5F5F8

surface

#EAE9F0

border

#C6C5CB

text

#05040C

muted

#79797D

Preview Lab

Preview with #1B255B

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

Preview Lab → · Contrast checker → · Palette generator →