#1B177B#1B177B

#1B177B is a dark, vivid blue. Relative luminance 0.023; OKLCH L 29.9% C 0.159 H 272.9°. Best body text is #FFFFFF at 14.43:1 contrast (WCAG AA passes).

Color values

HEX	#1B177B
RGB	rgb(27, 23, 123)
HSL	hsl(242, 68%, 29%)
HSV	hsv(242, 81%, 48%)
CMYK	cmyk(78%, 81.3%, 0%, 51.8%)
CIE-LAB	lab(16.87, 36.92, -54.98)
CIE-LCH	lch(16.87, 66.23, 303.88°)
OKLab	oklab(29.94% 0.008 -0.1591)
OKLCH	oklch(29.94% 0.159 272.9)
XYZ	xyz(4.3323, 2.2754, 18.9459)
Luminance	0.0228 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B177B #777B17

analogous

#17457B #1B177B #4D177B

triadic

#1B177B #7B1B17 #177B1B

tetradic

#1B177B #7B1745 #777B17 #177B4D

square

#1B177B #7B1745 #777B17 #177B4D

split-complementary

#1B177B #7B4D17 #457B17

monochromatic

#06051A #100D47 #1B177B #2621AF #3A33D9

Accessibility & contrast

On white

14.43

#1B177B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.46

#1B177B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B177B

14.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B177B	#FFFFFF	#000000	##FFFFFF
##1B177B	1.00	14.43	1.46	14.43
#FFFFFF	14.43	1.00	21.00	1.00
#000000	1.46	21.00	1.00	21.00
##FFFFFF	14.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002E7E

Deuteranopia (green-blind)

#002579

Tritanopia (blue-blind)

#003649

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #1b177b;
/* rgb */ color: rgb(27, 23, 123);
/* oklch */ color: oklch(29.9% 0.159 272.9);

Tailwind

colors: {
  custom: {
    50: '#6a56a2',
    500: '#1b177b',
    950: '#000000',
  },
}

SCSS

$custom: #1b177b;
$custom-light: #6a56a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b177b",
  "rgb": {
    "r": 27,
    "g": 23,
    "b": 123
  },
  "hsl": {
    "h": 242.4,
    "s": 68.493,
    "l": 28.627
  },
  "oklch": {
    "l": 0.29942,
    "c": 0.1593,
    "h": 272.9
  },
  "luminance": 0.02276
}

Semantic roles & 50–950 ramp

primary

#1B177B

secondary

#ABB03E

accent

#EB3CE4

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#08030F

muted

#7A787F

Preview Lab

Preview with #1B177B

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

Preview Lab → · Contrast checker → · Palette generator →