#1B277B#1B277B

#1B277B is a dark, vivid blue. Relative luminance 0.031; OKLCH L 32.5% C 0.142 H 269.9°. Best body text is #FFFFFF at 12.94:1 contrast (WCAG AA passes).

Color values

HEX	#1B277B
RGB	rgb(27, 39, 123)
HSL	hsl(233, 64%, 29%)
HSV	hsv(233, 78%, 48%)
CMYK	cmyk(78%, 68.3%, 0%, 51.8%)
CIE-LAB	lab(20.49, 26.89, -49.01)
CIE-LCH	lch(20.49, 55.90, 298.75°)
OKLab	oklab(32.54% -0.0002 -0.1418)
OKLCH	oklch(32.54% 0.142 269.9)
XYZ	xyz(4.7514, 3.1136, 19.0856)
Luminance	0.0311 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B277B #7B6F1B

analogous

#1B577B #1B277B #3F1B7B

triadic

#1B277B #7B1B27 #277B1B

tetradic

#1B277B #7B1B57 #7B6F1B #1B7B3F

square

#1B277B #7B1B57 #7B6F1B #1B7B3F

split-complementary

#1B277B #7B3F1B #577B1B

monochromatic

#060819 #101749 #1B277B #2637AD #3C4FD4

Accessibility & contrast

On white

12.94

#1B277B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.62

#1B277B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B277B

12.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B277B	#FFFFFF	#000000	##FFFFFF
##1B277B	1.00	12.94	1.62	12.94
#FFFFFF	12.94	1.00	21.00	1.00
#000000	1.62	21.00	1.00	21.00
##FFFFFF	12.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00367E

Deuteranopia (green-blind)

#002D79

Tritanopia (blue-blind)

#003D4D

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b277b;
/* rgb */ color: rgb(27, 39, 123);
/* oklch */ color: oklch(32.5% 0.142 269.9);

Tailwind

colors: {
  custom: {
    50: '#6861a2',
    500: '#1b277b',
    950: '#000000',
  },
}

SCSS

$custom: #1b277b;
$custom-light: #6861a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b277b",
  "rgb": {
    "r": 27,
    "g": 39,
    "b": 123
  },
  "hsl": {
    "h": 232.5,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.32536,
    "c": 0.14177,
    "h": 269.9
  },
  "luminance": 0.03114
}

Semantic roles & 50–950 ramp

primary

#1B277B

secondary

#AFA243

accent

#D241E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1B277B

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

Preview Lab → · Contrast checker → · Palette generator →