#1B3E79#1B3E79

#1B3E79 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.3% C 0.109 H 260.2°. Best body text is #FFFFFF at 10.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B3E79
RGB	rgb(27, 62, 121)
HSL	hsl(218, 64%, 29%)
HSV	hsv(218, 78%, 47%)
CMYK	cmyk(77.7%, 48.8%, 0%, 52.5%)
CIE-LAB	lab(26.90, 9.93, -37.34)
CIE-LCH	lch(26.90, 38.63, 284.90°)
OKLab	oklab(37.3% -0.0185 -0.1071)
OKLCH	oklch(37.3% 0.109 260.2)
XYZ	xyz(5.6246, 5.0581, 18.7653)
Luminance	0.0506 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3E79 #79561B

analogous

#1B6D79 #1B3E79 #271B79

triadic

#1B3E79 #791B3E #3E791B

tetradic

#1B3E79 #791B6D #79561B #1B7927

square

#1B3E79 #791B6D #79561B #1B7927

split-complementary

#1B3E79 #79271B #6D791B

monochromatic

#060D19 #102447 #1B3E79 #2658AB #3B74D3

Accessibility & contrast

On white

10.44

#1B3E79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1B3E79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3E79

10.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3E79	#FFFFFF	#000000	##FFFFFF
##1B3E79	1.00	10.44	2.01	10.44
#FFFFFF	10.44	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E447B

Deuteranopia (green-blind)

#063C78

Tritanopia (blue-blind)

#004C55

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b3e79;
/* rgb */ color: rgb(27, 62, 121);
/* oklch */ color: oklch(37.3% 0.109 260.2);

Tailwind

colors: {
  custom: {
    50: '#6672a0',
    500: '#1b3e79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3e79;
$custom-light: #6672a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3e79",
  "rgb": {
    "r": 27,
    "g": 62,
    "b": 121
  },
  "hsl": {
    "h": 217.66,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.37299,
    "c": 0.10871,
    "h": 260.2
  },
  "luminance": 0.05059
}

Semantic roles & 50–950 ramp

primary

#1B3E79

secondary

#AD8643

accent

#A941E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080F

muted

#7A7B7E

Preview Lab

Preview with #1B3E79

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

Preview Lab → · Contrast checker → · Palette generator →