#1B3C79#1B3C79

#1B3C79 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.8% C 0.111 H 261.4°. Best body text is #FFFFFF at 10.67:1 contrast (WCAG AA passes).

Color values

HEX	#1B3C79
RGB	rgb(27, 60, 121)
HSL	hsl(219, 64%, 29%)
HSV	hsv(219, 78%, 47%)
CMYK	cmyk(77.7%, 50.4%, 0%, 52.5%)
CIE-LAB	lab(26.29, 11.33, -38.32)
CIE-LCH	lch(26.29, 39.96, 286.47°)
OKLab	oklab(36.83% -0.0167 -0.11)
OKLCH	oklch(36.83% 0.111 261.4)
XYZ	xyz(5.5178, 4.8446, 18.7297)
Luminance	0.0485 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3C79 #79581B

analogous

#1B6B79 #1B3C79 #291B79

triadic

#1B3C79 #791B3C #3C791B

tetradic

#1B3C79 #791B6B #79581B #1B7929

square

#1B3C79 #791B6B #79581B #1B7929

split-complementary

#1B3C79 #79291B #6B791B

monochromatic

#060C19 #102347 #1B3C79 #2655AB #3B71D3

Accessibility & contrast

On white

10.67

#1B3C79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B3C79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3C79

10.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3C79	#FFFFFF	#000000	##FFFFFF
##1B3C79	1.00	10.67	1.97	10.67
#FFFFFF	10.67	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A437B

Deuteranopia (green-blind)

#003A78

Tritanopia (blue-blind)

#004B54

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3c79;
/* rgb */ color: rgb(27, 60, 121);
/* oklch */ color: oklch(36.8% 0.111 261.4);

Tailwind

colors: {
  custom: {
    50: '#6671a0',
    500: '#1b3c79',
    950: '#000000',
  },
}

SCSS

$custom: #1b3c79;
$custom-light: #6671a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3c79",
  "rgb": {
    "r": 27,
    "g": 60,
    "b": 121
  },
  "hsl": {
    "h": 218.936,
    "s": 63.514,
    "l": 29.02
  },
  "oklch": {
    "l": 0.36829,
    "c": 0.11131,
    "h": 261.4
  },
  "luminance": 0.04845
}

Semantic roles & 50–950 ramp

primary

#1B3C79

secondary

#AD8843

accent

#AD41E7

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1B3C79

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

Preview Lab → · Contrast checker → · Palette generator →