#1B3E71#1B3E71

#1B3E71 is a dark, moderate blue. Relative luminance 0.049; OKLCH L 36.7% C 0.097 H 258.0°. Best body text is #FFFFFF at 10.64:1 contrast (WCAG AA passes).

Color values

HEX	#1B3E71
RGB	rgb(27, 62, 113)
HSL	hsl(216, 61%, 27%)
HSV	hsv(216, 76%, 44%)
CMYK	cmyk(76.1%, 45.1%, 0%, 55.7%)
CIE-LAB	lab(26.36, 6.66, -33.13)
CIE-LCH	lch(26.36, 33.80, 281.37°)
OKLab	oklab(36.71% -0.0201 -0.0948)
OKLCH	oklch(36.71% 0.097 258)
XYZ	xyz(5.1542, 4.8700, 16.2879)
Luminance	0.0487 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3E71 #714E1B

analogous

#1B6971 #1B3E71 #231B71

triadic

#1B3E71 #711B3E #3E711B

tetradic

#1B3E71 #711B69 #714E1B #1B7123

square

#1B3E71 #711B69 #714E1B #1B7123

split-complementary

#1B3E71 #71231B #69711B

monochromatic

#060E19 #0F2340 #1B3E71 #2759A2 #3775CF

Accessibility & contrast

On white

10.64

#1B3E71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1B3E71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3E71

10.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3E71	#FFFFFF	#000000	##FFFFFF
##1B3E71	1.00	10.64	1.97	10.64
#FFFFFF	10.64	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#254373

Deuteranopia (green-blind)

#163B70

Tritanopia (blue-blind)

#004A52

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3e71;
/* rgb */ color: rgb(27, 62, 113);
/* oklch */ color: oklch(36.7% 0.097 258.0);

Tailwind

colors: {
  custom: {
    50: '#64729a',
    500: '#1b3e71',
    950: '#000000',
  },
}

SCSS

$custom: #1b3e71;
$custom-light: #64729a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3e71",
  "rgb": {
    "r": 27,
    "g": 62,
    "b": 113
  },
  "hsl": {
    "h": 215.581,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.3671,
    "c": 0.09687,
    "h": 258
  },
  "luminance": 0.04871
}

Semantic roles & 50–950 ramp

primary

#1B3E71

secondary

#A67D42

accent

#A343E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #1B3E71

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

Preview Lab → · Contrast checker → · Palette generator →