#1B3F71#1B3F71

#1B3F71 is a dark, moderate cyan. Relative luminance 0.050; OKLCH L 37.0% C 0.096 H 257.3°. Best body text is #FFFFFF at 10.52:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F71
RGB	rgb(27, 63, 113)
HSL	hsl(215, 61%, 27%)
HSV	hsv(215, 76%, 44%)
CMYK	cmyk(76.1%, 44.2%, 0%, 55.7%)
CIE-LAB	lab(26.68, 5.97, -32.63)
CIE-LCH	lch(26.68, 33.17, 280.37°)
OKLab	oklab(36.95% -0.0211 -0.0933)
OKLCH	oklch(36.95% 0.096 257.3)
XYZ	xyz(5.2090, 4.9797, 16.3062)
Luminance	0.0498 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F71 #714D1B

analogous

#1B6A71 #1B3F71 #221B71

triadic

#1B3F71 #711B3F #3F711B

tetradic

#1B3F71 #711B6A #714D1B #1B7122

square

#1B3F71 #711B6A #714D1B #1B7122

split-complementary

#1B3F71 #71221B #6A711B

monochromatic

#060E19 #0F2340 #1B3F71 #275BA2 #3777CF

Accessibility & contrast

On white

10.52

#1B3F71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B3F71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F71

10.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F71	#FFFFFF	#000000	##FFFFFF
##1B3F71	1.00	10.52	2.00	10.52
#FFFFFF	10.52	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#274373

Deuteranopia (green-blind)

#183B70

Tritanopia (blue-blind)

#004B52

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3f71;
/* rgb */ color: rgb(27, 63, 113);
/* oklch */ color: oklch(37.0% 0.096 257.3);

Tailwind

colors: {
  custom: {
    50: '#64739a',
    500: '#1b3f71',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f71;
$custom-light: #64739a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f71",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 113
  },
  "hsl": {
    "h": 214.884,
    "s": 61.429,
    "l": 27.451
  },
  "oklch": {
    "l": 0.36954,
    "c": 0.09561,
    "h": 257.3
  },
  "luminance": 0.0498
}

Semantic roles & 50–950 ramp

primary

#1B3F71

secondary

#A67C42

accent

#A143E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #1B3F71

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

Preview Lab → · Contrast checker → · Palette generator →