#1B5B83#1B5B83

#1B5B83 is a mid, moderate cyan. Relative luminance 0.094; OKLCH L 45.1% C 0.091 H 241.0°. Best body text is #FFFFFF at 7.32:1 contrast (WCAG AA passes).

Color values

HEX	#1B5B83
RGB	rgb(27, 91, 131)
HSL	hsl(203, 66%, 31%)
HSV	hsv(203, 79%, 51%)
CMYK	cmyk(79.4%, 30.5%, 0%, 48.6%)
CIE-LAB	lab(36.66, -5.24, -28.04)
CIE-LCH	lch(36.66, 28.53, 259.42°)
OKLab	oklab(45.12% -0.044 -0.0794)
OKLCH	oklch(45.12% 0.091 241)
XYZ	xyz(8.2882, 9.3529, 22.8368)
Luminance	0.0935 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5B83 #83431B

analogous

#1B8377 #1B5B83 #1B2783

triadic

#1B5B83 #831B5B #5B831B

tetradic

#1B5B83 #771B83 #83431B #27831B

square

#1B5B83 #771B83 #83431B #27831B

split-complementary

#1B5B83 #831B27 #83771B

monochromatic

#06151E #113850 #1B5B83 #257EB6 #419ED8

Accessibility & contrast

On white

7.32

#1B5B83 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.87

#1B5B83 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B5B83

7.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5B83	#FFFFFF	#000000	##FFFFFF
##1B5B83	1.00	7.32	2.87	7.32
#FFFFFF	7.32	1.00	21.00	1.00
#000000	2.87	21.00	1.00	21.00
##FFFFFF	7.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#485C85

Deuteranopia (green-blind)

#3A5282

Tritanopia (blue-blind)

#006569

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #1b5b83;
/* rgb */ color: rgb(27, 91, 131);
/* oklch */ color: oklch(45.1% 0.091 241.0);

Tailwind

colors: {
  custom: {
    50: '#6889a7',
    500: '#1b5b83',
    950: '#000000',
  },
}

SCSS

$custom: #1b5b83;
$custom-light: #6889a7;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5b83",
  "rgb": {
    "r": 27,
    "g": 91,
    "b": 131
  },
  "hsl": {
    "h": 203.077,
    "s": 65.823,
    "l": 30.98
  },
  "oklch": {
    "l": 0.45119,
    "c": 0.09078,
    "h": 241
  },
  "luminance": 0.09354
}

Semantic roles & 50–950 ramp

primary

#1B5B83

secondary

#B67043

accent

#803FE9

background

#F6F8FA

surface

#ECF0F4

border

#C7CBCE

text

#070B0F

muted

#7A7C7F

Preview Lab

Preview with #1B5B83

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

Preview Lab → · Contrast checker → · Palette generator →