#1B588B#1B588B

#1B588B is a dark, moderate cyan. Relative luminance 0.091; OKLCH L 44.8% C 0.104 H 248.1°. Best body text is #FFFFFF at 7.46:1 contrast (WCAG AA passes).

Color values

HEX	#1B588B
RGB	rgb(27, 88, 139)
HSL	hsl(207, 67%, 33%)
HSV	hsv(207, 81%, 55%)
CMYK	cmyk(80.6%, 36.7%, 0%, 45.5%)
CIE-LAB	lab(36.13, -0.23, -33.75)
CIE-LCH	lch(36.13, 33.75, 269.62°)
OKLab	oklab(44.84% -0.0386 -0.0961)
OKLCH	oklch(44.84% 0.104 248.1)
XYZ	xyz(8.6001, 9.0755, 25.7196)
Luminance	0.0908 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B588B #8B4E1B

analogous

#1B8B86 #1B588B #1B208B

triadic

#1B588B #8B1B58 #588B1B

tetradic

#1B588B #861B8B #8B4E1B #208B1B

square

#1B588B #861B8B #8B4E1B #208B1B

split-complementary

#1B588B #8B1B20 #8B861B

monochromatic

#071725 #113858 #1B588B #2578BE #4597DB

Accessibility & contrast

On white

7.46

#1B588B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.82

#1B588B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B588B

7.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B588B	#FFFFFF	#000000	##FFFFFF
##1B588B	1.00	7.46	2.82	7.46
#FFFFFF	7.46	1.00	21.00	1.00
#000000	2.82	21.00	1.00	21.00
##FFFFFF	7.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#405B8D

Deuteranopia (green-blind)

#30508A

Tritanopia (blue-blind)

#00646B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1b588b;
/* rgb */ color: rgb(27, 88, 139);
/* oklch */ color: oklch(44.8% 0.104 248.1);

Tailwind

colors: {
  custom: {
    50: '#6a86ad',
    500: '#1b588b',
    950: '#000000',
  },
}

SCSS

$custom: #1b588b;
$custom-light: #6a86ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b588b",
  "rgb": {
    "r": 27,
    "g": 88,
    "b": 139
  },
  "hsl": {
    "h": 207.321,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.44843,
    "c": 0.10356,
    "h": 248.1
  },
  "luminance": 0.09077
}

Semantic roles & 50–950 ramp

primary

#1B588B

secondary

#BC7C45

accent

#8C3DEA

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#070B10

muted

#7A7C7F

Preview Lab

Preview with #1B588B

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

Preview Lab → · Contrast checker → · Palette generator →