#1B577C#1B577C

#1B577C is a dark, moderate cyan. Relative luminance 0.085; OKLCH L 43.7% C 0.086 H 240.4°. Best body text is #FFFFFF at 7.77:1 contrast (WCAG AA passes).

Color values

HEX	#1B577C
RGB	rgb(27, 87, 124)
HSL	hsl(203, 64%, 30%)
HSV	hsv(203, 78%, 49%)
CMYK	cmyk(78.2%, 29.8%, 0%, 51.4%)
CIE-LAB	lab(35.01, -5.44, -26.33)
CIE-LCH	lch(35.01, 26.88, 258.31°)
OKLab	oklab(43.7% -0.0424 -0.0744)
OKLCH	oklch(43.7% 0.086 240.4)
XYZ	xyz(7.4969, 8.5038, 20.3112)
Luminance	0.0851 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B577C #7C401B

analogous

#1B7C71 #1B577C #1B267C

triadic

#1B577C #7C1B57 #577C1B

tetradic

#1B577C #711B7C #7C401B #267C1B

square

#1B577C #711B7C #7C401B #267C1B

split-complementary

#1B577C #7C1B26 #7C711B

monochromatic

#051219 #10344A #1B577C #267AAE #3D9BD5

Accessibility & contrast

On white

7.77

#1B577C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.70

#1B577C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B577C

7.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B577C	#FFFFFF	#000000	##FFFFFF
##1B577C	1.00	7.77	2.70	7.77
#FFFFFF	7.77	1.00	21.00	1.00
#000000	2.70	21.00	1.00	21.00
##FFFFFF	7.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#46577E

Deuteranopia (green-blind)

#384E7B

Tritanopia (blue-blind)

#006064

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #1b577c;
/* rgb */ color: rgb(27, 87, 124);
/* oklch */ color: oklch(43.7% 0.086 240.4);

Tailwind

colors: {
  custom: {
    50: '#6786a2',
    500: '#1b577c',
    950: '#000000',
  },
}

SCSS

$custom: #1b577c;
$custom-light: #6786a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b577c",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 124
  },
  "hsl": {
    "h": 202.887,
    "s": 64.238,
    "l": 29.608
  },
  "oklch": {
    "l": 0.43699,
    "c": 0.08566,
    "h": 240.4
  },
  "luminance": 0.08505
}

Semantic roles & 50–950 ramp

primary

#1B577C

secondary

#B06C43

accent

#8041E7

background

#F6F8FA

surface

#EBEFF3

border

#C6CACD

text

#070B0F

muted

#7A7C7F

Preview Lab

Preview with #1B577C

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

Preview Lab → · Contrast checker → · Palette generator →