#1B577F#1B577F

#1B577F is a dark, moderate cyan. Relative luminance 0.086; OKLCH L 43.9% C 0.089 H 242.4°. Best body text is #FFFFFF at 7.73:1 contrast (WCAG AA passes).

Color values

HEX	#1B577F
RGB	rgb(27, 87, 127)
HSL	hsl(204, 65%, 30%)
HSV	hsv(204, 79%, 50%)
CMYK	cmyk(78.7%, 31.5%, 0%, 50.2%)
CIE-LAB	lab(35.16, -4.29, -27.93)
CIE-LCH	lch(35.16, 28.26, 261.28°)
OKLab	oklab(43.87% -0.0413 -0.0791)
OKLCH	oklch(43.87% 0.089 242.4)
XYZ	xyz(7.6895, 8.5808, 21.3256)
Luminance	0.0858 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B577F #7F431B

analogous

#1B7F75 #1B577F #1B257F

triadic

#1B577F #7F1B57 #577F1B

tetradic

#1B577F #751B7F #7F431B #257F1B

square

#1B577F #751B7F #7F431B #257F1B

split-complementary

#1B577F #7F1B25 #7F751B

monochromatic

#06121A #10344D #1B577F #267AB1 #3E99D6

Accessibility & contrast

On white

7.73

#1B577F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.72

#1B577F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B577F

7.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B577F	#FFFFFF	#000000	##FFFFFF
##1B577F	1.00	7.73	2.72	7.73
#FFFFFF	7.73	1.00	21.00	1.00
#000000	2.72	21.00	1.00	21.00
##FFFFFF	7.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#445881

Deuteranopia (green-blind)

#374F7E

Tritanopia (blue-blind)

#006165

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #1b577f;
/* rgb */ color: rgb(27, 87, 127);
/* oklch */ color: oklch(43.9% 0.089 242.4);

Tailwind

colors: {
  custom: {
    50: '#6786a4',
    500: '#1b577f',
    950: '#000000',
  },
}

SCSS

$custom: #1b577f;
$custom-light: #6786a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b577f",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 127
  },
  "hsl": {
    "h": 204,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.43871,
    "c": 0.08927,
    "h": 242.4
  },
  "luminance": 0.08582
}

Semantic roles & 50–950 ramp

primary

#1B577F

secondary

#B37043

accent

#8340E8

background

#F6F8FA

surface

#EBEFF4

border

#C6CACE

text

#070B0F

muted

#7A7C7F

Preview Lab

Preview with #1B577F

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

Preview Lab → · Contrast checker → · Palette generator →