#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
RGBrgb(27, 87, 127)
HSLhsl(204, 65%, 30%)
HSVhsv(204, 79%, 50%)
CMYKcmyk(78.7%, 31.5%, 0%, 50.2%)
CIE-LABlab(35.16, -4.29, -27.93)
CIE-LCHlch(35.16, 28.26, 261.28°)
OKLaboklab(43.87% -0.0413 -0.0791)
OKLCHoklch(43.87% 0.089 242.4)
XYZxyz(7.6895, 8.5808, 21.3256)
Luminance0.0858 (WCAG relative)
Temperaturecool
Familycyan

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
##1B577F1.007.732.727.73
#FFFFFF7.731.0021.001.00
#0000002.7221.001.0021.00
##FFFFFF7.731.0021.001.00

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 →

#1B577F Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva