#1B557B#1B557B

#1B557B is a dark, moderate cyan. Relative luminance 0.082; OKLCH L 43.1% C 0.086 H 241.8°. Best body text is #FFFFFF at 7.98:1 contrast (WCAG AA passes).

Color values

HEX#1B557B
RGBrgb(27, 85, 123)
HSLhsl(204, 64%, 29%)
HSVhsv(204, 78%, 48%)
CMYKcmyk(78%, 30.9%, 0%, 51.8%)
CIE-LABlab(34.31, -4.58, -26.80)
CIE-LCHlch(34.31, 27.19, 260.31°)
OKLaboklab(43.13% -0.0406 -0.0759)
OKLCHoklch(43.13% 0.086 241.8)
XYZxyz(7.2743, 8.1592, 19.9266)
Luminance0.0816 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#1B557B #7B411B
analogous
#1B7B71 #1B557B #1B257B
triadic
#1B557B #7B1B55 #557B1B
tetradic
#1B557B #711B7B #7B411B #257B1B
square
#1B557B #711B7B #7B411B #257B1B
split-complementary
#1B557B #7B1B25 #7B711B
monochromatic
#061119 #103249 #1B557B #2678AD #3C98D4

Accessibility & contrast

On white

7.98
#1B557B on #FFFFFF
AA ✓AA large ✓AAA ✓

On black

2.63
#1B557B on #000000
AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B557B
7.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##1B557B#FFFFFF#000000##FFFFFF
##1B557B1.007.982.637.98
#FFFFFF7.981.0021.001.00
#0000002.6321.001.0021.00
##FFFFFF7.981.0021.001.00

Color blindness preview

Protanopia (red-blind)
#43567D
Deuteranopia (green-blind)
#364D7A
Tritanopia (blue-blind)
#005E62
Achromatopsia (no color)
#515151

Design tokens & code

CSS
--color: #1b557b;
/* rgb */ color: rgb(27, 85, 123);
/* oklch */ color: oklch(43.1% 0.086 241.8);
Tailwind
colors: {
  custom: {
    50: '#6684a1',
    500: '#1b557b',
    950: '#000000',
  },
}
SCSS
$custom: #1b557b;
$custom-light: #6684a1;
$custom-dark: #000000;
JSON
{
  "hex": "#1b557b",
  "rgb": {
    "r": 27,
    "g": 85,
    "b": 123
  },
  "hsl": {
    "h": 203.75,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.43129,
    "c": 0.08607,
    "h": 241.8
  },
  "luminance": 0.0816
}

Semantic roles & 50–950 ramp

primary
#1B557B
secondary
#AF6E43
accent
#8341E7
background
#F6F8F9
surface
#EBEFF2
border
#C6CACC
text
#070A0F
muted
#7A7C7E

Preview Lab

Preview with #1B557B

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

Preview Lab → · Contrast checker → · Palette generator →

#1B557B Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva