#1C66B3#1C66B3

#1C66B3 is a mid, vivid cyan. Relative luminance 0.130; OKLCH L 50.8% C 0.141 H 253.4°. Best body text is #FFFFFF at 5.83:1 contrast (WCAG AA passes).

Color values

HEX	#1C66B3
RGB	rgb(28, 102, 179)
HSL	hsl(211, 73%, 41%)
HSV	hsv(211, 84%, 70%)
CMYK	cmyk(84.4%, 43%, 0%, 29.8%)
CIE-LAB	lab(42.77, 6.69, -47.04)
CIE-LCH	lch(42.77, 47.51, 278.10°)
OKLab	oklab(50.8% -0.0402 -0.1348)
OKLCH	oklch(50.8% 0.141 253.4)
XYZ	xyz(13.3639, 13.0026, 44.4445)
Luminance	0.1300 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1C66B3 #B3691C

analogous

#1CB1B3 #1C66B3 #1D1CB3

triadic

#1C66B3 #B31C66 #66B31C

tetradic

#1C66B3 #B31CB1 #B3691C #1CB31D

square

#1C66B3 #B31CB1 #B3691C #1CB31D

split-complementary

#1C66B3 #B31D1C #B1B31C

monochromatic

#0B2A49 #14487E #1C66B3 #2E84DE #63A3E7

Accessibility & contrast

On white

5.83

#1C66B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.60

#1C66B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1C66B3

5.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1C66B3	#FFFFFF	#000000	##FFFFFF
##1C66B3	1.00	5.83	3.60	5.83
#FFFFFF	5.83	1.00	21.00	1.00
#000000	3.60	21.00	1.00	21.00
##FFFFFF	5.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F6CB6

Deuteranopia (green-blind)

#225FB1

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #1c66b3;
/* rgb */ color: rgb(28, 102, 179);
/* oklch */ color: oklch(50.8% 0.141 253.4);

Tailwind

colors: {
  custom: {
    50: '#7391ca',
    500: '#1c66b3',
    950: '#000000',
  },
}

SCSS

$custom: #1c66b3;
$custom-light: #7391ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1c66b3",
  "rgb": {
    "r": 28,
    "g": 102,
    "b": 179
  },
  "hsl": {
    "h": 210.596,
    "s": 72.947,
    "l": 40.588
  },
  "oklch": {
    "l": 0.50802,
    "c": 0.14068,
    "h": 253.4
  },
  "luminance": 0.13004
}

Semantic roles & 50–950 ramp

primary

#1C66B3

secondary

#CB965F

accent

#9638F0

background

#F7F8FC

surface

#EEF0F8

border

#C9CBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #1C66B3

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

Preview Lab → · Contrast checker → · Palette generator →