#2166B3#2166B3

#2166B3 is a mid, vivid cyan. Relative luminance 0.131; OKLCH L 50.9% C 0.139 H 254.2°. Best body text is #FFFFFF at 5.81:1 contrast (WCAG AA passes).

Color values

HEX	#2166B3
RGB	rgb(33, 102, 179)
HSL	hsl(212, 69%, 42%)
HSV	hsv(212, 82%, 70%)
CMYK	cmyk(81.6%, 43%, 0%, 29.8%)
CIE-LAB	lab(42.88, 7.15, -46.85)
CIE-LCH	lch(42.88, 47.39, 278.68°)
OKLab	oklab(50.92% -0.0379 -0.1342)
OKLCH	oklch(50.92% 0.139 254.2)
XYZ	xyz(13.5122, 13.0791, 44.4514)
Luminance	0.1308 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2166B3 #B36E21

analogous

#21AFB3 #2166B3 #2521B3

triadic

#2166B3 #B32166 #66B321

tetradic

#2166B3 #B321AF #B36E21 #21B325

square

#2166B3 #B321AF #B36E21 #21B325

split-complementary

#2166B3 #B32521 #AFB321

monochromatic

#0E2B4C #17497F #2166B3 #3784DA #6BA4E4

Accessibility & contrast

On white

5.81

#2166B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.62

#2166B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2166B3

5.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2166B3	#FFFFFF	#000000	##FFFFFF
##2166B3	1.00	5.81	3.62	5.81
#FFFFFF	5.81	1.00	21.00	1.00
#000000	3.62	21.00	1.00	21.00
##FFFFFF	5.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F6CB6

Deuteranopia (green-blind)

#235FB1

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #2166b3;
/* rgb */ color: rgb(33, 102, 179);
/* oklch */ color: oklch(50.9% 0.139 254.2);

Tailwind

colors: {
  custom: {
    50: '#7491ca',
    500: '#2166b3',
    950: '#000000',
  },
}

SCSS

$custom: #2166b3;
$custom-light: #7491ca;
$custom-dark: #000000;

JSON

{
  "hex": "#2166b3",
  "rgb": {
    "r": 33,
    "g": 102,
    "b": 179
  },
  "hsl": {
    "h": 211.644,
    "s": 68.868,
    "l": 41.569
  },
  "oklch": {
    "l": 0.50924,
    "c": 0.13944,
    "h": 254.2
  },
  "luminance": 0.13081
}

Semantic roles & 50–950 ramp

primary

#2166B3

secondary

#CA9B66

accent

#993CEC

background

#F7F8FC

surface

#EEF0F8

border

#C9CBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #2166B3

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

Preview Lab → · Contrast checker → · Palette generator →