#2166B0#2166B0

#2166B0 is a mid, vivid cyan. Relative luminance 0.130; OKLCH L 50.7% C 0.135 H 253.5°. Best body text is #FFFFFF at 5.85:1 contrast (WCAG AA passes).

Color values

HEX	#2166B0
RGB	rgb(33, 102, 176)
HSL	hsl(211, 68%, 41%)
HSV	hsv(211, 81%, 69%)
CMYK	cmyk(81.3%, 42%, 0%, 31%)
CIE-LAB	lab(42.70, 5.98, -45.38)
CIE-LCH	lch(42.70, 45.77, 277.51°)
OKLab	oklab(50.72% -0.0385 -0.1299)
OKLCH	oklch(50.72% 0.135 253.5)
XYZ	xyz(13.2121, 12.9591, 42.8709)
Luminance	0.1296 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2166B0 #B06B21

analogous

#21ADB0 #2166B0 #2321B0

triadic

#2166B0 #B02166 #66B021

tetradic

#2166B0 #B021AD #B06B21 #21B023

square

#2166B0 #B021AD #B06B21 #21B023

split-complementary

#2166B0 #B02321 #ADB021

monochromatic

#0E2A49 #17487C #2166B0 #3584D9 #69A4E3

Accessibility & contrast

On white

5.85

#2166B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.59

#2166B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2166B0

5.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2166B0	#FFFFFF	#000000	##FFFFFF
##2166B0	1.00	5.85	3.59	5.85
#FFFFFF	5.85	1.00	21.00	1.00
#000000	3.59	21.00	1.00	21.00
##FFFFFF	5.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#416CB3

Deuteranopia (green-blind)

#285FAF

Tritanopia (blue-blind)

#007882

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #2166b0;
/* rgb */ color: rgb(33, 102, 176);
/* oklch */ color: oklch(50.7% 0.135 253.5);

Tailwind

colors: {
  custom: {
    50: '#7491c8',
    500: '#2166b0',
    950: '#000000',
  },
}

SCSS

$custom: #2166b0;
$custom-light: #7491c8;
$custom-dark: #000000;

JSON

{
  "hex": "#2166b0",
  "rgb": {
    "r": 33,
    "g": 102,
    "b": 176
  },
  "hsl": {
    "h": 211.049,
    "s": 68.421,
    "l": 40.98
  },
  "oklch": {
    "l": 0.50725,
    "c": 0.13548,
    "h": 253.5
  },
  "luminance": 0.12961
}

Semantic roles & 50–950 ramp

primary

#2166B0

secondary

#C89864

accent

#973DEB

background

#F7F8FC

surface

#EEF0F8

border

#C9CBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #2166B0

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

Preview Lab → · Contrast checker → · Palette generator →