#2178A4#2178A4

#2178A4 is a mid, moderate cyan. Relative luminance 0.164; OKLCH L 54.3% C 0.104 H 236.1°. Best body text is #FFFFFF at 4.90:1 contrast (WCAG AA passes).

Color values

HEX	#2178A4
RGB	rgb(33, 120, 164)
HSL	hsl(200, 66%, 39%)
HSV	hsv(200, 80%, 64%)
CMYK	cmyk(79.9%, 26.8%, 0%, 35.7%)
CIE-LAB	lab(47.54, -9.56, -30.70)
CIE-LCH	lch(47.54, 32.15, 252.71°)
OKLab	oklab(54.33% -0.0583 -0.0867)
OKLCH	oklch(54.33% 0.105 236.1)
XYZ	xyz(14.0418, 16.4349, 37.5469)
Luminance	0.1644 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2178A4 #A44D21

analogous

#21A48E #2178A4 #2136A4

triadic

#2178A4 #A42178 #78A421

tetradic

#2178A4 #8E21A4 #A44D21 #36A421

square

#2178A4 #8E21A4 #A44D21 #36A421

split-complementary

#2178A4 #A42136 #A48E21

monochromatic

#0C2D3E #175371 #2178A4 #2D9DD5 #60B4DF

Accessibility & contrast

On white

4.90

#2178A4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.29

#2178A4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2178A4

4.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2178A4	#FFFFFF	#000000	##FFFFFF
##2178A4	1.00	4.90	4.29	4.90
#FFFFFF	4.90	1.00	21.00	1.00
#000000	4.29	21.00	1.00	21.00
##FFFFFF	4.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#6378A6

Deuteranopia (green-blind)

#516BA3

Tritanopia (blue-blind)

#008387

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #2178a4;
/* rgb */ color: rgb(33, 120, 164);
/* oklch */ color: oklch(54.3% 0.104 236.1);

Tailwind

colors: {
  custom: {
    50: '#729ebf',
    500: '#2178a4',
    950: '#000000',
  },
}

SCSS

$custom: #2178a4;
$custom-light: #729ebf;
$custom-dark: #000000;

JSON

{
  "hex": "#2178a4",
  "rgb": {
    "r": 33,
    "g": 120,
    "b": 164
  },
  "hsl": {
    "h": 200.153,
    "s": 66.497,
    "l": 38.627
  },
  "oklch": {
    "l": 0.54329,
    "c": 0.1045,
    "h": 236.1
  },
  "luminance": 0.16437
}

Semantic roles & 50–950 ramp

primary

#2178A4

secondary

#C4805D

accent

#783EE9

background

#F7F9FB

surface

#EDF2F7

border

#C8CCD0

text

#090E12

muted

#7B7E81

Preview Lab

Preview with #2178A4

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

Preview Lab → · Contrast checker → · Palette generator →