#2178BD#2178BD

#2178BD is a mid, vivid cyan. Relative luminance 0.174; OKLCH L 55.7% C 0.133 H 247.7°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#2178BD
RGB	rgb(33, 120, 189)
HSL	hsl(207, 70%, 44%)
HSV	hsv(207, 83%, 74%)
CMYK	cmyk(82.5%, 36.5%, 0%, 25.9%)
CIE-LAB	lab(48.80, -0.22, -43.23)
CIE-LCH	lch(48.80, 43.23, 269.70°)
OKLab	oklab(55.73% -0.0506 -0.1232)
OKLCH	oklch(55.73% 0.133 247.7)
XYZ	xyz(16.5254, 17.4283, 50.6273)
Luminance	0.1743 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2178BD #BD6621

analogous

#21BDB4 #2178BD #212ABD

triadic

#2178BD #BD2178 #78BD21

tetradic

#2178BD #B421BD #BD6621 #2ABD21

square

#2178BD #B421BD #BD6621 #2ABD21

split-complementary

#2178BD #BD212A #BDB421

monochromatic

#0F3655 #185789 #2178BD #3E97DD #72B3E6

Accessibility & contrast

On white

4.68

#2178BD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.49

#2178BD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2178BD

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2178BD	#FFFFFF	#000000	##FFFFFF
##2178BD	1.00	4.68	4.49	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.49	21.00	1.00	21.00
##FFFFFF	4.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#577CC0

Deuteranopia (green-blind)

#406EBC

Tritanopia (blue-blind)

#008991

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #2178bd;
/* rgb */ color: rgb(33, 120, 189);
/* oklch */ color: oklch(55.7% 0.133 247.7);

Tailwind

colors: {
  custom: {
    50: '#779ed1',
    500: '#2178bd',
    950: '#000000',
  },
}

SCSS

$custom: #2178bd;
$custom-light: #779ed1;
$custom-dark: #000000;

JSON

{
  "hex": "#2178bd",
  "rgb": {
    "r": 33,
    "g": 120,
    "b": 189
  },
  "hsl": {
    "h": 206.538,
    "s": 70.27,
    "l": 43.529
  },
  "oklch": {
    "l": 0.55733,
    "c": 0.13323,
    "h": 247.7
  },
  "luminance": 0.1743
}

Semantic roles & 50–950 ramp

primary

#2178BD

secondary

#CD976D

accent

#8A3BED

background

#F7F9FC

surface

#EEF2F9

border

#C9CCD2

text

#0A0E14

muted

#7C7E82

Preview Lab

Preview with #2178BD

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

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