#288BB4#288BB4

#288BB4 is a mid, moderate cyan. Relative luminance 0.222; OKLCH L 60.0% C 0.107 H 230.7°. Best body text is #000000 at 5.44:1 contrast (WCAG AA passes).

Color values

HEX	#288BB4
RGB	rgb(40, 139, 180)
HSL	hsl(198, 64%, 43%)
HSV	hsv(198, 78%, 71%)
CMYK	cmyk(77.8%, 22.8%, 0%, 29.4%)
CIE-LAB	lab(54.25, -13.85, -29.48)
CIE-LCH	lch(54.25, 32.58, 244.83°)
OKLab	oklab(59.96% -0.068 -0.083)
OKLCH	oklch(59.96% 0.107 230.7)
XYZ	xyz(18.3426, 22.2094, 46.4913)
Luminance	0.2221 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#288BB4 #B45128

analogous

#28B497 #288BB4 #2845B4

triadic

#288BB4 #B4288B #8BB428

tetradic

#288BB4 #9728B4 #B45128 #45B428

square

#288BB4 #9728B4 #B45128 #45B428

split-complementary

#288BB4 #B42845 #B49728

monochromatic

#123E50 #1D6482 #288BB4 #44ABD5 #76C1E1

Accessibility & contrast

On white

3.86

#288BB4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.44

#288BB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #288BB4

5.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##288BB4	#FFFFFF	#000000	##000000
##288BB4	1.00	3.86	5.44	5.44
#FFFFFF	3.86	1.00	21.00	21.00
#000000	5.44	21.00	1.00	1.00
##000000	5.44	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7689B6

Deuteranopia (green-blind)

#637CB3

Tritanopia (blue-blind)

#009699

Achromatopsia (no color)

#828282

Design tokens & code

CSS

--color: #288bb4;
/* rgb */ color: rgb(40, 139, 180);
/* oklch */ color: oklch(60.0% 0.107 230.7);

Tailwind

colors: {
  custom: {
    50: '#78acca',
    500: '#288bb4',
    950: '#000000',
  },
}

SCSS

$custom: #288bb4;
$custom-light: #78acca;
$custom-dark: #000000;

JSON

{
  "hex": "#288bb4",
  "rgb": {
    "r": 40,
    "g": 139,
    "b": 180
  },
  "hsl": {
    "h": 197.571,
    "s": 63.636,
    "l": 43.137
  },
  "oklch": {
    "l": 0.59956,
    "c": 0.10724,
    "h": 230.7
  },
  "luminance": 0.22212
}

Semantic roles & 50–950 ramp

primary

#288BB4

secondary

#C88A70

accent

#7241E7

background

#F7FAFC

surface

#EEF4F8

border

#C9CED1

text

#0A1013

muted

#7C7F82

Preview Lab

Preview with #288BB4

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

Preview Lab → · Contrast checker → · Palette generator →