#288BB1#288BB1

#288BB1 is a mid, moderate cyan. Relative luminance 0.221; OKLCH L 59.8% C 0.105 H 228.7°. Best body text is #000000 at 5.42:1 contrast (WCAG AA passes).

Color values

HEX	#288BB1
RGB	rgb(40, 139, 177)
HSL	hsl(197, 63%, 43%)
HSV	hsv(197, 77%, 69%)
CMYK	cmyk(77.4%, 21.5%, 0%, 30.6%)
CIE-LAB	lab(54.12, -14.90, -27.97)
CIE-LCH	lch(54.12, 31.69, 241.95°)
OKLab	oklab(59.81% -0.0691 -0.0786)
OKLCH	oklch(59.81% 0.105 228.7)
XYZ	xyz(18.0403, 22.0885, 44.8992)
Luminance	0.2209 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#288BB1 #B14E28

analogous

#28B192 #288BB1 #2847B1

triadic

#288BB1 #B1288B #8BB128

tetradic

#288BB1 #9228B1 #B14E28 #47B128

square

#288BB1 #9228B1 #B14E28 #47B128

split-complementary

#288BB1 #B12847 #B19228

monochromatic

#113D4D #1D647F #288BB1 #42ACD4 #74C2E0

Accessibility & contrast

On white

3.88

#288BB1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.42

#288BB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #288BB1

5.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##288BB1	#FFFFFF	#000000	##000000
##288BB1	1.00	3.88	5.42	5.42
#FFFFFF	3.88	1.00	21.00	21.00
#000000	5.42	21.00	1.00	1.00
##000000	5.42	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7789B3

Deuteranopia (green-blind)

#657CB0

Tritanopia (blue-blind)

#009698

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #288bb1;
/* rgb */ color: rgb(40, 139, 177);
/* oklch */ color: oklch(59.8% 0.105 228.7);

Tailwind

colors: {
  custom: {
    50: '#77adc8',
    500: '#288bb1',
    950: '#000000',
  },
}

SCSS

$custom: #288bb1;
$custom-light: #77adc8;
$custom-dark: #000000;

JSON

{
  "hex": "#288bb1",
  "rgb": {
    "r": 40,
    "g": 139,
    "b": 177
  },
  "hsl": {
    "h": 196.642,
    "s": 63.134,
    "l": 42.549
  },
  "oklch": {
    "l": 0.59812,
    "c": 0.10461,
    "h": 228.7
  },
  "luminance": 0.22091
}

Semantic roles & 50–950 ramp

primary

#288BB1

secondary

#C7876E

accent

#6F42E6

background

#F7FAFC

surface

#EEF4F8

border

#C9CED1

text

#0A1013

muted

#7C7F82

Preview Lab

Preview with #288BB1

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

Preview Lab → · Contrast checker → · Palette generator →