#288FEF#288FEF

#288FEF is a light, vivid cyan. Relative luminance 0.263; OKLCH L 64.1% C 0.170 H 251.4°. Best body text is #000000 at 6.27:1 contrast (WCAG AA passes).

Color values

HEX	#288FEF
RGB	rgb(40, 143, 239)
HSL	hsl(209, 86%, 55%)
HSV	hsv(209, 83%, 94%)
CMYK	cmyk(83.3%, 40.2%, 0%, 6.3%)
CIE-LAB	lab(58.34, 5.25, -56.22)
CIE-LCH	lch(58.34, 56.47, 275.34°)
OKLab	oklab(64.15% -0.0542 -0.1609)
OKLCH	oklch(64.15% 0.17 251.4)
XYZ	xyz(26.2716, 26.3247, 85.3411)
Luminance	0.2633 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#288FEF #EF8828

analogous

#28EFEC #288FEF #282BEF

triadic

#288FEF #EF288F #8FEF28

tetradic

#288FEF #EC28EF #EF8828 #2BEF28

square

#288FEF #EC28EF #EF8828 #2BEF28

split-complementary

#288FEF #EF282B #EFEC28

monochromatic

#0B5192 #0F70CB #288FEF #61ADF3 #9ACAF7

Accessibility & contrast

On white

3.35

#288FEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.27

#288FEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #288FEF

6.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##288FEF	#FFFFFF	#000000	##000000
##288FEF	1.00	3.35	6.27	6.27
#FFFFFF	3.35	1.00	21.00	21.00
#000000	6.27	21.00	1.00	1.00
##000000	6.27	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5F96F3

Deuteranopia (green-blind)

#3E84ED

Tritanopia (blue-blind)

#00A6B3

Achromatopsia (no color)

#8C8C8C

Design tokens & code

CSS

--color: #288fef;
/* rgb */ color: rgb(40, 143, 239);
/* oklch */ color: oklch(64.1% 0.170 251.4);

Tailwind

colors: {
  custom: {
    50: '#83aff5',
    500: '#288fef',
    950: '#000000',
  },
}

SCSS

$custom: #288fef;
$custom-light: #83aff5;
$custom-dark: #000000;

JSON

{
  "hex": "#288fef",
  "rgb": {
    "r": 40,
    "g": 143,
    "b": 239
  },
  "hsl": {
    "h": 208.945,
    "s": 86.147,
    "l": 54.706
  },
  "oklch": {
    "l": 0.64145,
    "c": 0.16976,
    "h": 251.4
  },
  "luminance": 0.26328
}

Semantic roles & 50–950 ramp

primary

#288FEF

secondary

#E3B88F

accent

#902BFC

background

#F9FAFF

surface

#F1F4FE

border

#CBCED6

text

#0D1017

muted

#7E7F85

Preview Lab

Preview with #288FEF

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

Preview Lab → · Contrast checker → · Palette generator →