#288EEF#288EEF

#288EEF is a light, vivid cyan. Relative luminance 0.260; OKLCH L 63.9% C 0.171 H 251.8°. Best body text is #000000 at 6.21:1 contrast (WCAG AA passes).

Color values

HEX	#288EEF
RGB	rgb(40, 142, 239)
HSL	hsl(209, 86%, 55%)
HSV	hsv(209, 83%, 94%)
CMYK	cmyk(83.3%, 40.6%, 0%, 6.3%)
CIE-LAB	lab(58.06, 5.85, -56.67)
CIE-LCH	lch(58.06, 56.97, 275.89°)
OKLab	oklab(63.93% -0.0534 -0.1622)
OKLCH	oklch(63.93% 0.171 251.8)
XYZ	xyz(26.1221, 26.0258, 85.2913)
Luminance	0.2603 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#288EEF #EF8928

analogous

#28EFEC #288EEF #282BEF

triadic

#288EEF #EF288E #8EEF28

tetradic

#288EEF #EC28EF #EF8928 #2BEF28

square

#288EEF #EC28EF #EF8928 #2BEF28

split-complementary

#288EEF #EF282B #EFEC28

monochromatic

#0B5092 #0F6FCB #288EEF #61ACF3 #9ACAF7

Accessibility & contrast

On white

3.38

#288EEF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

6.21

#288EEF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #288EEF

6.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##288EEF	#FFFFFF	#000000	##000000
##288EEF	1.00	3.38	6.21	6.21
#FFFFFF	3.38	1.00	21.00	21.00
#000000	6.21	21.00	1.00	1.00
##000000	6.21	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E95F3

Deuteranopia (green-blind)

#3B83ED

Tritanopia (blue-blind)

#00A5B3

Achromatopsia (no color)

#8C8C8C

Design tokens & code

CSS

--color: #288eef;
/* rgb */ color: rgb(40, 142, 239);
/* oklch */ color: oklch(63.9% 0.171 251.8);

Tailwind

colors: {
  custom: {
    50: '#83aef5',
    500: '#288eef',
    950: '#000000',
  },
}

SCSS

$custom: #288eef;
$custom-light: #83aef5;
$custom-dark: #000000;

JSON

{
  "hex": "#288eef",
  "rgb": {
    "r": 40,
    "g": 142,
    "b": 239
  },
  "hsl": {
    "h": 209.246,
    "s": 86.147,
    "l": 54.706
  },
  "oklch": {
    "l": 0.63925,
    "c": 0.17079,
    "h": 251.8
  },
  "luminance": 0.26029
}

Semantic roles & 50–950 ramp

primary

#288EEF

secondary

#E3B88F

accent

#912BFC

background

#F9FAFF

surface

#F1F4FE

border

#CBCED6

text

#0D1017

muted

#7E7F85

Preview Lab

Preview with #288EEF

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

Preview Lab → · Contrast checker → · Palette generator →