#4288CB#4288CB

#4288CB is a mid, vivid cyan. Relative luminance 0.231; OKLCH L 61.2% C 0.124 H 249.7°. Best body text is #000000 at 5.62:1 contrast (WCAG AA passes).

Color values

HEX	#4288CB
RGB	rgb(66, 136, 203)
HSL	hsl(209, 57%, 53%)
HSV	hsv(209, 67%, 80%)
CMYK	cmyk(67.5%, 33%, 0%, 20.4%)
CIE-LAB	lab(55.15, -0.50, -41.11)
CIE-LCH	lch(55.15, 41.11, 269.31°)
OKLab	oklab(61.23% -0.0431 -0.1165)
OKLCH	oklch(61.23% 0.124 249.7)
XYZ	xyz(21.8264, 23.0761, 59.7922)
Luminance	0.2308 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4288CB #CB8542

analogous

#42CBC9 #4288CB #4244CB

triadic

#4288CB #CB4288 #88CB42

tetradic

#4288CB #C942CB #CB8542 #44CB42

square

#4288CB #C942CB #CB8542 #44CB42

split-complementary

#4288CB #CB4244 #CBC942

monochromatic

#204A73 #2D69A3 #4288CB #72A6D8 #A2C4E5

Accessibility & contrast

On white

3.74

#4288CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.62

#4288CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4288CB

5.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4288CB	#FFFFFF	#000000	##000000
##4288CB	1.00	3.74	5.62	5.62
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.62	21.00	1.00	1.00
##000000	5.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6A8BCE

Deuteranopia (green-blind)

#577ECA

Tritanopia (blue-blind)

#0098A0

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #4288cb;
/* rgb */ color: rgb(66, 136, 203);
/* oklch */ color: oklch(61.2% 0.124 249.7);

Tailwind

colors: {
  custom: {
    50: '#85aadb',
    500: '#4288cb',
    950: '#000000',
  },
}

SCSS

$custom: #4288cb;
$custom-light: #85aadb;
$custom-dark: #000000;

JSON

{
  "hex": "#4288cb",
  "rgb": {
    "r": 66,
    "g": 136,
    "b": 203
  },
  "hsl": {
    "h": 209.343,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.61227,
    "c": 0.12419,
    "h": 249.7
  },
  "luminance": 0.23078
}

Semantic roles & 50–950 ramp

primary

#4288CB

secondary

#D2B497

accent

#9248E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #4288CB

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

Preview Lab → · Contrast checker → · Palette generator →