#4289CB#4289CB

#4289CB is a mid, vivid cyan. Relative luminance 0.234; OKLCH L 61.5% C 0.123 H 249.0°. Best body text is #000000 at 5.67:1 contrast (WCAG AA passes).

Color values

HEX	#4289CB
RGB	rgb(66, 137, 203)
HSL	hsl(209, 57%, 53%)
HSV	hsv(209, 67%, 80%)
CMYK	cmyk(67.5%, 32.5%, 0%, 20.4%)
CIE-LAB	lab(55.44, -1.09, -40.65)
CIE-LCH	lch(55.44, 40.66, 268.47°)
OKLab	oklab(61.45% -0.0441 -0.1151)
OKLCH	oklch(61.45% 0.123 249)
XYZ	xyz(21.9679, 23.3591, 59.8393)
Luminance	0.2336 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4289CB #CB8442

analogous

#42CBC8 #4289CB #4245CB

triadic

#4289CB #CB4289 #89CB42

tetradic

#4289CB #C842CB #CB8442 #45CB42

square

#4289CB #C842CB #CB8442 #45CB42

split-complementary

#4289CB #CB4245 #CBC842

monochromatic

#204B73 #2D6AA3 #4289CB #72A7D8 #A2C5E5

Accessibility & contrast

On white

3.70

#4289CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.67

#4289CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4289CB

5.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4289CB	#FFFFFF	#000000	##000000
##4289CB	1.00	3.70	5.67	5.67
#FFFFFF	3.70	1.00	21.00	21.00
#000000	5.67	21.00	1.00	1.00
##000000	5.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6C8CCE

Deuteranopia (green-blind)

#597FCA

Tritanopia (blue-blind)

#0099A1

Achromatopsia (no color)

#858585

Design tokens & code

CSS

--color: #4289cb;
/* rgb */ color: rgb(66, 137, 203);
/* oklch */ color: oklch(61.5% 0.123 249.0);

Tailwind

colors: {
  custom: {
    50: '#85abdb',
    500: '#4289cb',
    950: '#000000',
  },
}

SCSS

$custom: #4289cb;
$custom-light: #85abdb;
$custom-dark: #000000;

JSON

{
  "hex": "#4289cb",
  "rgb": {
    "r": 66,
    "g": 137,
    "b": 203
  },
  "hsl": {
    "h": 208.905,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.61454,
    "c": 0.12329,
    "h": 249
  },
  "luminance": 0.23361
}

Semantic roles & 50–950 ramp

primary

#4289CB

secondary

#D2B397

accent

#9148E0

background

#F8FAFD

surface

#F0F4FB

border

#CBCED4

text

#0C1015

muted

#7D7F83

Preview Lab

Preview with #4289CB

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

Preview Lab → · Contrast checker → · Palette generator →