#4278D5#4278D5

#4278D5 is a mid, vivid blue. Relative luminance 0.194; OKLCH L 58.3% C 0.154 H 260.5°. Best body text is #000000 at 4.88:1 contrast (WCAG AA passes).

Color values

HEX	#4278D5
RGB	rgb(66, 120, 213)
HSL	hsl(218, 64%, 55%)
HSV	hsv(218, 69%, 84%)
CMYK	cmyk(69%, 43.7%, 0%, 16.5%)
CIE-LAB	lab(51.14, 12.71, -53.13)
CIE-LCH	lch(51.14, 54.63, 283.45°)
OKLab	oklab(58.28% -0.0254 -0.1519)
OKLCH	oklch(58.28% 0.154 260.5)
XYZ	xyz(20.9692, 19.3931, 65.5760)
Luminance	0.1940 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278D5 #D59F42

analogous

#42C2D5 #4278D5 #5642D5

triadic

#4278D5 #D54278 #78D542

tetradic

#4278D5 #D542C2 #D59F42 #42D556

square

#4278D5 #D542C2 #D59F42 #42D556

split-complementary

#4278D5 #D55642 #C2D542

monochromatic

#1C4180 #285BB2 #4278D5 #749CE0 #A6C0EB

Accessibility & contrast

On white

4.30

#4278D5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.88

#4278D5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278D5

4.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278D5	#FFFFFF	#000000	##000000
##4278D5	1.00	4.30	4.88	4.88
#FFFFFF	4.30	1.00	21.00	21.00
#000000	4.88	21.00	1.00	1.00
##000000	4.88	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B81D9

Deuteranopia (green-blind)

#3074D3

Tritanopia (blue-blind)

#008E9C

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #4278d5;
/* rgb */ color: rgb(66, 120, 213);
/* oklch */ color: oklch(58.3% 0.154 260.5);

Tailwind

colors: {
  custom: {
    50: '#879ee2',
    500: '#4278d5',
    950: '#000000',
  },
}

SCSS

$custom: #4278d5;
$custom-light: #879ee2;
$custom-dark: #000000;

JSON

{
  "hex": "#4278d5",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 213
  },
  "hsl": {
    "h": 217.959,
    "s": 63.636,
    "l": 54.706
  },
  "oklch": {
    "l": 0.58281,
    "c": 0.15403,
    "h": 260.5
  },
  "luminance": 0.19395
}

Semantic roles & 50–950 ramp

primary

#4278D5

secondary

#D8C29A

accent

#AA41E7

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0D0E15

muted

#7D7E83

Preview Lab

Preview with #4278D5

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

Preview Lab → · Contrast checker → · Palette generator →