#4278D9#4278D9

#4278D9 is a mid, vivid blue. Relative luminance 0.196; OKLCH L 58.5% C 0.159 H 261.1°. Best body text is #000000 at 4.92:1 contrast (WCAG AA passes).

Color values

HEX	#4278D9
RGB	rgb(66, 120, 217)
HSL	hsl(219, 67%, 55%)
HSV	hsv(219, 70%, 85%)
CMYK	cmyk(69.6%, 44.7%, 0%, 14.9%)
CIE-LAB	lab(51.38, 14.14, -55.02)
CIE-LCH	lch(51.38, 56.81, 284.41°)
OKLab	oklab(58.54% -0.0247 -0.1575)
OKLCH	oklch(58.54% 0.159 261.1)
XYZ	xyz(21.4831, 19.5987, 68.2829)
Luminance	0.1960 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4278D9 #D9A342

analogous

#42C3D9 #4278D9 #5742D9

triadic

#4278D9 #D94278 #78D942

tetradic

#4278D9 #D942C3 #D9A342 #42D957

square

#4278D9 #D942C3 #D9A342 #42D957

split-complementary

#4278D9 #D95742 #C3D942

monochromatic

#1B4186 #255AB9 #4278D9 #759CE3 #A8C1ED

Accessibility & contrast

On white

4.27

#4278D9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.92

#4278D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #4278D9

4.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4278D9	#FFFFFF	#000000	##000000
##4278D9	1.00	4.27	4.92	4.92
#FFFFFF	4.27	1.00	21.00	21.00
#000000	4.92	21.00	1.00	1.00
##000000	4.92	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4782DD

Deuteranopia (green-blind)

#2A74D7

Tritanopia (blue-blind)

#008F9E

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #4278d9;
/* rgb */ color: rgb(66, 120, 217);
/* oklch */ color: oklch(58.5% 0.159 261.1);

Tailwind

colors: {
  custom: {
    50: '#879ee5',
    500: '#4278d9',
    950: '#000000',
  },
}

SCSS

$custom: #4278d9;
$custom-light: #879ee5;
$custom-dark: #000000;

JSON

{
  "hex": "#4278d9",
  "rgb": {
    "r": 66,
    "g": 120,
    "b": 217
  },
  "hsl": {
    "h": 218.543,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.5854,
    "c": 0.15939,
    "h": 261.1
  },
  "luminance": 0.19601
}

Semantic roles & 50–950 ramp

primary

#4278D9

secondary

#DBC49C

accent

#AC3EE9

background

#F9F9FE

surface

#F1F2FC

border

#CBCCD5

text

#0D0E16

muted

#7E7E84

Preview Lab

Preview with #4278D9

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

Preview Lab → · Contrast checker → · Palette generator →