#5181E4#5181E4

#5181E4 is a mid, vivid blue. Relative luminance 0.231; OKLCH L 61.8% C 0.159 H 263.1°. Best body text is #000000 at 5.61:1 contrast (WCAG AA passes).

Color values

HEX	#5181E4
RGB	rgb(81, 129, 228)
HSL	hsl(220, 73%, 61%)
HSV	hsv(220, 64%, 89%)
CMYK	cmyk(64.5%, 43.4%, 0%, 10.6%)
CIE-LAB	lab(55.12, 14.83, -55.18)
CIE-LCH	lch(55.12, 57.13, 285.04°)
OKLab	oklab(61.8% -0.0191 -0.1575)
OKLCH	oklch(61.8% 0.159 263.1)
XYZ	xyz(25.2423, 23.0489, 76.5024)
Luminance	0.2305 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5181E4 #E4B451

analogous

#51CAE4 #5181E4 #6A51E4

triadic

#5181E4 #E45181 #81E451

tetradic

#5181E4 #E451CA #E4B451 #51E46A

square

#5181E4 #E451CA #E4B451 #51E46A

split-complementary

#5181E4 #E46A51 #CAE451

monochromatic

#1946A2 #215CD7 #5181E4 #86A7EC #BBCEF4

Accessibility & contrast

On white

3.74

#5181E4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.61

#5181E4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #5181E4

5.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5181E4	#FFFFFF	#000000	##000000
##5181E4	1.00	3.74	5.61	5.61
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.61	21.00	1.00	1.00
##000000	5.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#528BE8

Deuteranopia (green-blind)

#3A7EE2

Tritanopia (blue-blind)

#0098A7

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #5181e4;
/* rgb */ color: rgb(81, 129, 228);
/* oklch */ color: oklch(61.8% 0.159 263.1);

Tailwind

colors: {
  custom: {
    50: '#90a5ed',
    500: '#5181e4',
    950: '#000000',
  },
}

SCSS

$custom: #5181e4;
$custom-light: #90a5ed;
$custom-dark: #000000;

JSON

{
  "hex": "#5181e4",
  "rgb": {
    "r": 81,
    "g": 129,
    "b": 228
  },
  "hsl": {
    "h": 220.408,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.61804,
    "c": 0.15869,
    "h": 263.1
  },
  "luminance": 0.23051
}

Semantic roles & 50–950 ramp

primary

#5181E4

secondary

#E4D2AC

accent

#9510D5

background

#F9FAFE

surface

#F2F4FD

border

#CCCED5

text

#0E0F16

muted

#7E7F84

Preview Lab

Preview with #5181E4

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

Preview Lab → · Contrast checker → · Palette generator →