#51A5E4#51A5E4

#51A5E4 is a light, vivid cyan. Relative luminance 0.343; OKLCH L 69.6% C 0.124 H 243.6°. Best body text is #000000 at 7.85:1 contrast (WCAG AA passes).

Color values

HEX	#51A5E4
RGB	rgb(81, 165, 228)
HSL	hsl(206, 73%, 61%)
HSV	hsv(206, 64%, 89%)
CMYK	cmyk(64.5%, 27.6%, 0%, 10.6%)
CIE-LAB	lab(65.17, -6.25, -39.29)
CIE-LCH	lch(65.17, 39.79, 260.96°)
OKLab	oklab(69.65% -0.0549 -0.1107)
OKLCH	oklch(69.65% 0.124 243.6)
XYZ	xyz(30.8468, 34.2579, 78.3705)
Luminance	0.3426 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51A5E4 #E49051

analogous

#51E4D9 #51A5E4 #515CE4

triadic

#51A5E4 #E451A5 #A5E451

tetradic

#51A5E4 #D951E4 #E49051 #5CE451

square

#51A5E4 #D951E4 #E49051 #5CE451

split-complementary

#51A5E4 #E4515C #E4D951

monochromatic

#1967A2 #2189D7 #51A5E4 #86C0EC #BBDCF4

Accessibility & contrast

On white

2.67

#51A5E4 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.85

#51A5E4 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A5E4

7.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51A5E4	#FFFFFF	#000000	##000000
##51A5E4	1.00	2.67	7.85	7.85
#FFFFFF	2.67	1.00	21.00	21.00
#000000	7.85	21.00	1.00	1.00
##000000	7.85	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#89A6E7

Deuteranopia (green-blind)

#7598E3

Tritanopia (blue-blind)

#00B4BB

Achromatopsia (no color)

#9E9E9E

Design tokens & code

CSS

--color: #51a5e4;
/* rgb */ color: rgb(81, 165, 228);
/* oklch */ color: oklch(69.6% 0.124 243.6);

Tailwind

colors: {
  custom: {
    50: '#90bfec',
    500: '#51a5e4',
    950: '#000000',
  },
}

SCSS

$custom: #51a5e4;
$custom-light: #90bfec;
$custom-dark: #000000;

JSON

{
  "hex": "#51a5e4",
  "rgb": {
    "r": 81,
    "g": 165,
    "b": 228
  },
  "hsl": {
    "h": 205.714,
    "s": 73.134,
    "l": 60.588
  },
  "oklch": {
    "l": 0.69645,
    "c": 0.1236,
    "h": 243.6
  },
  "luminance": 0.34261
}

Semantic roles & 50–950 ramp

primary

#51A5E4

secondary

#E4C4AC

accent

#6510D5

background

#F9FBFE

surface

#F2F7FD

border

#CCD0D5

text

#0E1216

muted

#7E8184

Preview Lab

Preview with #51A5E4

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

Preview Lab → · Contrast checker → · Palette generator →