#51A9E6#51A9E6

#51A9E6 is a light, vivid cyan. Relative luminance 0.358; OKLCH L 70.6% C 0.123 H 241.7°. Best body text is #000000 at 8.17:1 contrast (WCAG AA passes).

Color values

HEX	#51A9E6
RGB	rgb(81, 169, 230)
HSL	hsl(205, 75%, 61%)
HSV	hsv(205, 65%, 90%)
CMYK	cmyk(64.8%, 26.5%, 0%, 9.8%)
CIE-LAB	lab(66.39, -7.82, -38.48)
CIE-LCH	lch(66.39, 39.26, 258.51°)
OKLab	oklab(70.64% -0.0583 -0.1083)
OKLCH	oklch(70.64% 0.123 241.7)
XYZ	xyz(31.8588, 35.8352, 80.0855)
Luminance	0.3584 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51A9E6 #E68E51

analogous

#51E6D8 #51A9E6 #515EE6

triadic

#51A9E6 #E651A9 #A9E651

tetradic

#51A9E6 #D851E6 #E68E51 #5EE651

square

#51A9E6 #D851E6 #E68E51 #5EE651

split-complementary

#51A9E6 #E6515E #E6D851

monochromatic

#186BA5 #1F8EDA #51A9E6 #87C3EE #BCDEF5

Accessibility & contrast

On white

2.57

#51A9E6 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.17

#51A9E6 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A9E6

8.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51A9E6	#FFFFFF	#000000	##000000
##51A9E6	1.00	2.57	8.17	8.17
#FFFFFF	2.57	1.00	21.00	21.00
#000000	8.17	21.00	1.00	1.00
##000000	8.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#8DAAE9

Deuteranopia (green-blind)

#799BE5

Tritanopia (blue-blind)

#00B8BE

Achromatopsia (no color)

#A1A1A1

Design tokens & code

CSS

--color: #51a9e6;
/* rgb */ color: rgb(81, 169, 230);
/* oklch */ color: oklch(70.6% 0.123 241.7);

Tailwind

colors: {
  custom: {
    50: '#90c2ee',
    500: '#51a9e6',
    950: '#000000',
  },
}

SCSS

$custom: #51a9e6;
$custom-light: #90c2ee;
$custom-dark: #000000;

JSON

{
  "hex": "#51a9e6",
  "rgb": {
    "r": 81,
    "g": 169,
    "b": 230
  },
  "hsl": {
    "h": 204.564,
    "s": 74.874,
    "l": 60.98
  },
  "oklch": {
    "l": 0.70644,
    "c": 0.12304,
    "h": 241.7
  },
  "luminance": 0.35838
}

Semantic roles & 50–950 ramp

primary

#51A9E6

secondary

#E5C4AD

accent

#610ED7

background

#F9FBFE

surface

#F2F7FD

border

#CCD0D5

text

#0E1216

muted

#7E8184

Preview Lab

Preview with #51A9E6

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

Preview Lab → · Contrast checker → · Palette generator →