#51BFE9#51BFE9

#51BFE9 is a light, moderate cyan. Relative luminance 0.449; OKLCH L 75.8% C 0.116 H 226.7°. Best body text is #000000 at 9.98:1 contrast (WCAG AA passes).

Color values

HEX	#51BFE9
RGB	rgb(81, 191, 233)
HSL	hsl(197, 78%, 62%)
HSV	hsv(197, 65%, 91%)
CMYK	cmyk(65.2%, 18%, 0%, 8.6%)
CIE-LAB	lab(72.82, -18.66, -30.15)
CIE-LCH	lch(72.82, 35.46, 238.24°)
OKLab	oklab(75.79% -0.0795 -0.0843)
OKLCH	oklch(75.79% 0.116 226.7)
XYZ	xyz(36.7262, 44.8902, 83.8041)
Luminance	0.4489 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BFE9 #E97B51

analogous

#51E9C7 #51BFE9 #5173E9

triadic

#51BFE9 #E951BF #BFE951

tetradic

#51BFE9 #C751E9 #E97B51 #73E951

square

#51BFE9 #C751E9 #E97B51 #73E951

split-complementary

#51BFE9 #E95173 #E9C751

monochromatic

#1681AA #1CAAE0 #51BFE9 #87D3F0 #BEE7F7

Accessibility & contrast

On white

2.10

#51BFE9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.98

#51BFE9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BFE9

9.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BFE9	#FFFFFF	#000000	##000000
##51BFE9	1.00	2.10	9.98	9.98
#FFFFFF	2.10	1.00	21.00	21.00
#000000	9.98	21.00	1.00	1.00
##000000	9.98	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A8BCEB

Deuteranopia (green-blind)

#93ACE8

Tritanopia (blue-blind)

#00CBCD

Achromatopsia (no color)

#B3B3B3

Design tokens & code

CSS

--color: #51bfe9;
/* rgb */ color: rgb(81, 191, 233);
/* oklch */ color: oklch(75.8% 0.116 226.7);

Tailwind

colors: {
  custom: {
    50: '#91d2f0',
    500: '#51bfe9',
    950: '#000000',
  },
}

SCSS

$custom: #51bfe9;
$custom-light: #91d2f0;
$custom-dark: #000000;

JSON

{
  "hex": "#51bfe9",
  "rgb": {
    "r": 81,
    "g": 191,
    "b": 233
  },
  "hsl": {
    "h": 196.579,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.75794,
    "c": 0.11585,
    "h": 226.7
  },
  "luminance": 0.44894
}

Semantic roles & 50–950 ramp

primary

#51BFE9

secondary

#E7BEAF

accent

#450CDA

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BFE9

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

Preview Lab → · Contrast checker → · Palette generator →