#51BBE7#51BBE7

#51BBE7 is a light, moderate cyan. Relative luminance 0.431; OKLCH L 74.8% C 0.115 H 228.7°. Best body text is #000000 at 9.61:1 contrast (WCAG AA passes).

Color values

HEX	#51BBE7
RGB	rgb(81, 187, 231)
HSL	hsl(198, 76%, 61%)
HSV	hsv(198, 65%, 91%)
CMYK	cmyk(64.9%, 19%, 0%, 9.4%)
CIE-LAB	lab(71.59, -17.20, -30.96)
CIE-LCH	lch(71.59, 35.41, 240.94°)
OKLab	oklab(74.79% -0.0762 -0.0866)
OKLCH	oklch(74.79% 0.115 228.7)
XYZ	xyz(35.5817, 43.0557, 82.0212)
Luminance	0.4306 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BBE7 #E77D51

analogous

#51E7C8 #51BBE7 #5170E7

triadic

#51BBE7 #E751BB #BBE751

tetradic

#51BBE7 #C851E7 #E77D51 #70E751

square

#51BBE7 #C851E7 #E77D51 #70E751

split-complementary

#51BBE7 #E75170 #E7C851

monochromatic

#177CA7 #1EA5DC #51BBE7 #87D0EE #BDE5F6

Accessibility & contrast

On white

2.18

#51BBE7 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.61

#51BBE7 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BBE7

9.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BBE7	#FFFFFF	#000000	##000000
##51BBE7	1.00	2.18	9.61	9.61
#FFFFFF	2.18	1.00	21.00	21.00
#000000	9.61	21.00	1.00	1.00
##000000	9.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A4B8E9

Deuteranopia (green-blind)

#8FA9E6

Tritanopia (blue-blind)

#00C7C9

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #51bbe7;
/* rgb */ color: rgb(81, 187, 231);
/* oklch */ color: oklch(74.8% 0.115 228.7);

Tailwind

colors: {
  custom: {
    50: '#91cfee',
    500: '#51bbe7',
    950: '#000000',
  },
}

SCSS

$custom: #51bbe7;
$custom-light: #91cfee;
$custom-dark: #000000;

JSON

{
  "hex": "#51bbe7",
  "rgb": {
    "r": 81,
    "g": 187,
    "b": 231
  },
  "hsl": {
    "h": 197.6,
    "s": 75.758,
    "l": 61.176
  },
  "oklch": {
    "l": 0.74789,
    "c": 0.11533,
    "h": 228.7
  },
  "luminance": 0.43059
}

Semantic roles & 50–950 ramp

primary

#51BBE7

secondary

#E6BEAE

accent

#490ED8

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51BBE7

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

Preview Lab → · Contrast checker → · Palette generator →