#51C5DF#51C5DF

#51C5DF is a light, moderate cyan. Relative luminance 0.470; OKLCH L 76.8% C 0.109 H 215.2°. Best body text is #000000 at 10.40:1 contrast (WCAG AA passes).

Color values

HEX	#51C5DF
RGB	rgb(81, 197, 223)
HSL	hsl(191, 69%, 60%)
HSV	hsv(191, 64%, 87%)
CMYK	cmyk(63.7%, 11.7%, 0%, 12.5%)
CIE-LAB	lab(74.19, -24.76, -22.63)
CIE-LCH	lch(74.19, 33.54, 222.43°)
OKLab	oklab(76.78% -0.0893 -0.0629)
OKLCH	oklch(76.78% 0.109 215.2)
XYZ	xyz(36.6734, 47.0056, 76.9380)
Luminance	0.4701 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51C5DF #DF6B51

analogous

#51DFB2 #51C5DF #517EDF

triadic

#51C5DF #DF51C5 #C5DF51

tetradic

#51C5DF #B251DF #DF6B51 #7EDF51

square

#51C5DF #B251DF #DF6B51 #7EDF51

split-complementary

#51C5DF #DF517E #DFB251

monochromatic

#1C8299 #26AECD #51C5DF #85D6E9 #B8E7F2

Accessibility & contrast

On white

2.02

#51C5DF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

10.40

#51C5DF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51C5DF

10.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51C5DF	#FFFFFF	#000000	##000000
##51C5DF	1.00	2.02	10.40	10.40
#FFFFFF	2.02	1.00	21.00	21.00
#000000	10.40	21.00	1.00	1.00
##000000	10.40	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#B3BFE0

Deuteranopia (green-blind)

#9EB0DF

Tritanopia (blue-blind)

#00CFCD

Achromatopsia (no color)

#B6B6B6

Design tokens & code

CSS

--color: #51c5df;
/* rgb */ color: rgb(81, 197, 223);
/* oklch */ color: oklch(76.8% 0.109 215.2);

Tailwind

colors: {
  custom: {
    50: '#91d6e9',
    500: '#51c5df',
    950: '#000000',
  },
}

SCSS

$custom: #51c5df;
$custom-light: #91d6e9;
$custom-dark: #000000;

JSON

{
  "hex": "#51c5df",
  "rgb": {
    "r": 81,
    "g": 197,
    "b": 223
  },
  "hsl": {
    "h": 190.986,
    "s": 68.932,
    "l": 59.608
  },
  "oklch": {
    "l": 0.76775,
    "c": 0.10926,
    "h": 215.2
  },
  "luminance": 0.4701
}

Semantic roles & 50–950 ramp

primary

#51C5DF

secondary

#E1B4AA

accent

#5C3CEC

background

#F9FDFE

surface

#F2FAFC

border

#CCD3D5

text

#0E1416

muted

#7E8384

Preview Lab

Preview with #51C5DF

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

Preview Lab → · Contrast checker → · Palette generator →