#51BDDD#51BDDD

#51BDDD is a light, moderate cyan. Relative luminance 0.434; OKLCH L 74.8% C 0.108 H 220.6°. Best body text is #000000 at 9.67:1 contrast (WCAG AA passes).

Color values

HEX	#51BDDD
RGB	rgb(81, 189, 221)
HSL	hsl(194, 67%, 59%)
HSV	hsv(194, 63%, 87%)
CMYK	cmyk(63.3%, 14.5%, 0%, 13.3%)
CIE-LAB	lab(71.80, -21.31, -25.20)
CIE-LCH	lch(71.80, 33.00, 229.79°)
OKLab	oklab(74.83% -0.0819 -0.0702)
OKLCH	oklch(74.83% 0.108 220.6)
XYZ	xyz(34.6368, 43.3613, 74.9368)
Luminance	0.4336 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDDD #DD7151

analogous

#51DDB7 #51BDDD #5177DD

triadic

#51BDDD #DD51BD #BDDD51

tetradic

#51BDDD #B751DD #DD7151 #77DD51

square

#51BDDD #B751DD #DD7151 #77DD51

split-complementary

#51BDDD #DD5177 #DDB751

monochromatic

#1D7B96 #27A4C9 #51BDDD #84D0E7 #B7E4F1

Accessibility & contrast

On white

2.17

#51BDDD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.67

#51BDDD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDDD

9.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDDD	#FFFFFF	#000000	##000000
##51BDDD	1.00	2.17	9.67	9.67
#FFFFFF	2.17	1.00	21.00	21.00
#000000	9.67	21.00	1.00	1.00
##000000	9.67	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#AAB8DF

Deuteranopia (green-blind)

#96AADD

Tritanopia (blue-blind)

#00C7C7

Achromatopsia (no color)

#B0B0B0

Design tokens & code

CSS

--color: #51bddd;
/* rgb */ color: rgb(81, 189, 221);
/* oklch */ color: oklch(74.8% 0.108 220.6);

Tailwind

colors: {
  custom: {
    50: '#90d1e7',
    500: '#51bddd',
    950: '#000000',
  },
}

SCSS

$custom: #51bddd;
$custom-light: #90d1e7;
$custom-dark: #000000;

JSON

{
  "hex": "#51bddd",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 221
  },
  "hsl": {
    "h": 193.714,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.74832,
    "c": 0.10786,
    "h": 220.6
  },
  "luminance": 0.43365
}

Semantic roles & 50–950 ramp

primary

#51BDDD

secondary

#E0B6AA

accent

#653EEA

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDDD

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

Preview Lab → · Contrast checker → · Palette generator →