#51B4DD#51B4DD

#51B4DD is a light, moderate cyan. Relative luminance 0.396; OKLCH L 72.7% C 0.109 H 228.3°. Best body text is #000000 at 8.92:1 contrast (WCAG AA passes).

Color values

HEX	#51B4DD
RGB	rgb(81, 180, 221)
HSL	hsl(198, 67%, 59%)
HSV	hsv(198, 63%, 87%)
CMYK	cmyk(63.3%, 18.6%, 0%, 13.3%)
CIE-LAB	lab(69.19, -16.63, -29.21)
CIE-LCH	lch(69.19, 33.61, 240.35°)
OKLab	oklab(72.75% -0.0726 -0.0816)
OKLCH	oklch(72.75% 0.109 228.3)
XYZ	xyz(32.7606, 39.6089, 74.3114)
Luminance	0.3961 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4DD #DD7A51

analogous

#51DDC0 #51B4DD #516EDD

triadic

#51B4DD #DD51B4 #B4DD51

tetradic

#51B4DD #C051DD #DD7A51 #6EDD51

square

#51B4DD #C051DD #DD7A51 #6EDD51

split-complementary

#51B4DD #DD516E #DDC051

monochromatic

#1D7396 #279AC9 #51B4DD #84CAE7 #B7E0F1

Accessibility & contrast

On white

2.35

#51B4DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.92

#51B4DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4DD

8.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4DD	#FFFFFF	#000000	##000000
##51B4DD	1.00	2.35	8.92	8.92
#FFFFFF	2.35	1.00	21.00	21.00
#000000	8.92	21.00	1.00	1.00
##000000	8.92	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9FB1DF

Deuteranopia (green-blind)

#8BA3DC

Tritanopia (blue-blind)

#00C0C1

Achromatopsia (no color)

#A9A9A9

Design tokens & code

CSS

--color: #51b4dd;
/* rgb */ color: rgb(81, 180, 221);
/* oklch */ color: oklch(72.7% 0.109 228.3);

Tailwind

colors: {
  custom: {
    50: '#8fcae7',
    500: '#51b4dd',
    950: '#000000',
  },
}

SCSS

$custom: #51b4dd;
$custom-light: #8fcae7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4dd",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 221
  },
  "hsl": {
    "h": 197.571,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.72745,
    "c": 0.10925,
    "h": 228.3
  },
  "luminance": 0.39612
}

Semantic roles & 50–950 ramp

primary

#51B4DD

secondary

#E0BAAA

accent

#703EEA

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4DD

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

Preview Lab → · Contrast checker → · Palette generator →