#51B1DB#51B1DB

#51B1DB is a light, moderate cyan. Relative luminance 0.383; OKLCH L 72.0% C 0.108 H 229.6°. Best body text is #000000 at 8.66:1 contrast (WCAG AA passes).

Color values

HEX	#51B1DB
RGB	rgb(81, 177, 219)
HSL	hsl(198, 66%, 59%)
HSV	hsv(198, 63%, 86%)
CMYK	cmyk(63%, 19.2%, 0%, 14.1%)
CIE-LAB	lab(68.24, -15.66, -29.57)
CIE-LCH	lch(68.24, 33.46, 242.09°)
OKLab	oklab(71.97% -0.0702 -0.0827)
OKLCH	oklch(71.97% 0.108 229.6)
XYZ	xyz(31.8966, 38.3048, 72.7167)
Luminance	0.3831 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B1DB #DB7B51

analogous

#51DBC0 #51B1DB #516CDB

triadic

#51B1DB #DB51B1 #B1DB51

tetradic

#51B1DB #C051DB #DB7B51 #6CDB51

square

#51B1DB #C051DB #DB7B51 #6CDB51

split-complementary

#51B1DB #DB516C #DBC051

monochromatic

#1E7093 #2996C6 #51B1DB #84C8E5 #B6DEF0

Accessibility & contrast

On white

2.42

#51B1DB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.66

#51B1DB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B1DB

8.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B1DB	#FFFFFF	#000000	##000000
##51B1DB	1.00	2.42	8.66	8.66
#FFFFFF	2.42	1.00	21.00	21.00
#000000	8.66	21.00	1.00	1.00
##000000	8.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9CAEDD

Deuteranopia (green-blind)

#88A0DA

Tritanopia (blue-blind)

#00BDBF

Achromatopsia (no color)

#A6A6A6

Design tokens & code

CSS

--color: #51b1db;
/* rgb */ color: rgb(81, 177, 219);
/* oklch */ color: oklch(72.0% 0.108 229.6);

Tailwind

colors: {
  custom: {
    50: '#8fc8e6',
    500: '#51b1db',
    950: '#000000',
  },
}

SCSS

$custom: #51b1db;
$custom-light: #8fc8e6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b1db",
  "rgb": {
    "r": 81,
    "g": 177,
    "b": 219
  },
  "hsl": {
    "h": 198.261,
    "s": 65.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.71966,
    "c": 0.10847,
    "h": 229.6
  },
  "luminance": 0.38308
}

Semantic roles & 50–950 ramp

primary

#51B1DB

secondary

#DFB9A9

accent

#733FE9

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B1DB

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

Preview Lab → · Contrast checker → · Palette generator →