#51B8DB#51B8DB

#51B8DB is a light, moderate cyan. Relative luminance 0.411; OKLCH L 73.6% C 0.107 H 223.6°. Best body text is #000000 at 9.23:1 contrast (WCAG AA passes).

Color values

HEX	#51B8DB
RGB	rgb(81, 184, 219)
HSL	hsl(195, 66%, 59%)
HSV	hsv(195, 63%, 86%)
CMYK	cmyk(63%, 16%, 0%, 14.1%)
CIE-LAB	lab(70.27, -19.34, -26.45)
CIE-LCH	lch(70.27, 32.76, 233.83°)
OKLab	oklab(73.59% -0.0775 -0.0737)
OKLCH	oklch(73.59% 0.107 223.6)
XYZ	xyz(33.3149, 41.1413, 73.1894)
Luminance	0.4114 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B8DB #DB7451

analogous

#51DBB9 #51B8DB #5173DB

triadic

#51B8DB #DB51B8 #B8DB51

tetradic

#51B8DB #B951DB #DB7451 #73DB51

square

#51B8DB #B951DB #DB7451 #73DB51

split-complementary

#51B8DB #DB5173 #DBB951

monochromatic

#1E7693 #299EC6 #51B8DB #84CDE5 #B6E1F0

Accessibility & contrast

On white

2.28

#51B8DB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.23

#51B8DB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B8DB

9.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B8DB	#FFFFFF	#000000	##000000
##51B8DB	1.00	2.28	9.23	9.23
#FFFFFF	2.28	1.00	21.00	21.00
#000000	9.23	21.00	1.00	1.00
##000000	9.23	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A4B4DD

Deuteranopia (green-blind)

#91A6DB

Tritanopia (blue-blind)

#00C3C3

Achromatopsia (no color)

#ACACAC

Design tokens & code

CSS

--color: #51b8db;
/* rgb */ color: rgb(81, 184, 219);
/* oklch */ color: oklch(73.6% 0.107 223.6);

Tailwind

colors: {
  custom: {
    50: '#8fcde6',
    500: '#51b8db',
    950: '#000000',
  },
}

SCSS

$custom: #51b8db;
$custom-light: #8fcde6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b8db",
  "rgb": {
    "r": 81,
    "g": 184,
    "b": 219
  },
  "hsl": {
    "h": 195.217,
    "s": 65.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.73587,
    "c": 0.10697,
    "h": 223.6
  },
  "luminance": 0.41145
}

Semantic roles & 50–950 ramp

primary

#51B8DB

secondary

#DFB7A9

accent

#6A3FE9

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B8DB

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

Preview Lab → · Contrast checker → · Palette generator →