#51B9DB#51B9DB

#51B9DB is a light, moderate cyan. Relative luminance 0.416; OKLCH L 73.8% C 0.107 H 222.7°. Best body text is #000000 at 9.31:1 contrast (WCAG AA passes).

Color values

HEX	#51B9DB
RGB	rgb(81, 185, 219)
HSL	hsl(195, 66%, 59%)
HSV	hsv(195, 63%, 86%)
CMYK	cmyk(63%, 15.5%, 0%, 14.1%)
CIE-LAB	lab(70.57, -19.86, -26.00)
CIE-LCH	lch(70.57, 32.72, 232.63°)
OKLab	oklab(73.82% -0.0785 -0.0725)
OKLCH	oklch(73.82% 0.107 222.7)
XYZ	xyz(33.5234, 41.5582, 73.2589)
Luminance	0.4156 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B9DB #DB7351

analogous

#51DBB8 #51B9DB #5174DB

triadic

#51B9DB #DB51B9 #B9DB51

tetradic

#51B9DB #B851DB #DB7351 #74DB51

square

#51B9DB #B851DB #DB7351 #74DB51

split-complementary

#51B9DB #DB5174 #DBB851

monochromatic

#1E7693 #299FC6 #51B9DB #84CDE5 #B6E2F0

Accessibility & contrast

On white

2.26

#51B9DB on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.31

#51B9DB on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B9DB

9.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B9DB	#FFFFFF	#000000	##000000
##51B9DB	1.00	2.26	9.31	9.31
#FFFFFF	2.26	1.00	21.00	21.00
#000000	9.31	21.00	1.00	1.00
##000000	9.31	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A5B5DD

Deuteranopia (green-blind)

#92A6DB

Tritanopia (blue-blind)

#00C4C4

Achromatopsia (no color)

#ADADAD

Design tokens & code

CSS

--color: #51b9db;
/* rgb */ color: rgb(81, 185, 219);
/* oklch */ color: oklch(73.8% 0.107 222.7);

Tailwind

colors: {
  custom: {
    50: '#8fcee6',
    500: '#51b9db',
    950: '#000000',
  },
}

SCSS

$custom: #51b9db;
$custom-light: #8fcee6;
$custom-dark: #000000;

JSON

{
  "hex": "#51b9db",
  "rgb": {
    "r": 81,
    "g": 185,
    "b": 219
  },
  "hsl": {
    "h": 194.783,
    "s": 65.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.7382,
    "c": 0.10685,
    "h": 222.7
  },
  "luminance": 0.41562
}

Semantic roles & 50–950 ramp

primary

#51B9DB

secondary

#DFB6A9

accent

#693FE9

background

#F9FCFE

surface

#F2F9FC

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B9DB

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

Preview Lab → · Contrast checker → · Palette generator →