#51B5DC#51B5DC

#51B5DC is a light, moderate cyan. Relative luminance 0.400; OKLCH L 72.9% C 0.108 H 226.8°. Best body text is #000000 at 8.99:1 contrast (WCAG AA passes).

Color values

HEX	#51B5DC
RGB	rgb(81, 181, 220)
HSL	hsl(197, 67%, 59%)
HSV	hsv(197, 63%, 86%)
CMYK	cmyk(63.2%, 17.7%, 0%, 13.7%)
CIE-LAB	lab(69.44, -17.46, -28.27)
CIE-LCH	lch(69.44, 33.23, 238.30°)
OKLab	oklab(72.93% -0.074 -0.079)
OKLCH	oklch(72.93% 0.108 226.8)
XYZ	xyz(32.8304, 39.9610, 73.6793)
Luminance	0.3996 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5DC #DC7851

analogous

#51DCBE #51B5DC #5170DC

triadic

#51B5DC #DC51B5 #B5DC51

tetradic

#51B5DC #BE51DC #DC7851 #70DC51

square

#51B5DC #BE51DC #DC7851 #70DC51

split-complementary

#51B5DC #DC5170 #DCBE51

monochromatic

#1E7395 #289BC8 #51B5DC #84CBE6 #B7E0F0

Accessibility & contrast

On white

2.34

#51B5DC on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.99

#51B5DC on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5DC

8.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5DC	#FFFFFF	#000000	##000000
##51B5DC	1.00	2.34	8.99	8.99
#FFFFFF	2.34	1.00	21.00	21.00
#000000	8.99	21.00	1.00	1.00
##000000	8.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B2DE

Deuteranopia (green-blind)

#8DA3DC

Tritanopia (blue-blind)

#00C0C2

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b5dc;
/* rgb */ color: rgb(81, 181, 220);
/* oklch */ color: oklch(72.9% 0.108 226.8);

Tailwind

colors: {
  custom: {
    50: '#8fcbe7',
    500: '#51b5dc',
    950: '#000000',
  },
}

SCSS

$custom: #51b5dc;
$custom-light: #8fcbe7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5dc",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 220
  },
  "hsl": {
    "h": 196.835,
    "s": 66.507,
    "l": 59.02
  },
  "oklch": {
    "l": 0.72934,
    "c": 0.10822,
    "h": 226.8
  },
  "luminance": 0.39964
}

Semantic roles & 50–950 ramp

primary

#51B5DC

secondary

#E0B8A9

accent

#6E3EE9

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B5DC

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

Preview Lab → · Contrast checker → · Palette generator →