#51B7DD#51B7DD

#51B7DD is a light, moderate cyan. Relative luminance 0.408; OKLCH L 73.4% C 0.109 H 225.8°. Best body text is #000000 at 9.17:1 contrast (WCAG AA passes).

Color values

HEX	#51B7DD
RGB	rgb(81, 183, 221)
HSL	hsl(196, 67%, 59%)
HSV	hsv(196, 63%, 87%)
CMYK	cmyk(63.3%, 17.2%, 0%, 13.3%)
CIE-LAB	lab(70.06, -18.20, -27.87)
CIE-LCH	lch(70.06, 33.29, 236.85°)
OKLab	oklab(73.44% -0.0757 -0.0778)
OKLCH	oklch(73.44% 0.109 225.8)
XYZ	xyz(33.3728, 40.8333, 74.5154)
Luminance	0.4084 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B7DD #DD7751

analogous

#51DDBD #51B7DD #5171DD

triadic

#51B7DD #DD51B7 #B7DD51

tetradic

#51B7DD #BD51DD #DD7751 #71DD51

square

#51B7DD #BD51DD #DD7751 #71DD51

split-complementary

#51B7DD #DD5171 #DDBD51

monochromatic

#1D7596 #279DC9 #51B7DD #84CCE7 #B7E1F1

Accessibility & contrast

On white

2.29

#51B7DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.17

#51B7DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B7DD

9.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B7DD	#FFFFFF	#000000	##000000
##51B7DD	1.00	2.29	9.17	9.17
#FFFFFF	2.29	1.00	21.00	21.00
#000000	9.17	21.00	1.00	1.00
##000000	9.17	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A2B3DF

Deuteranopia (green-blind)

#8FA5DD

Tritanopia (blue-blind)

#00C2C3

Achromatopsia (no color)

#ABABAB

Design tokens & code

CSS

--color: #51b7dd;
/* rgb */ color: rgb(81, 183, 221);
/* oklch */ color: oklch(73.4% 0.109 225.8);

Tailwind

colors: {
  custom: {
    50: '#90cce7',
    500: '#51b7dd',
    950: '#000000',
  },
}

SCSS

$custom: #51b7dd;
$custom-light: #90cce7;
$custom-dark: #000000;

JSON

{
  "hex": "#51b7dd",
  "rgb": {
    "r": 81,
    "g": 183,
    "b": 221
  },
  "hsl": {
    "h": 196.286,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.73439,
    "c": 0.10855,
    "h": 225.8
  },
  "luminance": 0.40837
}

Semantic roles & 50–950 ramp

primary

#51B7DD

secondary

#E0B8AA

accent

#6C3EEA

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B7DD

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

Preview Lab → · Contrast checker → · Palette generator →