#51A9DD#51A9DD

#51A9DD is a light, moderate cyan. Relative luminance 0.353; OKLCH L 70.2% C 0.114 H 237.4°. Best body text is #000000 at 8.07:1 contrast (WCAG AA passes).

Color values

HEX	#51A9DD
RGB	rgb(81, 169, 221)
HSL	hsl(202, 67%, 59%)
HSV	hsv(202, 63%, 87%)
CMYK	cmyk(63.3%, 23.5%, 0%, 13.3%)
CIE-LAB	lab(66.01, -10.72, -34.12)
CIE-LCH	lch(66.01, 35.76, 252.56°)
OKLab	oklab(70.22% -0.0612 -0.0958)
OKLCH	oklch(70.22% 0.114 237.4)
XYZ	xyz(30.6274, 35.3426, 73.6003)
Luminance	0.3535 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51A9DD #DD8551

analogous

#51DDCB #51A9DD #5163DD

triadic

#51A9DD #DD51A9 #A9DD51

tetradic

#51A9DD #CB51DD #DD8551 #63DD51

square

#51A9DD #CB51DD #DD8551 #63DD51

split-complementary

#51A9DD #DD5163 #DDCB51

monochromatic

#1D6996 #278DC9 #51A9DD #84C2E7 #B7DCF1

Accessibility & contrast

On white

2.60

#51A9DD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

8.07

#51A9DD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A9DD

8.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51A9DD	#FFFFFF	#000000	##000000
##51A9DD	1.00	2.60	8.07	8.07
#FFFFFF	2.60	1.00	21.00	21.00
#000000	8.07	21.00	1.00	1.00
##000000	8.07	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#91A8DF

Deuteranopia (green-blind)

#7E9ADC

Tritanopia (blue-blind)

#00B6BB

Achromatopsia (no color)

#A0A0A0

Design tokens & code

CSS

--color: #51a9dd;
/* rgb */ color: rgb(81, 169, 221);
/* oklch */ color: oklch(70.2% 0.114 237.4);

Tailwind

colors: {
  custom: {
    50: '#8fc2e7',
    500: '#51a9dd',
    950: '#000000',
  },
}

SCSS

$custom: #51a9dd;
$custom-light: #8fc2e7;
$custom-dark: #000000;

JSON

{
  "hex": "#51a9dd",
  "rgb": {
    "r": 81,
    "g": 169,
    "b": 221
  },
  "hsl": {
    "h": 202.286,
    "s": 67.308,
    "l": 59.216
  },
  "oklch": {
    "l": 0.70218,
    "c": 0.11367,
    "h": 237.4
  },
  "luminance": 0.35346
}

Semantic roles & 50–950 ramp

primary

#51A9DD

secondary

#E0BEAA

accent

#7E3EEA

background

#F9FBFE

surface

#F2F7FC

border

#CCD0D5

text

#0E1216

muted

#7E8184

Preview Lab

Preview with #51A9DD

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

Preview Lab → · Contrast checker → · Palette generator →