#51A9CD#51A9CD

#51A9CD is a light, moderate cyan. Relative luminance 0.345; OKLCH L 69.5% C 0.099 H 227.6°. Best body text is #000000 at 7.91:1 contrast (WCAG AA passes).

Color values

HEX	#51A9CD
RGB	rgb(81, 169, 205)
HSL	hsl(197, 55%, 56%)
HSV	hsv(197, 60%, 80%)
CMYK	cmyk(60.5%, 17.6%, 0%, 19.6%)
CIE-LAB	lab(65.38, -15.74, -26.26)
CIE-LCH	lch(65.38, 30.62, 239.06°)
OKLab	oklab(69.51% -0.0669 -0.0732)
OKLCH	oklch(69.51% 0.099 227.6)
XYZ	xyz(28.5965, 34.5302, 62.9037)
Luminance	0.3453 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51A9CD #CD7551

analogous

#51CDB3 #51A9CD #516BCD

triadic

#51A9CD #CD51A9 #A9CD51

tetradic

#51A9CD #B351CD #CD7551 #6BCD51

square

#51A9CD #B351CD #CD7551 #6BCD51

split-complementary

#51A9CD #CD516B #CDB351

monochromatic

#25657F #328AAF #51A9CD #81C0DB #B0D8E8

Accessibility & contrast

On white

2.66

#51A9CD on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.91

#51A9CD on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A9CD

7.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51A9CD	#FFFFFF	#000000	##000000
##51A9CD	1.00	2.66	7.91	7.91
#FFFFFF	2.66	1.00	21.00	21.00
#000000	7.91	21.00	1.00	1.00
##000000	7.91	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#96A6CF

Deuteranopia (green-blind)

#8499CD

Tritanopia (blue-blind)

#00B3B5

Achromatopsia (no color)

#9F9F9F

Design tokens & code

CSS

--color: #51a9cd;
/* rgb */ color: rgb(81, 169, 205);
/* oklch */ color: oklch(69.5% 0.099 227.6);

Tailwind

colors: {
  custom: {
    50: '#8dc2dc',
    500: '#51a9cd',
    950: '#000000',
  },
}

SCSS

$custom: #51a9cd;
$custom-light: #8dc2dc;
$custom-dark: #000000;

JSON

{
  "hex": "#51a9cd",
  "rgb": {
    "r": 81,
    "g": 169,
    "b": 205
  },
  "hsl": {
    "h": 197.419,
    "s": 55.357,
    "l": 56.078
  },
  "oklch": {
    "l": 0.69505,
    "c": 0.09917,
    "h": 227.6
  },
  "luminance": 0.34533
}

Semantic roles & 50–950 ramp

primary

#51A9CD

secondary

#D7B2A3

accent

#7549DF

background

#F9FBFD

surface

#F1F7FB

border

#CBD0D4

text

#0D1215

muted

#7E8183

Preview Lab

Preview with #51A9CD

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

Preview Lab → · Contrast checker → · Palette generator →