#51BCD5#51BCD5

#51BCD5 is a light, moderate cyan. Relative luminance 0.425; OKLCH L 74.3% C 0.103 H 215.7°. Best body text is #000000 at 9.50:1 contrast (WCAG AA passes).

Color values

HEX	#51BCD5
RGB	rgb(81, 188, 213)
HSL	hsl(191, 61%, 58%)
HSV	hsv(191, 62%, 84%)
CMYK	cmyk(62%, 11.7%, 0%, 16.5%)
CIE-LAB	lab(71.23, -23.20, -21.72)
CIE-LCH	lch(71.23, 31.78, 223.11°)
OKLab	oklab(74.28% -0.0839 -0.0603)
OKLCH	oklch(74.28% 0.103 215.7)
XYZ	xyz(33.3819, 42.5164, 69.3851)
Luminance	0.4252 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BCD5 #D56A51

analogous

#51D5AC #51BCD5 #517AD5

triadic

#51BCD5 #D551BC #BCD551

tetradic

#51BCD5 #AC51D5 #D56A51 #7AD551

square

#51BCD5 #AC51D5 #D56A51 #7AD551

split-complementary

#51BCD5 #D5517A #D5AC51

monochromatic

#21768A #2DA1BC #51BCD5 #82CFE1 #B4E2ED

Accessibility & contrast

On white

2.21

#51BCD5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.50

#51BCD5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BCD5

9.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BCD5	#FFFFFF	#000000	##000000
##51BCD5	1.00	2.21	9.50	9.50
#FFFFFF	2.21	1.00	21.00	21.00
#000000	9.50	21.00	1.00	1.00
##000000	9.50	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#ABB7D6

Deuteranopia (green-blind)

#97A8D5

Tritanopia (blue-blind)

#00C5C4

Achromatopsia (no color)

#AEAEAE

Design tokens & code

CSS

--color: #51bcd5;
/* rgb */ color: rgb(81, 188, 213);
/* oklch */ color: oklch(74.3% 0.103 215.7);

Tailwind

colors: {
  custom: {
    50: '#8fd0e2',
    500: '#51bcd5',
    950: '#000000',
  },
}

SCSS

$custom: #51bcd5;
$custom-light: #8fd0e2;
$custom-dark: #000000;

JSON

{
  "hex": "#51bcd5",
  "rgb": {
    "r": 81,
    "g": 188,
    "b": 213
  },
  "hsl": {
    "h": 191.364,
    "s": 61.111,
    "l": 57.647
  },
  "oklch": {
    "l": 0.74278,
    "c": 0.10338,
    "h": 215.7
  },
  "luminance": 0.4252
}

Semantic roles & 50–950 ramp

primary

#51BCD5

secondary

#DBB0A6

accent

#6244E4

background

#F9FCFD

surface

#F2F9FB

border

#CCD2D4

text

#0E1415

muted

#7E8283

Preview Lab

Preview with #51BCD5

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

Preview Lab → · Contrast checker → · Palette generator →