#51BDE5#51BDE5

#51BDE5 is a light, moderate cyan. Relative luminance 0.438; OKLCH L 75.2% C 0.113 H 225.8°. Best body text is #000000 at 9.76:1 contrast (WCAG AA passes).

Color values

HEX	#51BDE5
RGB	rgb(81, 189, 229)
HSL	hsl(196, 74%, 61%)
HSV	hsv(196, 65%, 90%)
CMYK	cmyk(64.6%, 17.5%, 0%, 10.2%)
CIE-LAB	lab(72.09, -18.86, -29.10)
CIE-LCH	lch(72.09, 34.68, 237.05°)
OKLab	oklab(75.16% -0.0789 -0.0813)
OKLCH	oklch(75.16% 0.113 225.8)
XYZ	xyz(35.7281, 43.7979, 80.6845)
Luminance	0.4380 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BDE5 #E57951

analogous

#51E5C3 #51BDE5 #5173E5

triadic

#51BDE5 #E551BD #BDE551

tetradic

#51BDE5 #C351E5 #E57951 #73E551

square

#51BDE5 #C351E5 #E57951 #73E551

split-complementary

#51BDE5 #E55173 #E5C351

monochromatic

#187EA3 #20A7D8 #51BDE5 #86D1ED #BBE5F5

Accessibility & contrast

On white

2.15

#51BDE5 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.76

#51BDE5 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BDE5

9.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BDE5	#FFFFFF	#000000	##000000
##51BDE5	1.00	2.15	9.76	9.76
#FFFFFF	2.15	1.00	21.00	21.00
#000000	9.76	21.00	1.00	1.00
##000000	9.76	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A7B9E7

Deuteranopia (green-blind)

#92AAE5

Tritanopia (blue-blind)

#00C9CA

Achromatopsia (no color)

#B1B1B1

Design tokens & code

CSS

--color: #51bde5;
/* rgb */ color: rgb(81, 189, 229);
/* oklch */ color: oklch(75.2% 0.113 225.8);

Tailwind

colors: {
  custom: {
    50: '#91d1ed',
    500: '#51bde5',
    950: '#000000',
  },
}

SCSS

$custom: #51bde5;
$custom-light: #91d1ed;
$custom-dark: #000000;

JSON

{
  "hex": "#51bde5",
  "rgb": {
    "r": 81,
    "g": 189,
    "b": 229
  },
  "hsl": {
    "h": 196.216,
    "s": 74,
    "l": 60.784
  },
  "oklch": {
    "l": 0.75164,
    "c": 0.1133,
    "h": 225.8
  },
  "luminance": 0.43802
}

Semantic roles & 50–950 ramp

primary

#51BDE5

secondary

#E5BCAD

accent

#450FD6

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1416

muted

#7E8284

Preview Lab

Preview with #51BDE5

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

Preview Lab → · Contrast checker → · Palette generator →