#51BBE6#51BBE6

#51BBE6 is a light, moderate cyan. Relative luminance 0.430; OKLCH L 74.7% C 0.115 H 228.1°. Best body text is #000000 at 9.60:1 contrast (WCAG AA passes).

Color values

HEX	#51BBE6
RGB	rgb(81, 187, 230)
HSL	hsl(197, 75%, 61%)
HSV	hsv(197, 65%, 90%)
CMYK	cmyk(64.8%, 18.7%, 0%, 9.8%)
CIE-LAB	lab(71.55, -17.51, -30.47)
CIE-LCH	lch(71.55, 35.14, 240.12°)
OKLab	oklab(74.75% -0.0765 -0.0852)
OKLCH	oklch(74.75% 0.115 228.1)
XYZ	xyz(35.4409, 42.9994, 81.2795)
Luminance	0.4300 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51BBE6 #E67C51

analogous

#51E6C6 #51BBE6 #5170E6

triadic

#51BBE6 #E651BB #BBE651

tetradic

#51BBE6 #C651E6 #E67C51 #70E651

square

#51BBE6 #C651E6 #E67C51 #70E651

split-complementary

#51BBE6 #E65170 #E6C651

monochromatic

#187CA5 #1FA4DA #51BBE6 #87D0EE #BCE5F5

Accessibility & contrast

On white

2.19

#51BBE6 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.60

#51BBE6 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51BBE6

9.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51BBE6	#FFFFFF	#000000	##000000
##51BBE6	1.00	2.19	9.60	9.60
#FFFFFF	2.19	1.00	21.00	21.00
#000000	9.60	21.00	1.00	1.00
##000000	9.60	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A4B8E8

Deuteranopia (green-blind)

#90A9E5

Tritanopia (blue-blind)

#00C7C9

Achromatopsia (no color)

#AFAFAF

Design tokens & code

CSS

--color: #51bbe6;
/* rgb */ color: rgb(81, 187, 230);
/* oklch */ color: oklch(74.7% 0.115 228.1);

Tailwind

colors: {
  custom: {
    50: '#91cfee',
    500: '#51bbe6',
    950: '#000000',
  },
}

SCSS

$custom: #51bbe6;
$custom-light: #91cfee;
$custom-dark: #000000;

JSON

{
  "hex": "#51bbe6",
  "rgb": {
    "r": 81,
    "g": 187,
    "b": 230
  },
  "hsl": {
    "h": 197.315,
    "s": 74.874,
    "l": 60.98
  },
  "oklch": {
    "l": 0.74746,
    "c": 0.11453,
    "h": 228.1
  },
  "luminance": 0.43003
}

Semantic roles & 50–950 ramp

primary

#51BBE6

secondary

#E5BEAD

accent

#480ED7

background

#F9FCFE

surface

#F2F9FD

border

#CCD2D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51BBE6

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

Preview Lab → · Contrast checker → · Palette generator →