#51B4E9#51B4E9

#51B4E9 is a light, moderate cyan. Relative luminance 0.403; OKLCH L 73.3% C 0.120 H 235.2°. Best body text is #000000 at 9.06:1 contrast (WCAG AA passes).

Color values

HEX	#51B4E9
RGB	rgb(81, 180, 233)
HSL	hsl(201, 78%, 62%)
HSV	hsv(201, 65%, 91%)
CMYK	cmyk(65.2%, 22.7%, 0%, 8.6%)
CIE-LAB	lab(69.66, -12.85, -35.03)
CIE-LCH	lch(69.66, 37.31, 249.85°)
OKLab	oklab(73.28% -0.0684 -0.0983)
OKLCH	oklch(73.28% 0.12 235.2)
XYZ	xyz(34.4169, 40.2714, 83.0343)
Luminance	0.4027 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B4E9 #E98651

analogous

#51E9D2 #51B4E9 #5168E9

triadic

#51B4E9 #E951B4 #B4E951

tetradic

#51B4E9 #D251E9 #E98651 #68E951

square

#51B4E9 #D251E9 #E98651 #68E951

split-complementary

#51B4E9 #E95168 #E9D251

monochromatic

#1676AA #1C9CE0 #51B4E9 #87CBF0 #BEE3F7

Accessibility & contrast

On white

2.32

#51B4E9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.06

#51B4E9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B4E9

9.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B4E9	#FFFFFF	#000000	##000000
##51B4E9	1.00	2.32	9.06	9.06
#FFFFFF	2.32	1.00	21.00	21.00
#000000	9.06	21.00	1.00	1.00
##000000	9.06	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#9BB3EC

Deuteranopia (green-blind)

#86A3E8

Tritanopia (blue-blind)

#00C2C6

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b4e9;
/* rgb */ color: rgb(81, 180, 233);
/* oklch */ color: oklch(73.3% 0.120 235.2);

Tailwind

colors: {
  custom: {
    50: '#91caf0',
    500: '#51b4e9',
    950: '#000000',
  },
}

SCSS

$custom: #51b4e9;
$custom-light: #91caf0;
$custom-dark: #000000;

JSON

{
  "hex": "#51b4e9",
  "rgb": {
    "r": 81,
    "g": 180,
    "b": 233
  },
  "hsl": {
    "h": 200.921,
    "s": 77.551,
    "l": 61.569
  },
  "oklch": {
    "l": 0.73278,
    "c": 0.11979,
    "h": 235.2
  },
  "luminance": 0.40275
}

Semantic roles & 50–950 ramp

primary

#51B4E9

secondary

#E7C2AF

accent

#540CDA

background

#F9FCFE

surface

#F2F8FD

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B4E9

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

Preview Lab → · Contrast checker → · Palette generator →