#51B5DE#51B5DE

#51B5DE is a light, moderate cyan. Relative luminance 0.401; OKLCH L 73.0% C 0.110 H 228.1°. Best body text is #000000 at 9.01:1 contrast (WCAG AA passes).

Color values

HEX	#51B5DE
RGB	rgb(81, 181, 222)
HSL	hsl(197, 68%, 59%)
HSV	hsv(197, 64%, 87%)
CMYK	cmyk(63.5%, 18.5%, 0%, 12.9%)
CIE-LAB	lab(69.52, -16.85, -29.25)
CIE-LCH	lch(69.52, 33.75, 240.06°)
OKLab	oklab(73.02% -0.0733 -0.0817)
OKLCH	oklch(73.02% 0.11 228.1)
XYZ	xyz(33.0968, 40.0676, 75.0827)
Luminance	0.4007 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51B5DE #DE7A51

analogous

#51DEC1 #51B5DE #516FDE

triadic

#51B5DE #DE51B5 #B5DE51

tetradic

#51B5DE #C151DE #DE7A51 #6FDE51

square

#51B5DE #C151DE #DE7A51 #6FDE51

split-complementary

#51B5DE #DE516F #DEC151

monochromatic

#1D7498 #279BCB #51B5DE #84CBE8 #B8E1F2

Accessibility & contrast

On white

2.33

#51B5DE on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

9.01

#51B5DE on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51B5DE

9.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51B5DE	#FFFFFF	#000000	##000000
##51B5DE	1.00	2.33	9.01	9.01
#FFFFFF	2.33	1.00	21.00	21.00
#000000	9.01	21.00	1.00	1.00
##000000	9.01	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#A0B2E0

Deuteranopia (green-blind)

#8CA3DD

Tritanopia (blue-blind)

#00C1C2

Achromatopsia (no color)

#AAAAAA

Design tokens & code

CSS

--color: #51b5de;
/* rgb */ color: rgb(81, 181, 222);
/* oklch */ color: oklch(73.0% 0.110 228.1);

Tailwind

colors: {
  custom: {
    50: '#90cbe8',
    500: '#51b5de',
    950: '#000000',
  },
}

SCSS

$custom: #51b5de;
$custom-light: #90cbe8;
$custom-dark: #000000;

JSON

{
  "hex": "#51b5de",
  "rgb": {
    "r": 81,
    "g": 181,
    "b": 222
  },
  "hsl": {
    "h": 197.447,
    "s": 68.116,
    "l": 59.412
  },
  "oklch": {
    "l": 0.73019,
    "c": 0.10979,
    "h": 228.1
  },
  "luminance": 0.40071
}

Semantic roles & 50–950 ramp

primary

#51B5DE

secondary

#E1BAAA

accent

#6F3DEB

background

#F9FCFE

surface

#F2F8FC

border

#CCD1D5

text

#0E1316

muted

#7E8284

Preview Lab

Preview with #51B5DE

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

Preview Lab → · Contrast checker → · Palette generator →