#51A5DB#51A5DB

#51A5DB is a light, moderate cyan. Relative luminance 0.338; OKLCH L 69.2% C 0.114 H 239.5°. Best body text is #000000 at 7.75:1 contrast (WCAG AA passes).

Color values

HEX#51A5DB
RGBrgb(81, 165, 219)
HSLhsl(203, 66%, 59%)
HSVhsv(203, 63%, 86%)
CMYKcmyk(63%, 24.7%, 0%, 14.1%)
CIE-LABlab(64.78, -9.17, -34.93)
CIE-LCHlch(64.78, 36.12, 255.30°)
OKLaboklab(69.21% -0.0578 -0.0981)
OKLCHoklch(69.21% 0.114 239.5)
XYZxyz(29.6298, 33.7711, 71.9611)
Luminance0.3377 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#51A5DB #DB8751
analogous
#51DBCC #51A5DB #5160DB
triadic
#51A5DB #DB51A5 #A5DB51
tetradic
#51A5DB #CC51DB #DB8751 #60DB51
square
#51A5DB #CC51DB #DB8751 #60DB51
split-complementary
#51A5DB #DB5160 #DBCC51
monochromatic
#1E6593 #2988C6 #51A5DB #84BFE5 #B6D9F0

Accessibility & contrast

On white

2.71
#51A5DB on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

7.75
#51A5DB on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #51A5DB
7.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##51A5DB#FFFFFF#000000##000000
##51A5DB1.002.717.757.75
#FFFFFF2.711.0021.0021.00
#0000007.7521.001.001.00
##0000007.7521.001.001.00

Color blindness preview

Protanopia (red-blind)
#8CA5DE
Deuteranopia (green-blind)
#7997DA
Tritanopia (blue-blind)
#00B3B7
Achromatopsia (no color)
#9D9D9D

Design tokens & code

CSS
--color: #51a5db;
/* rgb */ color: rgb(81, 165, 219);
/* oklch */ color: oklch(69.2% 0.114 239.5);
Tailwind
colors: {
  custom: {
    50: '#8ebfe6',
    500: '#51a5db',
    950: '#000000',
  },
}
SCSS
$custom: #51a5db;
$custom-light: #8ebfe6;
$custom-dark: #000000;
JSON
{
  "hex": "#51a5db",
  "rgb": {
    "r": 81,
    "g": 165,
    "b": 219
  },
  "hsl": {
    "h": 203.478,
    "s": 65.714,
    "l": 58.824
  },
  "oklch": {
    "l": 0.69212,
    "c": 0.11387,
    "h": 239.5
  },
  "luminance": 0.33774
}

Semantic roles & 50–950 ramp

primary
#51A5DB
secondary
#DFBEA9
accent
#813FE9
background
#F9FBFE
surface
#F2F7FC
border
#CCD0D5
text
#0D1216
muted
#7E8184

Preview Lab

Preview with #51A5DB

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

Preview Lab → · Contrast checker → · Palette generator →

#51A5DB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva