#40B9D8#40B9D8

#40B9D8 is a light, moderate cyan. Relative luminance 0.407; OKLCH L 73.2% C 0.113 H 218.5°. Best body text is #000000 at 9.15:1 contrast (WCAG AA passes).

Color values

HEX#40B9D8
RGBrgb(64, 185, 216)
HSLhsl(192, 66%, 55%)
HSVhsv(192, 70%, 85%)
CMYKcmyk(70.4%, 14.4%, 0%, 15.3%)
CIE-LABlab(69.99, -23.37, -25.28)
CIE-LCHlch(69.99, 34.42, 227.25°)
OKLaboklab(73.2% -0.0886 -0.0705)
OKLCHoklch(73.2% 0.113 218.5)
XYZxyz(31.8528, 40.7421, 71.1377)
Luminance0.4075 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#40B9D8 #D85F40
analogous
#40D8AB #40B9D8 #406DD8
triadic
#40B9D8 #D840B9 #B9D840
tetradic
#40B9D8 #AB40D8 #D85F40 #6DD840
square
#40B9D8 #AB40D8 #D85F40 #6DD840
split-complementary
#40B9D8 #D8406D #D8AB40
monochromatic
#1B6E83 #2598B6 #40B9D8 #73CCE2 #A6DEED

Accessibility & contrast

On white

2.30
#40B9D8 on #FFFFFF
AA ✗AA large ✗AAA ✗

On black

9.15
#40B9D8 on #000000
AA ✓AA large ✓AAA ✓

Best text color

#000000 on #40B9D8
9.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##40B9D8#FFFFFF#000000##000000
##40B9D81.002.309.159.15
#FFFFFF2.301.0021.0021.00
#0000009.1521.001.001.00
##0000009.1521.001.001.00

Color blindness preview

Protanopia (red-blind)
#A5B4DA
Deuteranopia (green-blind)
#90A4D8
Tritanopia (blue-blind)
#00C4C3
Achromatopsia (no color)
#ABABAB

Design tokens & code

CSS
--color: #40b9d8;
/* rgb */ color: rgb(64, 185, 216);
/* oklch */ color: oklch(73.2% 0.113 218.5);
Tailwind
colors: {
  custom: {
    50: '#88cee4',
    500: '#40b9d8',
    950: '#000000',
  },
}
SCSS
$custom: #40b9d8;
$custom-light: #88cee4;
$custom-dark: #000000;
JSON
{
  "hex": "#40b9d8",
  "rgb": {
    "r": 64,
    "g": 185,
    "b": 216
  },
  "hsl": {
    "h": 192.237,
    "s": 66.087,
    "l": 54.902
  },
  "oklch": {
    "l": 0.73196,
    "c": 0.11328,
    "h": 218.5
  },
  "luminance": 0.40746
}

Semantic roles & 50–950 ramp

primary
#40B9D8
secondary
#DAA79A
accent
#613FE9
background
#F9FCFD
surface
#F1F9FB
border
#CBD2D4
text
#0D1315
muted
#7E8283

Preview Lab

Preview with #40B9D8

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

Preview Lab → · Contrast checker → · Palette generator →

#40B9D8 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva