#40A3F9#40A3F9

#40A3F9 is a light, vivid cyan. Relative luminance 0.341; OKLCH L 69.7% C 0.156 H 248.5°. Best body text is #000000 at 7.82:1 contrast (WCAG AA passes).

Color values

HEX	#40A3F9
RGB	rgb(64, 163, 249)
HSL	hsl(208, 94%, 61%)
HSV	hsv(208, 74%, 98%)
CMYK	cmyk(74.3%, 34.5%, 0%, 2.4%)
CIE-LAB	lab(65.06, -0.45, -51.01)
CIE-LCH	lch(65.06, 51.01, 269.49°)
OKLab	oklab(69.73% -0.0572 -0.1451)
OKLCH	oklch(69.73% 0.156 248.5)
XYZ	xyz(32.3039, 34.1202, 94.4875)
Luminance	0.3412 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#40A3F9 #F99640

analogous

#40F9F3 #40A3F9 #4047F9

triadic

#40A3F9 #F940A3 #A3F940

tetradic

#40A3F9 #F340F9 #F99640 #47F940

square

#40A3F9 #F340F9 #F99640 #47F940

split-complementary

#40A3F9 #F94047 #F9F340

monochromatic

#0666B9 #0886F4 #40A3F9 #7BC0FB #B7DCFD

Accessibility & contrast

On white

2.68

#40A3F9 on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.82

#40A3F9 on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #40A3F9

7.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##40A3F9	#FFFFFF	#000000	##000000
##40A3F9	1.00	2.68	7.82	7.82
#FFFFFF	2.68	1.00	21.00	21.00
#000000	7.82	21.00	1.00	1.00
##000000	7.82	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7BA7FD

Deuteranopia (green-blind)

#6096F7

Tritanopia (blue-blind)

#00B8C2

Achromatopsia (no color)

#9E9E9E

Design tokens & code

CSS

--color: #40a3f9;
/* rgb */ color: rgb(64, 163, 249);
/* oklch */ color: oklch(69.7% 0.156 248.5);

Tailwind

colors: {
  custom: {
    50: '#8cbdfb',
    500: '#40a3f9',
    950: '#000000',
  },
}

SCSS

$custom: #40a3f9;
$custom-light: #8cbdfb;
$custom-dark: #000000;

JSON

{
  "hex": "#40a3f9",
  "rgb": {
    "r": 64,
    "g": 163,
    "b": 249
  },
  "hsl": {
    "h": 207.892,
    "s": 93.909,
    "l": 61.373
  },
  "oklch": {
    "l": 0.69734,
    "c": 0.15592,
    "h": 248.5
  },
  "luminance": 0.34124
}

Semantic roles & 50–950 ramp

primary

#40A3F9

secondary

#EDC8A8

accent

#6B00E6

background

#F9FBFF

surface

#F2F6FF

border

#CCD0D7

text

#0E1217

muted

#7E8185

Preview Lab

Preview with #40A3F9

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

Preview Lab → · Contrast checker → · Palette generator →