#42A5CF#42A5CF

#42A5CF is a light, moderate cyan. Relative luminance 0.326; OKLCH L 68.1% C 0.110 H 229.6°. Best body text is #000000 at 7.51:1 contrast (WCAG AA passes).

Color values

HEX	#42A5CF
RGB	rgb(66, 165, 207)
HSL	hsl(198, 59%, 54%)
HSV	hsv(198, 68%, 81%)
CMYK	cmyk(68.1%, 20.3%, 0%, 18.8%)
CIE-LAB	lab(63.81, -15.49, -29.83)
CIE-LCH	lch(63.81, 33.61, 242.55°)
OKLab	oklab(68.15% -0.071 -0.0836)
OKLCH	oklch(68.15% 0.11 229.6)
XYZ	xyz(26.9599, 32.5706, 63.8853)
Luminance	0.3257 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42A5CF #CF6C42

analogous

#42CFB2 #42A5CF #425ECF

triadic

#42A5CF #CF42A5 #A5CF42

tetradic

#42A5CF #B242CF #CF6C42 #5ECF42

square

#42A5CF #B242CF #CF6C42 #5ECF42

split-complementary

#42A5CF #CF425E #CFB242

monochromatic

#1F5D78 #2B83A9 #42A5CF #73BCDB #A4D3E8

Accessibility & contrast

On white

2.79

#42A5CF on #FFFFFF

AA ✗AA large ✗AAA ✗

On black

7.51

#42A5CF on #000000

AA ✓AA large ✓AAA ✓

Best text color

#000000 on #42A5CF

7.51:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42A5CF	#FFFFFF	#000000	##000000
##42A5CF	1.00	2.79	7.51	7.51
#FFFFFF	2.79	1.00	21.00	21.00
#000000	7.51	21.00	1.00	1.00
##000000	7.51	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#8FA3D1

Deuteranopia (green-blind)

#7C94CE

Tritanopia (blue-blind)

#00B1B3

Achromatopsia (no color)

#9B9B9B

Design tokens & code

CSS

--color: #42a5cf;
/* rgb */ color: rgb(66, 165, 207);
/* oklch */ color: oklch(68.1% 0.110 229.6);

Tailwind

colors: {
  custom: {
    50: '#86bfdd',
    500: '#42a5cf',
    950: '#000000',
  },
}

SCSS

$custom: #42a5cf;
$custom-light: #86bfdd;
$custom-dark: #000000;

JSON

{
  "hex": "#42a5cf",
  "rgb": {
    "r": 66,
    "g": 165,
    "b": 207
  },
  "hsl": {
    "h": 197.872,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.68145,
    "c": 0.1097,
    "h": 229.6
  },
  "luminance": 0.32574
}

Semantic roles & 50–950 ramp

primary

#42A5CF

secondary

#D5AA98

accent

#7445E3

background

#F8FBFD

surface

#F0F7FB

border

#CBD0D4

text

#0C1215

muted

#7D8183

Preview Lab

Preview with #42A5CF

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

Preview Lab → · Contrast checker → · Palette generator →