#3988AB#3988AB

#3988AB is a mid, moderate cyan. Relative luminance 0.214; OKLCH L 59.3% C 0.093 H 230.3°. Best body text is #000000 at 5.28:1 contrast (WCAG AA passes).

Color values

HEX#3988AB
RGBrgb(57, 136, 171)
HSLhsl(198, 50%, 45%)
HSVhsv(198, 67%, 67%)
CMYKcmyk(66.7%, 20.5%, 0%, 32.9%)
CIE-LABlab(53.40, -12.87, -25.60)
CIE-LCHlch(53.40, 28.65, 243.30°)
OKLaboklab(59.28% -0.0594 -0.0717)
OKLCHoklch(59.28% 0.093 230.3)
XYZxyz(17.8393, 21.4166, 41.7138)
Luminance0.2142 (WCAG relative)
Temperaturecool
Familycyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#3988AB #AB5C39
analogous
#39AB95 #3988AB #394FAB
triadic
#3988AB #AB3988 #88AB39
tetradic
#3988AB #9539AB #AB5C39 #4FAB39
square
#3988AB #9539AB #AB5C39 #4FAB39
split-complementary
#3988AB #AB394F #AB9539
monochromatic
#1A3F4F #2A637D #3988AB #59A6C8 #87BFD7

Accessibility & contrast

On white

3.97
#3988AB on #FFFFFF
AA ✗AA large ✓AAA ✗

On black

5.28
#3988AB on #000000
AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3988AB
5.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##3988AB#FFFFFF#000000##000000
##3988AB1.003.975.285.28
#FFFFFF3.971.0021.0021.00
#0000005.2821.001.001.00
##0000005.2821.001.001.00

Color blindness preview

Protanopia (red-blind)
#7686AD
Deuteranopia (green-blind)
#667AAB
Tritanopia (blue-blind)
#009294
Achromatopsia (no color)
#808080

Design tokens & code

CSS
--color: #3988ab;
/* rgb */ color: rgb(57, 136, 171);
/* oklch */ color: oklch(59.3% 0.093 230.3);
Tailwind
colors: {
  custom: {
    50: '#7caac4',
    500: '#3988ab',
    950: '#000000',
  },
}
SCSS
$custom: #3988ab;
$custom-light: #7caac4;
$custom-dark: #000000;
JSON
{
  "hex": "#3988ab",
  "rgb": {
    "r": 57,
    "g": 136,
    "b": 171
  },
  "hsl": {
    "h": 198.421,
    "s": 50,
    "l": 44.706
  },
  "oklch": {
    "l": 0.59283,
    "c": 0.09309,
    "h": 230.3
  },
  "luminance": 0.21418
}

Semantic roles & 50–950 ramp

primary
#3988AB
secondary
#C1937F
accent
#794EDA
background
#F8FAFC
surface
#EFF4F8
border
#CACED1
text
#0B1012
muted
#7C7F81

Preview Lab

Preview with #3988AB

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

Preview Lab → · Contrast checker → · Palette generator →

#3988AB Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva