#3978D2#3978D2

#3978D2 is a mid, vivid blue. Relative luminance 0.190; OKLCH L 57.7% C 0.153 H 257.7°. Best body text is #000000 at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#3978D2
RGB	rgb(57, 120, 210)
HSL	hsl(215, 63%, 52%)
HSV	hsv(215, 73%, 82%)
CMYK	cmyk(72.9%, 42.9%, 0%, 17.6%)
CIE-LAB	lab(50.63, 10.34, -52.27)
CIE-LCH	lch(50.63, 53.28, 281.19°)
OKLab	oklab(57.74% -0.0325 -0.1495)
OKLCH	oklch(57.74% 0.153 257.7)
XYZ	xyz(20.0324, 18.9537, 63.5629)
Luminance	0.1896 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3978D2 #D29339

analogous

#39C5D2 #3978D2 #4639D2

triadic

#3978D2 #D23978 #78D239

tetradic

#3978D2 #D239C5 #D29339 #39D246

square

#3978D2 #D239C5 #D29339 #39D246

split-complementary

#3978D2 #D24639 #C5D239

monochromatic

#1B4076 #265BA8 #3978D2 #6B9ADD #9DBCE9

Accessibility & contrast

On white

4.38

#3978D2 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.79

#3978D2 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3978D2

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3978D2	#FFFFFF	#000000	##000000
##3978D2	1.00	4.38	4.79	4.79
#FFFFFF	4.38	1.00	21.00	21.00
#000000	4.79	21.00	1.00	1.00
##000000	4.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C80D5

Deuteranopia (green-blind)

#3072D0

Tritanopia (blue-blind)

#008D9B

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3978d2;
/* rgb */ color: rgb(57, 120, 210);
/* oklch */ color: oklch(57.7% 0.153 257.7);

Tailwind

colors: {
  custom: {
    50: '#829ee0',
    500: '#3978d2',
    950: '#000000',
  },
}

SCSS

$custom: #3978d2;
$custom-light: #829ee0;
$custom-dark: #000000;

JSON

{
  "hex": "#3978d2",
  "rgb": {
    "r": 57,
    "g": 120,
    "b": 210
  },
  "hsl": {
    "h": 215.294,
    "s": 62.963,
    "l": 52.353
  },
  "oklch": {
    "l": 0.57736,
    "c": 0.153,
    "h": 257.7
  },
  "luminance": 0.18956
}

Semantic roles & 50–950 ramp

primary

#3978D2

secondary

#D5B992

accent

#A242E6

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3978D2

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

Preview Lab → · Contrast checker → · Palette generator →