#3971CF#3971CF

#3971CF is a mid, vivid blue. Relative luminance 0.172; OKLCH L 56.0% C 0.157 H 260.1°. Best body text is #FFFFFF at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#3971CF
RGB	rgb(57, 113, 207)
HSL	hsl(218, 61%, 52%)
HSV	hsv(218, 72%, 81%)
CMYK	cmyk(72.5%, 45.4%, 0%, 18.8%)
CIE-LAB	lab(48.49, 13.61, -53.99)
CIE-LCH	lch(48.49, 55.68, 284.15°)
OKLab	oklab(56.02% -0.0269 -0.1547)
OKLCH	oklch(56.02% 0.157 260.1)
XYZ	xyz(18.8509, 17.1831, 61.3426)
Luminance	0.1719 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3971CF #CF9739

analogous

#39BCCF #3971CF #4C39CF

triadic

#3971CF #CF3971 #71CF39

tetradic

#3971CF #CF39BC #CF9739 #39CF4C

square

#3971CF #CF39BC #CF9739 #39CF4C

split-complementary

#3971CF #CF4C39 #BCCF39

monochromatic

#1C3C72 #2856A3 #3971CF #6A94DB #9CB8E7

Accessibility & contrast

On white

4.73

#3971CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.44

#3971CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3971CF

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3971CF	#FFFFFF	#000000	##FFFFFF
##3971CF	1.00	4.73	4.44	4.73
#FFFFFF	4.73	1.00	21.00	1.00
#000000	4.44	21.00	1.00	21.00
##FFFFFF	4.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#417BD3

Deuteranopia (green-blind)

#216DCD

Tritanopia (blue-blind)

#008796

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3971cf;
/* rgb */ color: rgb(57, 113, 207);
/* oklch */ color: oklch(56.0% 0.157 260.1);

Tailwind

colors: {
  custom: {
    50: '#8299de',
    500: '#3971cf',
    950: '#000000',
  },
}

SCSS

$custom: #3971cf;
$custom-light: #8299de;
$custom-dark: #000000;

JSON

{
  "hex": "#3971cf",
  "rgb": {
    "r": 57,
    "g": 113,
    "b": 207
  },
  "hsl": {
    "h": 217.6,
    "s": 60.976,
    "l": 51.765
  },
  "oklch": {
    "l": 0.56023,
    "c": 0.15702,
    "h": 260.1
  },
  "luminance": 0.17185
}

Semantic roles & 50–950 ramp

primary

#3971CF

secondary

#D3BA91

accent

#A844E4

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3971CF

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

Preview Lab → · Contrast checker → · Palette generator →