#3F70C7#3F70C7

#3F70C7 is a mid, vivid blue. Relative luminance 0.168; OKLCH L 55.5% C 0.145 H 260.9°. Best body text is #FFFFFF at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#3F70C7
RGB	rgb(63, 112, 199)
HSL	hsl(218, 55%, 51%)
HSV	hsv(218, 68%, 78%)
CMYK	cmyk(68.3%, 43.7%, 0%, 22%)
CIE-LAB	lab(47.96, 12.21, -50.24)
CIE-LCH	lch(47.96, 51.71, 283.66°)
OKLab	oklab(55.53% -0.0229 -0.1436)
OKLCH	oklch(55.53% 0.145 260.9)
XYZ	xyz(18.1492, 16.7668, 56.3016)
Luminance	0.1677 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F70C7 #C7963F

analogous

#3FB4C7 #3F70C7 #523FC7

triadic

#3F70C7 #C73F70 #70C73F

tetradic

#3F70C7 #C73FB4 #C7963F #3FC752

square

#3F70C7 #C73FB4 #C7963F #3FC752

split-complementary

#3F70C7 #C7523F #B4C73F

monochromatic

#203B6C #2D559B #3F70C7 #6E93D5 #9EB7E3

Accessibility & contrast

On white

4.82

#3F70C7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.35

#3F70C7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F70C7

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F70C7	#FFFFFF	#000000	##FFFFFF
##3F70C7	1.00	4.82	4.35	4.82
#FFFFFF	4.82	1.00	21.00	1.00
#000000	4.35	21.00	1.00	21.00
##FFFFFF	4.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4679CA

Deuteranopia (green-blind)

#2E6CC5

Tritanopia (blue-blind)

#008492

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3f70c7;
/* rgb */ color: rgb(63, 112, 199);
/* oklch */ color: oklch(55.5% 0.145 260.9);

Tailwind

colors: {
  custom: {
    50: '#8398d8',
    500: '#3f70c7',
    950: '#000000',
  },
}

SCSS

$custom: #3f70c7;
$custom-light: #8398d8;
$custom-dark: #000000;

JSON

{
  "hex": "#3f70c7",
  "rgb": {
    "r": 63,
    "g": 112,
    "b": 199
  },
  "hsl": {
    "h": 218.382,
    "s": 54.839,
    "l": 51.373
  },
  "oklch": {
    "l": 0.55529,
    "c": 0.14541,
    "h": 260.9
  },
  "luminance": 0.16769
}

Semantic roles & 50–950 ramp

primary

#3F70C7

secondary

#CFB993

accent

#A94ADE

background

#F8F9FD

surface

#F0F2FA

border

#CBCCD3

text

#0C0D14

muted

#7D7E83

Preview Lab

Preview with #3F70C7

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

Preview Lab → · Contrast checker → · Palette generator →