#3F78CF#3F78CF

#3F78CF is a mid, vivid blue. Relative luminance 0.190; OKLCH L 57.8% C 0.147 H 258.7°. Best body text is #000000 at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#3F78CF
RGB	rgb(63, 120, 207)
HSL	hsl(216, 60%, 53%)
HSV	hsv(216, 70%, 81%)
CMYK	cmyk(69.6%, 42%, 0%, 18.8%)
CIE-LAB	lab(50.68, 10.11, -50.48)
CIE-LCH	lch(50.68, 51.48, 281.33°)
OKLab	oklab(57.78% -0.0288 -0.1442)
OKLCH	oklch(57.78% 0.147 258.7)
XYZ	xyz(20.0248, 18.9926, 61.6300)
Luminance	0.1900 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F78CF #CF963F

analogous

#3FC0CF #3F78CF #4E3FCF

triadic

#3F78CF #CF3F78 #78CF3F

tetradic

#3F78CF #CF3FC0 #CF963F #3FCF4E

square

#3F78CF #CF3FC0 #CF963F #3FCF4E

split-complementary

#3F78CF #CF4E3F #C0CF3F

monochromatic

#1E4176 #2A5BA7 #3F78CF #709ADB #A1BDE7

Accessibility & contrast

On white

4.38

#3F78CF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.80

#3F78CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3F78CF

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F78CF	#FFFFFF	#000000	##000000
##3F78CF	1.00	4.38	4.80	4.80
#FFFFFF	4.38	1.00	21.00	21.00
#000000	4.80	21.00	1.00	1.00
##000000	4.80	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F80D2

Deuteranopia (green-blind)

#3772CD

Tritanopia (blue-blind)

#008C99

Achromatopsia (no color)

#797979

Design tokens & code

CSS

--color: #3f78cf;
/* rgb */ color: rgb(63, 120, 207);
/* oklch */ color: oklch(57.8% 0.147 258.7);

Tailwind

colors: {
  custom: {
    50: '#849ede',
    500: '#3f78cf',
    950: '#000000',
  },
}

SCSS

$custom: #3f78cf;
$custom-light: #849ede;
$custom-dark: #000000;

JSON

{
  "hex": "#3f78cf",
  "rgb": {
    "r": 63,
    "g": 120,
    "b": 207
  },
  "hsl": {
    "h": 216.25,
    "s": 60,
    "l": 52.941
  },
  "oklch": {
    "l": 0.57777,
    "c": 0.14702,
    "h": 258.7
  },
  "luminance": 0.18995
}

Semantic roles & 50–950 ramp

primary

#3F78CF

secondary

#D4BB96

accent

#A445E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0E15

muted

#7D7E83

Preview Lab

Preview with #3F78CF

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

Preview Lab → · Contrast checker → · Palette generator →