#3739B4#3739B4
#3739B4 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.9% C 0.189 H 274.3°. Best body text is #FFFFFF at 8.73:1 contrast (WCAG AA passes).
Color values
| HEX | #3739B4 |
|---|---|
| RGB | rgb(55, 57, 180) |
| HSL | hsl(239, 53%, 46%) |
| HSV | hsv(239, 69%, 71%) |
| CMYK | cmyk(69.4%, 68.3%, 0%, 29.4%) |
| CIE-LAB | lab(31.88, 39.29, -65.24) |
| CIE-LCH | lch(31.88, 76.15, 301.06°) |
| OKLab | oklab(42.91% 0.0142 -0.1885) |
| OKLCH | oklch(42.91% 0.189 274.3) |
| XYZ | xyz(11.2742, 7.0327, 43.9345) |
| Luminance | 0.0703 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Sapphire (survey)
#2138AB
ΔE00 2.74
Ocean Blue
#4F42B5
ΔE00 3.76
Blue Blue
#2242C7
ΔE00 3.96
Blue With A Hint Of Purple
#533CC6
ΔE00 4.61
Blurple
#5539CC
ΔE00 5.30
Blueberry
#464196
ΔE00 5.59
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#3739B4 #B4B237
analogous
#3777B4 #3739B4 #7337B4
triadic
#3739B4 #B43739 #39B437
tetradic
#3739B4 #B43777 #B4B237 #37B473
square
#3739B4 #B43777 #B4B237 #37B473
split-complementary
#3739B4 #B47337 #77B437
monochromatic
#1A1B56 #292A85 #3739B4 #5B5DCD #8A8BDB
Accessibility & contrast
On white
8.73
#3739B4 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.41
#3739B4 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #3739B4
8.73:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##3739B4 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##3739B4 | 1.00 | 8.73 | 2.41 | 8.73 |
| #FFFFFF | 8.73 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.41 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.73 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0051B8
Deuteranopia (green-blind)
#0045B2
Tritanopia (blue-blind)
#005A72
Achromatopsia (no color)
#4B4B4B
Design tokens & code
CSS
--color: #3739b4; /* rgb */ color: rgb(55, 57, 180); /* oklch */ color: oklch(42.9% 0.189 274.3);
Tailwind
colors: {
custom: {
50: '#7f70cc',
500: '#3739b4',
950: '#000000',
},
}SCSS
$custom: #3739b4; $custom-light: #7f70cc; $custom-dark: #000000;
JSON
{
"hex": "#3739b4",
"rgb": {
"r": 55,
"g": 57,
"b": 180
},
"hsl": {
"h": 239.04,
"s": 53.191,
"l": 46.078
},
"oklch": {
"l": 0.42908,
"c": 0.18901,
"h": 274.3
},
"luminance": 0.07034
}Semantic roles & 50–950 ramp
primary
#3739B4
secondary
#C6C481
accent
#DA4BDD
background
#F8F6FC
surface
#F0ECF9
border
#CBC7D2
text
#0B0713
muted
#7C7A82