#3740B1#3740B1
#3740B1 is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.8% C 0.177 H 273.1°. Best body text is #FFFFFF at 8.30:1 contrast (WCAG AA passes).
Color values
| HEX | #3740B1 |
|---|---|
| RGB | rgb(55, 64, 177) |
| HSL | hsl(236, 53%, 45%) |
| HSV | hsv(236, 69%, 69%) |
| CMYK | cmyk(68.9%, 63.8%, 0%, 30.6%) |
| CIE-LAB | lab(33.25, 33.89, -61.21) |
| CIE-LCH | lch(33.25, 69.97, 298.97°) |
| OKLab | oklab(43.82% 0.0095 -0.1767) |
| OKLCH | oklch(43.82% 0.177 273.1) |
| XYZ | xyz(11.3421, 7.6523, 42.4658) |
| Luminance | 0.0765 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Sapphire (survey)
#2138AB
ΔE00 2.97
Blue Blue
#2242C7
ΔE00 3.20
Ocean Blue
#4F42B5
ΔE00 3.50
Blueberry
#464196
ΔE00 4.78
Blue With A Hint Of Purple
#533CC6
ΔE00 5.31
Cobalt
#0047AB
ΔE00 5.86
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#3740B1 #B1A837
analogous
#377DB1 #3740B1 #6B37B1
triadic
#3740B1 #B13740 #40B137
tetradic
#3740B1 #B1377D #B1A837 #37B16B
square
#3740B1 #B1377D #B1A837 #37B16B
split-complementary
#3740B1 #B16B37 #7DB137
monochromatic
#1A1E54 #282F82 #3740B1 #5A62CC #888EDA
Accessibility & contrast
On white
8.30
#3740B1 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.53
#3740B1 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #3740B1
8.30:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##3740B1 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##3740B1 | 1.00 | 8.30 | 2.53 | 8.30 |
| #FFFFFF | 8.30 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.53 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.30 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0054B5
Deuteranopia (green-blind)
#0049AF
Tritanopia (blue-blind)
#005D72
Achromatopsia (no color)
#4E4E4E
Design tokens & code
CSS
--color: #3740b1; /* rgb */ color: rgb(55, 64, 177); /* oklch */ color: oklch(43.8% 0.177 273.1);
Tailwind
colors: {
custom: {
50: '#7e75c9',
500: '#3740b1',
950: '#000000',
},
}SCSS
$custom: #3740b1; $custom-light: #7e75c9; $custom-dark: #000000;
JSON
{
"hex": "#3740b1",
"rgb": {
"r": 55,
"g": 64,
"b": 177
},
"hsl": {
"h": 235.574,
"s": 52.586,
"l": 45.49
},
"oklch": {
"l": 0.43821,
"c": 0.17692,
"h": 273.1
},
"luminance": 0.07653
}Semantic roles & 50–950 ramp
primary
#3740B1
secondary
#C4BF80
accent
#D14CDC
background
#F8F7FC
surface
#EFEDF8
border
#CAC8D1
text
#0B0813
muted
#7C7B82