#3731AA#3731AA
#3731AA is a dark, vivid blue. Relative luminance 0.059; OKLCH L 40.7% C 0.185 H 276.5°. Best body text is #FFFFFF at 9.62:1 contrast (WCAG AA passes).
Color values
| HEX | #3731AA |
|---|---|
| RGB | rgb(55, 49, 170) |
| HSL | hsl(243, 55%, 43%) |
| HSV | hsv(243, 71%, 67%) |
| CMYK | cmyk(67.6%, 71.2%, 0%, 33.3%) |
| CIE-LAB | lab(29.18, 40.71, -63.69) |
| CIE-LCH | lch(29.18, 75.59, 302.58°) |
| OKLab | oklab(40.68% 0.0209 -0.184) |
| OKLCH | oklch(40.68% 0.185 276.5) |
| XYZ | xyz(9.9272, 5.9103, 38.6401) |
| Luminance | 0.0591 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Sapphire (survey)
#2138AB
ΔE00 3.37
Indigo Blue
#3A18B1
ΔE00 5.07
Ocean Blue
#4F42B5
ΔE00 5.39
Blueberry
#464196
ΔE00 5.94
Blue With A Hint Of Purple
#533CC6
ΔE00 6.00
Blue Blue
#2242C7
ΔE00 6.33
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#3731AA #A4AA31
analogous
#3168AA #3731AA #7331AA
triadic
#3731AA #AA3731 #31AA37
tetradic
#3731AA #AA3168 #A4AA31 #31AA73
square
#3731AA #AA3168 #A4AA31 #31AA73
split-complementary
#3731AA #AA7331 #68AA31
monochromatic
#18164B #28237A #3731AA #534DCC #817CD9
Accessibility & contrast
On white
9.62
#3731AA on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.18
#3731AA on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #3731AA
9.62:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##3731AA | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##3731AA | 1.00 | 9.62 | 2.18 | 9.62 |
| #FFFFFF | 9.62 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.18 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 9.62 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#004AAE
Deuteranopia (green-blind)
#003FA8
Tritanopia (blue-blind)
#00526A
Achromatopsia (no color)
#454545
Design tokens & code
CSS
--color: #3731aa; /* rgb */ color: rgb(55, 49, 170); /* oklch */ color: oklch(40.7% 0.185 276.5);
Tailwind
colors: {
custom: {
50: '#7d6ac4',
500: '#3731aa',
950: '#000000',
},
}SCSS
$custom: #3731aa; $custom-light: #7d6ac4; $custom-dark: #000000;
JSON
{
"hex": "#3731aa",
"rgb": {
"r": 55,
"g": 49,
"b": 170
},
"hsl": {
"h": 242.975,
"s": 55.251,
"l": 42.941
},
"oklch": {
"l": 0.40681,
"c": 0.18515,
"h": 276.5
},
"luminance": 0.05911
}Semantic roles & 50–950 ramp
primary
#3731AA
secondary
#BEC275
accent
#DF49D7
background
#F8F6FC
surface
#EFEBF8
border
#CAC6D1
text
#0B0613
muted
#7C7A82