#3F5BCB#3F5BCB
#3F5BCB is a mid, vivid blue. Relative luminance 0.129; OKLCH L 51.5% C 0.176 H 268.8°. Best body text is #FFFFFF at 5.88:1 contrast (WCAG AA passes).
Color values
| HEX | #3F5BCB |
|---|---|
| RGB | rgb(63, 91, 203) |
| HSL | hsl(228, 57%, 52%) |
| HSV | hsv(228, 69%, 80%) |
| CMYK | cmyk(69%, 55.2%, 0%, 20.4%) |
| CIE-LAB | lab(42.53, 26.99, -61.29) |
| CIE-LCH | lch(42.53, 66.97, 293.77°) |
| OKLab | oklab(51.48% -0.0037 -0.1764) |
| OKLCH | oklch(51.48% 0.176 268.8) |
| XYZ | xyz(16.5668, 12.8491, 58.0954) |
| Luminance | 0.1285 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Warm Blue
#4B57DB
ΔE00 3.47
Azul
#1D5DEC
ΔE00 4.15
Sapphire
#0F52BA
ΔE00 5.42
Royal Blue
#4169E1
ΔE00 5.49
Iris
#6258C4
ΔE00 6.01
Denim
#1560BD
ΔE00 6.09
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#3F5BCB #CBAF3F
analogous
#3FA1CB #3F5BCB #693FCB
triadic
#3F5BCB #CB3F5B #5BCB3F
tetradic
#3F5BCB #CB3FA1 #CBAF3F #3FCB69
square
#3F5BCB #CB3FA1 #CBAF3F #3FCB69
split-complementary
#3F5BCB #CB693F #A1CB3F
monochromatic
#1F2F71 #2C43A1 #3F5BCB #6F84D8 #9FADE5
Accessibility & contrast
On white
5.88
#3F5BCB on #FFFFFF
AA ✓AA large ✓AAA ✗
On black
3.57
#3F5BCB on #000000
AA ✗AA large ✓AAA ✗
Best text color
#FFFFFF on #3F5BCB
5.88:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##3F5BCB | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##3F5BCB | 1.00 | 5.88 | 3.57 | 5.88 |
| #FFFFFF | 5.88 | 1.00 | 21.00 | 1.00 |
| #000000 | 3.57 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 5.88 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#006BCF
Deuteranopia (green-blind)
#005EC9
Tritanopia (blue-blind)
#00768A
Achromatopsia (no color)
#646464
Design tokens & code
CSS
--color: #3f5bcb; /* rgb */ color: rgb(63, 91, 203); /* oklch */ color: oklch(51.5% 0.176 268.8);
Tailwind
colors: {
custom: {
50: '#8589dc',
500: '#3f5bcb',
950: '#000000',
},
}SCSS
$custom: #3f5bcb; $custom-light: #8589dc; $custom-dark: #000000;
JSON
{
"hex": "#3f5bcb",
"rgb": {
"r": 63,
"g": 91,
"b": 203
},
"hsl": {
"h": 228,
"s": 57.377,
"l": 52.157
},
"oklch": {
"l": 0.51477,
"c": 0.17646,
"h": 268.8
},
"luminance": 0.12851
}Semantic roles & 50–950 ramp
primary
#3F5BCB
secondary
#D1C594
accent
#C247E1
background
#F8F8FD
surface
#F0EFFB
border
#CBCAD4
text
#0C0B15
muted
#7D7C83