#284BA3#284BA3
#284BA3 is a dark, vivid blue. Relative luminance 0.081; OKLCH L 44.0% C 0.148 H 264.6°. Best body text is #FFFFFF at 8.00:1 contrast (WCAG AA passes).
Color values
| HEX | #284BA3 |
|---|---|
| RGB | rgb(40, 75, 163) |
| HSL | hsl(223, 61%, 40%) |
| HSV | hsv(223, 75%, 64%) |
| CMYK | cmyk(75.5%, 54%, 0%, 36.1%) |
| CIE-LAB | lab(34.24, 19.47, -51.26) |
| CIE-LCH | lch(34.24, 54.83, 290.79°) |
| OKLab | oklab(44.01% -0.0139 -0.1476) |
| OKLCH | oklch(44.01% 0.148 264.6) |
| XYZ | xyz(9.9997, 8.1265, 35.6848) |
| Luminance | 0.0813 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Cobalt
#0047AB
ΔE00 2.32
Cobalt (survey)
#1E488F
ΔE00 3.27
Sapphire
#0F52BA
ΔE00 3.87
Dusk Blue
#26538D
ΔE00 4.92
Denim Blue
#3B5B92
ΔE00 5.93
Blue Blue
#2242C7
ΔE00 6.12
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#284BA3 #A38028
analogous
#2888A3 #284BA3 #4328A3
triadic
#284BA3 #A3284B #4BA328
tetradic
#284BA3 #A32888 #A38028 #28A343
square
#284BA3 #A32888 #A38028 #28A343
split-complementary
#284BA3 #A34328 #88A328
monochromatic
#101E41 #1C3472 #284BA3 #3A64CF #6B8BDB
Accessibility & contrast
On white
8.00
#284BA3 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.63
#284BA3 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #284BA3
8.00:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##284BA3 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##284BA3 | 1.00 | 8.00 | 2.63 | 8.00 |
| #FFFFFF | 8.00 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.63 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.00 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0756A6
Deuteranopia (green-blind)
#004BA1
Tritanopia (blue-blind)
#00606F
Achromatopsia (no color)
#515151
Design tokens & code
CSS
--color: #284ba3; /* rgb */ color: rgb(40, 75, 163); /* oklch */ color: oklch(44.0% 0.148 264.6);
Tailwind
colors: {
custom: {
50: '#747cbf',
500: '#284ba3',
950: '#000000',
},
}SCSS
$custom: #284ba3; $custom-light: #747cbf; $custom-dark: #000000;
JSON
{
"hex": "#284ba3",
"rgb": {
"r": 40,
"g": 75,
"b": 163
},
"hsl": {
"h": 222.927,
"s": 60.591,
"l": 39.804
},
"oklch": {
"l": 0.4401,
"c": 0.14828,
"h": 264.6
},
"luminance": 0.08128
}Semantic roles & 50–950 ramp
primary
#284BA3
secondary
#C1A766
accent
#B644E4
background
#F7F7FB
surface
#EEEEF7
border
#C9C9D0
text
#090912
muted
#7B7B81