#1B3B8D#1B3B8D
#1B3B8D is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.142 H 264.4°. Best body text is #FFFFFF at 10.21:1 contrast (WCAG AA passes).
Color values
| HEX | #1B3B8D |
|---|---|
| RGB | rgb(27, 59, 141) |
| HSL | hsl(223, 68%, 33%) |
| HSV | hsv(223, 81%, 55%) |
| CMYK | cmyk(80.9%, 58.2%, 0%, 44.7%) |
| CIE-LAB | lab(27.53, 20.18, -48.80) |
| CIE-LCH | lch(27.53, 52.81, 292.46°) |
| OKLab | oklab(38.26% -0.0137 -0.1409) |
| OKLCH | oklch(38.26% 0.142 264.4) |
| XYZ | xyz(6.8220, 5.2832, 25.8544) |
| Luminance | 0.0528 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Cobalt (survey)
#1E488F
ΔE00 4.54
Darkish Blue
#014182
ΔE00 4.64
Sapphire (survey)
#2138AB
ΔE00 5.13
Cobalt
#0047AB
ΔE00 5.37
Twilight Blue
#0A437A
ΔE00 5.81
Marine Blue
#01386A
ΔE00 6.20
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B3B8D #8D6D1B
analogous
#1B748D #1B3B8D #341B8D
triadic
#1B3B8D #8D1B3B #3B8D1B
tetradic
#1B3B8D #8D1B74 #8D6D1B #1B8D34
square
#1B3B8D #8D1B74 #8D6D1B #1B8D34
split-complementary
#1B3B8D #8D341B #748D1B
monochromatic
#071026 #11265A #1B3B8D #2550C0 #4771DC
Accessibility & contrast
On white
10.21
#1B3B8D on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.06
#1B3B8D on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B3B8D
10.21:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B3B8D | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B3B8D | 1.00 | 10.21 | 2.06 | 10.21 |
| #FFFFFF | 10.21 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.06 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.21 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#004690
Deuteranopia (green-blind)
#003C8B
Tritanopia (blue-blind)
#004F5E
Achromatopsia (no color)
#414141
Design tokens & code
CSS
--color: #1b3b8d; /* rgb */ color: rgb(27, 59, 141); /* oklch */ color: oklch(38.3% 0.142 264.4);
Tailwind
colors: {
custom: {
50: '#6b70af',
500: '#1b3b8d',
950: '#000000',
},
}SCSS
$custom: #1b3b8d; $custom-light: #6b70af; $custom-dark: #000000;
JSON
{
"hex": "#1b3b8d",
"rgb": {
"r": 27,
"g": 59,
"b": 141
},
"hsl": {
"h": 223.158,
"s": 67.857,
"l": 32.941
},
"oklch": {
"l": 0.38256,
"c": 0.14157,
"h": 264.4
},
"luminance": 0.05284
}Semantic roles & 50–950 ramp
primary
#1B3B8D
secondary
#BD9C46
accent
#BA3DEB
background
#F6F6FA
surface
#ECECF5
border
#C7C7CF
text
#080710
muted
#7A7A7F