#1B1F99#1B1F99
#1B1F99 is a dark, vivid blue. Relative luminance 0.035; OKLCH L 34.6% C 0.189 H 269.7°. Best body text is #FFFFFF at 12.33:1 contrast (WCAG AA passes).
Color values
| HEX | #1B1F99 |
|---|---|
| RGB | rgb(27, 31, 153) |
| HSL | hsl(238, 70%, 35%) |
| HSV | hsv(238, 82%, 60%) |
| CMYK | cmyk(82.4%, 79.7%, 0%, 40%) |
| CIE-LAB | lab(21.99, 42.70, -65.30) |
| CIE-LCH | lch(21.99, 78.02, 303.18°) |
| OKLab | oklab(34.58% -0.0009 -0.1891) |
| OKLCH | oklch(34.58% 0.189 269.7) |
| XYZ | xyz(6.6898, 3.5121, 30.4561) |
| Luminance | 0.0351 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Royal
#0C1793
ΔE00 2.00
Cobalt Blue
#030AA7
ΔE00 3.71
Royal Blue (survey)
#0504AA
ΔE00 4.31
Indigo Blue
#3A18B1
ΔE00 4.77
Ultramarine
#2000B1
ΔE00 4.95
Darkblue
#00008B
ΔE00 5.61
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B1F99 #99951B
analogous
#1B5E99 #1B1F99 #561B99
triadic
#1B1F99 #991B1F #1F991B
tetradic
#1B1F99 #991B5E #99951B #1B9956
square
#1B1F99 #991B5E #99951B #1B9956
split-complementary
#1B1F99 #99561B #5E991B
monochromatic
#090A31 #121465 #1B1F99 #242ACD #4F53E0
Accessibility & contrast
On white
12.33
#1B1F99 on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.70
#1B1F99 on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B1F99
12.33:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B1F99 | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B1F99 | 1.00 | 12.33 | 1.70 | 12.33 |
| #FFFFFF | 12.33 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.70 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 12.33 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#003B9C
Deuteranopia (green-blind)
#002E97
Tritanopia (blue-blind)
#00455C
Achromatopsia (no color)
#353535
Design tokens & code
CSS
--color: #1b1f99; /* rgb */ color: rgb(27, 31, 153); /* oklch */ color: oklch(34.6% 0.189 269.7);
Tailwind
colors: {
custom: {
50: '#715db8',
500: '#1b1f99',
950: '#000000',
},
}SCSS
$custom: #1b1f99; $custom-light: #715db8; $custom-dark: #000000;
JSON
{
"hex": "#1b1f99",
"rgb": {
"r": 27,
"g": 31,
"b": 153
},
"hsl": {
"h": 238.095,
"s": 70,
"l": 35.294
},
"oklch": {
"l": 0.34577,
"c": 0.18914,
"h": 269.7
},
"luminance": 0.03513
}Semantic roles & 50–950 ramp
primary
#1B1F99
secondary
#C2BF4E
accent
#E73BED
background
#F7F5FB
surface
#EEE9F6
border
#C9C5D0
text
#090412
muted
#7B7981