#1F43BC#1F43BC
#1F43BC is a dark, vivid blue. Relative luminance 0.079; OKLCH L 44.3% C 0.194 H 265.6°. Best body text is #FFFFFF at 8.12:1 contrast (WCAG AA passes).
Color values
| HEX | #1F43BC |
|---|---|
| RGB | rgb(31, 67, 188) |
| HSL | hsl(226, 72%, 43%) |
| HSV | hsv(226, 84%, 74%) |
| CMYK | cmyk(83.5%, 64.4%, 0%, 26.3%) |
| CIE-LAB | lab(33.85, 33.48, -66.78) |
| CIE-LCH | lch(33.85, 74.71, 296.63°) |
| OKLab | oklab(44.26% -0.0147 -0.1934) |
| OKLCH | oklch(44.26% 0.194 265.6) |
| XYZ | xyz(11.6461, 7.9350, 48.4850) |
| Luminance | 0.0794 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Blue Blue
#2242C7
ΔE00 1.67
Sapphire (survey)
#2138AB
ΔE00 3.83
Cobalt
#0047AB
ΔE00 4.07
Blue (survey)
#0343DF
ΔE00 4.32
Sapphire
#0F52BA
ΔE00 5.58
Ocean Blue
#4F42B5
ΔE00 5.67
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1F43BC #BC981F
analogous
#1F91BC #1F43BC #491FBC
triadic
#1F43BC #BC1F43 #43BC1F
tetradic
#1F43BC #BC1F91 #BC981F #1FBC49
square
#1F43BC #BC1F91 #BC981F #1FBC49
split-complementary
#1F43BC #BC491F #91BC1F
monochromatic
#0E1E53 #163087 #1F43BC #3A60DE #6E8AE7
Accessibility & contrast
On white
8.12
#1F43BC on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.59
#1F43BC on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1F43BC
8.12:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1F43BC | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1F43BC | 1.00 | 8.12 | 2.59 | 8.12 |
| #FFFFFF | 8.12 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.59 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.12 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#0057C0
Deuteranopia (green-blind)
#0048BA
Tritanopia (blue-blind)
#006379
Achromatopsia (no color)
#505050
Design tokens & code
CSS
--color: #1f43bc; /* rgb */ color: rgb(31, 67, 188); /* oklch */ color: oklch(44.3% 0.194 265.6);
Tailwind
colors: {
custom: {
50: '#7877d1',
500: '#1f43bc',
950: '#000000',
},
}SCSS
$custom: #1f43bc; $custom-light: #7877d1; $custom-dark: #000000;
JSON
{
"hex": "#1f43bc",
"rgb": {
"r": 31,
"g": 67,
"b": 188
},
"hsl": {
"h": 226.242,
"s": 71.689,
"l": 42.941
},
"oklch": {
"l": 0.44257,
"c": 0.19399,
"h": 265.6
},
"luminance": 0.07936
}Semantic roles & 50–950 ramp
primary
#1F43BC
secondary
#CDB669
accent
#C539EE
background
#F8F7FD
surface
#EFEDFA
border
#CAC8D3
text
#0B0814
muted
#7C7B83