#1F377F#1F377F
#1F377F is a dark, vivid blue. Relative luminance 0.046; OKLCH L 36.4% C 0.126 H 266.3°. Best body text is #FFFFFF at 10.99:1 contrast (WCAG AA passes).
Color values
| HEX | #1F377F |
|---|---|
| RGB | rgb(31, 55, 127) |
| HSL | hsl(225, 61%, 31%) |
| HSV | hsv(225, 76%, 50%) |
| CMYK | cmyk(75.6%, 56.7%, 0%, 50.2%) |
| CIE-LAB | lab(25.43, 17.83, -43.48) |
| CIE-LCH | lch(25.43, 46.99, 292.30°) |
| OKLab | oklab(36.37% -0.0082 -0.1252) |
| OKLCH | oklch(36.37% 0.126 266.3) |
| XYZ | xyz(5.7607, 4.5554, 20.6502) |
| Luminance | 0.0456 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Darkish Blue
#014182
ΔE00 5.36
Marine Blue
#01386A
ΔE00 5.49
Marine
#042E60
ΔE00 5.68
Cobalt (survey)
#1E488F
ΔE00 6.00
Twilight Blue
#0A437A
ΔE00 6.32
Sapphire (survey)
#2138AB
ΔE00 6.78
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1F377F #7F671F
analogous
#1F677F #1F377F #371F7F
triadic
#1F377F #7F1F37 #377F1F
tetradic
#1F377F #7F1F67 #7F671F #1F7F37
square
#1F377F #7F1F67 #7F671F #1F7F37
split-complementary
#1F377F #7F371F #677F1F
monochromatic
#070C1D #13224E #1F377F #2B4CB0 #4669D2
Accessibility & contrast
On white
10.99
#1F377F on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
1.91
#1F377F on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1F377F
10.99:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1F377F | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1F377F | 1.00 | 10.99 | 1.91 | 10.99 |
| #FFFFFF | 10.99 | 1.00 | 21.00 | 1.00 |
| #000000 | 1.91 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 10.99 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#004182
Deuteranopia (green-blind)
#00387E
Tritanopia (blue-blind)
#004955
Achromatopsia (no color)
#3C3C3C
Design tokens & code
CSS
--color: #1f377f; /* rgb */ color: rgb(31, 55, 127); /* oklch */ color: oklch(36.4% 0.126 266.3);
Tailwind
colors: {
custom: {
50: '#696da5',
500: '#1f377f',
950: '#000000',
},
}SCSS
$custom: #1f377f; $custom-light: #696da5; $custom-dark: #000000;
JSON
{
"hex": "#1f377f",
"rgb": {
"r": 31,
"g": 55,
"b": 127
},
"hsl": {
"h": 225,
"s": 60.759,
"l": 30.98
},
"oklch": {
"l": 0.36367,
"c": 0.12552,
"h": 266.3
},
"luminance": 0.04556
}Semantic roles & 50–950 ramp
primary
#1F377F
secondary
#B29748
accent
#BC44E4
background
#F6F6FA
surface
#ECEBF4
border
#C7C6CE
text
#07070F
muted
#7A7A7F