#1B537B#1B537B
#1B537B is a dark, moderate cyan. Relative luminance 0.079; OKLCH L 42.6% C 0.088 H 243.9°. Best body text is #FFFFFF at 8.17:1 contrast (WCAG AA passes).
Color values
| HEX | #1B537B |
|---|---|
| RGB | rgb(27, 83, 123) |
| HSL | hsl(205, 64%, 29%) |
| HSV | hsv(205, 78%, 48%) |
| CMYK | cmyk(78%, 32.5%, 0%, 51.8%) |
| CIE-LAB | lab(33.67, -3.31, -27.82) |
| CIE-LCH | lch(33.67, 28.02, 263.21°) |
| OKLab | oklab(42.62% -0.0386 -0.0788) |
| OKLCH | oklch(42.62% 0.088 243.9) |
| XYZ | xyz(7.1190, 7.8488, 19.8748) |
| Luminance | 0.0785 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Deep Sea Blue
#015482
ΔE00 1.54
Light Navy
#155084
ΔE00 2.61
Light Navy Blue
#2E5A88
ΔE00 3.80
Dusk Blue
#26538D
ΔE00 4.39
Prussian Blue
#004577
ΔE00 4.98
Dark Slate Blue
#214761
ΔE00 5.33
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B537B #7B431B
analogous
#1B7B73 #1B537B #1B237B
triadic
#1B537B #7B1B53 #537B1B
tetradic
#1B537B #731B7B #7B431B #237B1B
square
#1B537B #731B7B #7B431B #237B1B
split-complementary
#1B537B #7B1B23 #7B731B
monochromatic
#061119 #103149 #1B537B #2675AD #3C95D4
Accessibility & contrast
On white
8.17
#1B537B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.57
#1B537B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B537B
8.17:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B537B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B537B | 1.00 | 8.17 | 2.57 | 8.17 |
| #FFFFFF | 8.17 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.57 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 8.17 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#41547D
Deuteranopia (green-blind)
#334B7A
Tritanopia (blue-blind)
#005D61
Achromatopsia (no color)
#4F4F4F
Design tokens & code
CSS
--color: #1b537b; /* rgb */ color: rgb(27, 83, 123); /* oklch */ color: oklch(42.6% 0.088 243.9);
Tailwind
colors: {
custom: {
50: '#6683a1',
500: '#1b537b',
950: '#000000',
},
}SCSS
$custom: #1b537b; $custom-light: #6683a1; $custom-dark: #000000;
JSON
{
"hex": "#1b537b",
"rgb": {
"r": 27,
"g": 83,
"b": 123
},
"hsl": {
"h": 205,
"s": 64,
"l": 29.412
},
"oklch": {
"l": 0.42618,
"c": 0.08779,
"h": 243.9
},
"luminance": 0.0785
}Semantic roles & 50–950 ramp
primary
#1B537B
secondary
#AF7043
accent
#8641E7
background
#F6F7F9
surface
#EBEEF2
border
#C6C9CC
text
#070A0F
muted
#7A7C7E