#1B577B#1B577B
#1B577B is a dark, moderate cyan. Relative luminance 0.085; OKLCH L 43.6% C 0.084 H 239.6°. Best body text is #FFFFFF at 7.79:1 contrast (WCAG AA passes).
Color values
| HEX | #1B577B |
|---|---|
| RGB | rgb(27, 87, 123) |
| HSL | hsl(203, 64%, 29%) |
| HSV | hsv(203, 78%, 48%) |
| CMYK | cmyk(78%, 29.3%, 0%, 51.8%) |
| CIE-LAB | lab(34.96, -5.83, -25.79) |
| CIE-LCH | lch(34.96, 26.44, 257.26°) |
| OKLab | oklab(43.64% -0.0427 -0.0729) |
| OKLCH | oklch(43.64% 0.084 239.6) |
| XYZ | xyz(7.4339, 8.4786, 19.9798) |
| Luminance | 0.0848 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Deep Sea Blue
#015482
ΔE00 2.38
Light Navy Blue
#2E5A88
ΔE00 4.64
Light Navy
#155084
ΔE00 4.66
Ugly Blue
#31668A
ΔE00 5.35
Peacock Blue
#016795
ΔE00 5.92
Dark Slate Blue
#214761
ΔE00 5.94
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B577B #7B3F1B
analogous
#1B7B6F #1B577B #1B277B
triadic
#1B577B #7B1B57 #577B1B
tetradic
#1B577B #6F1B7B #7B3F1B #277B1B
square
#1B577B #6F1B7B #7B3F1B #277B1B
split-complementary
#1B577B #7B1B27 #7B6F1B
monochromatic
#061219 #103449 #1B577B #267AAD #3C9BD4
Accessibility & contrast
On white
7.79
#1B577B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.70
#1B577B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B577B
7.79:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B577B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B577B | 1.00 | 7.79 | 2.70 | 7.79 |
| #FFFFFF | 7.79 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.70 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 7.79 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#46577D
Deuteranopia (green-blind)
#394E7A
Tritanopia (blue-blind)
#006064
Achromatopsia (no color)
#525252
Design tokens & code
CSS
--color: #1b577b; /* rgb */ color: rgb(27, 87, 123); /* oklch */ color: oklch(43.6% 0.084 239.6);
Tailwind
colors: {
custom: {
50: '#6686a1',
500: '#1b577b',
950: '#000000',
},
}SCSS
$custom: #1b577b; $custom-light: #6686a1; $custom-dark: #000000;
JSON
{
"hex": "#1b577b",
"rgb": {
"r": 27,
"g": 87,
"b": 123
},
"hsl": {
"h": 202.5,
"s": 64,
"l": 29.412
},
"oklch": {
"l": 0.43642,
"c": 0.08448,
"h": 239.6
},
"luminance": 0.08479
}Semantic roles & 50–950 ramp
primary
#1B577B
secondary
#AF6B43
accent
#7F41E7
background
#F6F8F9
surface
#EBEFF2
border
#C6CACC
text
#070B0F
muted
#7A7C7E