#1B557B#1B557B
#1B557B is a dark, moderate cyan. Relative luminance 0.082; OKLCH L 43.1% C 0.086 H 241.8°. Best body text is #FFFFFF at 7.98:1 contrast (WCAG AA passes).
Color values
| HEX | #1B557B |
|---|---|
| RGB | rgb(27, 85, 123) |
| HSL | hsl(204, 64%, 29%) |
| HSV | hsv(204, 78%, 48%) |
| CMYK | cmyk(78%, 30.9%, 0%, 51.8%) |
| CIE-LAB | lab(34.31, -4.58, -26.80) |
| CIE-LCH | lch(34.31, 27.19, 260.31°) |
| OKLab | oklab(43.13% -0.0406 -0.0759) |
| OKLCH | oklch(43.13% 0.086 241.8) |
| XYZ | xyz(7.2743, 8.1592, 19.9266) |
| Luminance | 0.0816 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Deep Sea Blue
#015482
ΔE00 1.64
Light Navy
#155084
ΔE00 3.59
Light Navy Blue
#2E5A88
ΔE00 4.08
Dusk Blue
#26538D
ΔE00 5.15
Dark Slate Blue
#214761
ΔE00 5.56
Prussian Blue
#004577
ΔE00 5.93
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#1B557B #7B411B
analogous
#1B7B71 #1B557B #1B257B
triadic
#1B557B #7B1B55 #557B1B
tetradic
#1B557B #711B7B #7B411B #257B1B
square
#1B557B #711B7B #7B411B #257B1B
split-complementary
#1B557B #7B1B25 #7B711B
monochromatic
#061119 #103249 #1B557B #2678AD #3C98D4
Accessibility & contrast
On white
7.98
#1B557B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.63
#1B557B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #1B557B
7.98:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##1B557B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##1B557B | 1.00 | 7.98 | 2.63 | 7.98 |
| #FFFFFF | 7.98 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.63 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 7.98 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#43567D
Deuteranopia (green-blind)
#364D7A
Tritanopia (blue-blind)
#005E62
Achromatopsia (no color)
#515151
Design tokens & code
CSS
--color: #1b557b; /* rgb */ color: rgb(27, 85, 123); /* oklch */ color: oklch(43.1% 0.086 241.8);
Tailwind
colors: {
custom: {
50: '#6684a1',
500: '#1b557b',
950: '#000000',
},
}SCSS
$custom: #1b557b; $custom-light: #6684a1; $custom-dark: #000000;
JSON
{
"hex": "#1b557b",
"rgb": {
"r": 27,
"g": 85,
"b": 123
},
"hsl": {
"h": 203.75,
"s": 64,
"l": 29.412
},
"oklch": {
"l": 0.43129,
"c": 0.08607,
"h": 241.8
},
"luminance": 0.0816
}Semantic roles & 50–950 ramp
primary
#1B557B
secondary
#AF6E43
accent
#8341E7
background
#F6F8F9
surface
#EBEFF2
border
#C6CACC
text
#070A0F
muted
#7A7C7E