#577CBB#577CBB
#577CBB is a mid, moderate blue. Relative luminance 0.200; OKLCH L 58.7% C 0.106 H 260.6°. Best body text is #000000 at 5.01:1 contrast (WCAG AA passes).
Color values
| HEX | #577CBB |
|---|---|
| RGB | rgb(87, 124, 187) |
| HSL | hsl(218, 42%, 54%) |
| HSV | hsv(218, 53%, 73%) |
| CMYK | cmyk(53.5%, 33.7%, 0%, 26.7%) |
| CIE-LAB | lab(51.87, 5.38, -37.09) |
| CIE-LCH | lch(51.87, 37.48, 278.25°) |
| OKLab | oklab(58.66% -0.0174 -0.1046) |
| OKLCH | oklch(58.66% 0.106 260.6) |
| XYZ | xyz(20.1047, 20.0279, 49.8104) |
| Luminance | 0.2003 (WCAG relative) |
| Temperature | cool |
| Family | blue |
Closest named colors
Off Blue
#5684AE
ΔE00 4.70
Windows Blue
#3778BF
ΔE00 4.72
Dusty Blue
#5A86AD
ΔE00 5.28
Cornflower Blue
#5170D7
ΔE00 5.30
Cool Blue
#4984B8
ΔE00 5.40
Steel Blue
#4682B4
ΔE00 5.57
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#577CBB #BB9657
analogous
#57AEBB #577CBB #6457BB
triadic
#577CBB #BB577C #7CBB57
tetradic
#577CBB #BB57AE #BB9657 #57BB64
square
#577CBB #BB57AE #BB9657 #57BB64
split-complementary
#577CBB #BB6457 #AEBB57
monochromatic
#2C436C #3D5F97 #577CBB #839ECD #AEC0DE
Accessibility & contrast
On white
4.20
#577CBB on #FFFFFF
AA ✗AA large ✓AAA ✗
On black
5.01
#577CBB on #000000
AA ✓AA large ✓AAA ✗
Best text color
#000000 on #577CBB
5.01:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##577CBB | #FFFFFF | #000000 | ##000000 |
|---|---|---|---|---|
| ##577CBB | 1.00 | 4.20 | 5.01 | 5.01 |
| #FFFFFF | 4.20 | 1.00 | 21.00 | 21.00 |
| #000000 | 5.01 | 21.00 | 1.00 | 1.00 |
| ##000000 | 5.01 | 21.00 | 1.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#6381BE
Deuteranopia (green-blind)
#5777BA
Tritanopia (blue-blind)
#218A93
Achromatopsia (no color)
#7C7C7C
Design tokens & code
CSS
--color: #577cbb; /* rgb */ color: rgb(87, 124, 187); /* oklch */ color: oklch(58.7% 0.106 260.6);
Tailwind
colors: {
custom: {
50: '#8da1d0',
500: '#577cbb',
950: '#000000',
},
}SCSS
$custom: #577cbb; $custom-light: #8da1d0; $custom-dark: #000000;
JSON
{
"hex": "#577cbb",
"rgb": {
"r": 87,
"g": 124,
"b": 187
},
"hsl": {
"h": 217.8,
"s": 42.373,
"l": 53.725
},
"oklch": {
"l": 0.5866,
"c": 0.106,
"h": 260.6
},
"luminance": 0.20029
}Semantic roles & 50–950 ramp
primary
#577CBB
secondary
#CCBCA2
accent
#A456D2
background
#F9F9FC
surface
#F1F2F9
border
#CBCCD2
text
#0D0E14
muted
#7E7E82