#21578B#21578B
#21578B is a dark, moderate cyan. Relative luminance 0.090; OKLCH L 44.8% C 0.103 H 250.5°. Best body text is #FFFFFF at 7.50:1 contrast (WCAG AA passes).
Color values
| HEX | #21578B |
|---|---|
| RGB | rgb(33, 87, 139) |
| HSL | hsl(209, 62%, 34%) |
| HSV | hsv(209, 76%, 55%) |
| CMYK | cmyk(76.3%, 37.4%, 0%, 45.5%) |
| CIE-LAB | lab(35.99, 1.19, -33.96) |
| CIE-LCH | lch(35.99, 33.99, 272.00°) |
| OKLab | oklab(44.78% -0.0341 -0.0967) |
| OKLCH | oklch(44.78% 0.103 250.5) |
| XYZ | xyz(8.6938, 9.0028, 25.7006) |
| Luminance | 0.0900 (WCAG relative) |
| Temperature | cool |
| Family | cyan |
Closest named colors
Light Navy Blue
#2E5A88
ΔE00 1.56
Dusk Blue
#26538D
ΔE00 2.27
Light Navy
#155084
ΔE00 2.40
Deep Sea Blue
#015482
ΔE00 3.37
Denim Blue
#3B5B92
ΔE00 4.29
Denim (survey)
#3B638C
ΔE00 4.60
Perceptual scales
Shades
Tints
Tones
OKLCH scale
Color harmonies
complementary
#21578B #8B5521
analogous
#218B8A #21578B #21228B
triadic
#21578B #8B2157 #578B21
tetradic
#21578B #8A218B #8B5521 #228B21
square
#21578B #8A218B #8B5521 #228B21
split-complementary
#21578B #8B2122 #8B8A21
monochromatic
#0A1928 #15385A #21578B #2D76BC #5194D6
Accessibility & contrast
On white
7.50
#21578B on #FFFFFF
AA ✓AA large ✓AAA ✓
On black
2.80
#21578B on #000000
AA ✗AA large ✗AAA ✗
Best text color
#FFFFFF on #21578B
7.50:1 — WCAG AA (normal text) passes
Contrast matrix
| fg \ bg | ##21578B | #FFFFFF | #000000 | ##FFFFFF |
|---|---|---|---|---|
| ##21578B | 1.00 | 7.50 | 2.80 | 7.50 |
| #FFFFFF | 7.50 | 1.00 | 21.00 | 1.00 |
| #000000 | 2.80 | 21.00 | 1.00 | 21.00 |
| ##FFFFFF | 7.50 | 1.00 | 21.00 | 1.00 |
Color blindness preview
Protanopia (red-blind)
#3F5A8D
Deuteranopia (green-blind)
#2F508A
Tritanopia (blue-blind)
#00636A
Achromatopsia (no color)
#555555
Design tokens & code
CSS
--color: #21578b; /* rgb */ color: rgb(33, 87, 139); /* oklch */ color: oklch(44.8% 0.103 250.5);
Tailwind
colors: {
custom: {
50: '#6c86ad',
500: '#21578b',
950: '#000000',
},
}SCSS
$custom: #21578b; $custom-light: #6c86ad; $custom-dark: #000000;
JSON
{
"hex": "#21578b",
"rgb": {
"r": 33,
"g": 87,
"b": 139
},
"hsl": {
"h": 209.434,
"s": 61.628,
"l": 33.725
},
"oklch": {
"l": 0.44783,
"c": 0.10252,
"h": 250.5
},
"luminance": 0.09004
}Semantic roles & 50–950 ramp
primary
#21578B
secondary
#B9834F
accent
#9243E5
background
#F6F8FA
surface
#ECEFF4
border
#C7CACE
text
#080B10
muted
#7A7C7F