#5578CC
Closest named color: Windows Blue (#3778BF). oklch(58.6% 0.135 265.4), rgb(85, 120, 204).
Aa
Black text reads best on this color (4.94:1).
About this color
#5578CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.135 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. Black text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.94:1 |
| White text | 4.24:1 |
Values
| HEX | #5578CC |
| RGB | rgb(85, 120, 204) |
| HSL | hsl(222, 54%, 57%) |
| OKLCH | oklch(58.6% 0.135 265.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #5578CC | 4.24:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #5578CC | 4.94:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #5578CC text on white | 4.24:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #5578CC text on black | 4.94:1 | AA | Lc -32.5 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9F0
oklch(88.4% 0.034 265.2)
-
Step 300
300
#AEC1E9
oklch(81% 0.06 265.1)
-
Step 400
400
#839FDE
oklch(70.6% 0.098 265.6)
-
Step 500
500
#6586D5
oklch(63% 0.125 265.8)
-
Step 600
600 (this color)
#5578CC
oklch(58.6% 0.135 265.4)
-
Step 700
700
#3E5CA7
oklch(49% 0.125 265.6)
-
Step 800
800
#334C88
oklch(42.8% 0.104 265.2)
-
Step 900
900
#2D406D
oklch(37.9% 0.081 265.4)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#5578CC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5481CF | 0.024 |
| Deuteranopia (no green cones) | #4476CA | 0.020 |
| Tritanopia (no blue cones) | #008B98 | 0.120 |
| Achromatopsia (no color) | #7B7B7B | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5578CC
#5578CC
oklch(58.6% 0.135 265.4)
- #9C7500
#9C7500
oklch(58.5% 0.12 85.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #5578CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.053
- Water Blue #0E87CC ΔE 0.056
- Royal Blue #4169E1 ΔE 0.060
- French Blue #436BAD ΔE 0.061
- Soft Blue #6488EA ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.063
Use #5578CC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.