#5578D8
Closest named color: Royal Blue (#4169E1). oklch(59.4% 0.152 266.7), rgb(85, 120, 216).
Aa
Black text reads best on this color (5.06:1).
About this color
#5578D8 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.152 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.050 away. Black text reads best on it, at 5.06:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #5578D8 |
| RGB | rgb(85, 120, 216) |
| HSL | hsl(224, 63%, 59%) |
| OKLCH | oklch(59.4% 0.152 266.7) |
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 #5578D8 | 4.14:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #5578D8 | 5.06:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #5578D8 text on white | 4.14:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #5578D8 text on black | 5.06:1 | AA | Lc -33.4 | 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 500.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F5
oklch(88.5% 0.041 267.1)
-
Step 300
300
#ABC0F2
oklch(80.9% 0.075 267)
-
Step 400
400
#7F9EEB
oklch(70.8% 0.119 266.7)
-
Step 500
500 (this color)
#5578D8
oklch(59.4% 0.152 266.7)
-
Step 600
600
#476BD3
oklch(55.7% 0.165 266.7)
-
Step 700
700
#3958B6
oklch(49% 0.153 266.9)
-
Step 800
800
#2F4994
oklch(42.8% 0.127 266.6)
-
Step 900
900
#293E76
oklch(37.8% 0.099 266.3)
-
Step 950
950
#182545
oklch(27.1% 0.062 265.8)
#5578D8 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) | #4B83DC | 0.029 |
| Deuteranopia (no green cones) | #3777D6 | 0.029 |
| Tritanopia (no blue cones) | #008E9D | 0.132 |
| Achromatopsia (no color) | #7C7C7C | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5578D8
#5578D8
oklch(59.4% 0.152 266.7)
- #9E7800
#9E7800
oklch(59.4% 0.121 86.3)
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 #5578D8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.050
- Windows Blue #3778BF ΔE 0.050
- Soft Blue #6488EA ΔE 0.052
- Cornflower #6A79F7 ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.057
- Water Blue #0E87CC ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.063
- Clear Blue #247AFD ΔE 0.065
Use #5578D8 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.