#5578D7
Closest named color: Windows Blue (#3778BF). oklch(59.3% 0.15 266.6), rgb(85, 120, 215).
Aa
Black text reads best on this color (5.05:1).
About this color
#5578D7 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.150 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.049 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #5578D7 |
| RGB | rgb(85, 120, 215) |
| HSL | hsl(224, 62%, 59%) |
| OKLCH | oklch(59.3% 0.15 266.6) |
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 #5578D7 | 4.15:1 | AA large text | Lc -73.9 | Content text, not long reading |
| Black text on #5578D7 | 5.05:1 | AA | Lc 35.7 | Non-text elements, placeholder text |
| #5578D7 text on white | 4.15:1 | AA large text | Lc 68.4 | Content text, not long reading |
| #5578D7 text on black | 5.05:1 | AA | Lc -33.3 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ADC0ED
oklch(80.9% 0.067 267)
-
Step 400
400
#829EE5
oklch(70.7% 0.109 267.2)
-
Step 500
500
#6385DD
oklch(63.2% 0.138 266.6)
-
Step 600
600 (this color)
#5578D7
oklch(59.3% 0.15 266.6)
-
Step 700
700
#3C5AAF
oklch(49% 0.14 266.6)
-
Step 800
800
#324A8E
oklch(42.7% 0.116 266.8)
-
Step 900
900
#2B3E71
oklch(37.5% 0.091 266.7)
-
Step 950
950
#1A2542
oklch(27% 0.056 266.9)
#5578D7 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) | #4C83DB | 0.029 |
| Deuteranopia (no green cones) | #3877D5 | 0.029 |
| Tritanopia (no blue cones) | #008D9D | 0.129 |
| Achromatopsia (no color) | #7C7C7C | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5578D7
#5578D7
oklch(59.3% 0.15 266.6)
- #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 #5578D7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.049
- Royal Blue #4169E1 ΔE 0.051
- Soft Blue #6488EA ΔE 0.053
- Cornflower #6A79F7 ΔE 0.056
- Dark Sky Blue #448EE4 ΔE 0.058
- Water Blue #0E87CC ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.063
- Cool Blue #4984B8 ΔE 0.065
Use #5578D7 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.