#4B578B
Closest named color: Dusk (#4E5481). oklch(47% 0.086 272.9), rgb(75, 87, 139).
Aa
White text reads best on this color (6.91:1).
About this color
#4B578B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.086 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.017 away. White text reads best on it, at 6.91:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.03:1 |
| White text | 6.91:1 |
Values
| HEX | #4B578B |
| RGB | rgb(75, 87, 139) |
| HSL | hsl(229, 30%, 42%) |
| OKLCH | oklch(47% 0.086 272.9) |
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 #4B578B | 6.91:1 | AA | Lc -88.8 | Fine for body text |
| Black text on #4B578B | 3.03:1 | AA large text | Lc 20.2 | Dividers and decoration only |
| #4B578B text on white | 6.91:1 | AA | Lc 83.9 | Fine for body text |
| #4B578B text on black | 3.03:1 | AA large text | Lc -18.1 | Dividers and decoration only |
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 700.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D4D8E9
oklch(88.4% 0.024 275.3)
-
Step 300
300
#B7BFDC
oklch(80.8% 0.042 273.2)
-
Step 400
400
#929ECB
oklch(70.6% 0.067 273)
-
Step 500
500
#7886BD
oklch(63.1% 0.085 272.8)
-
Step 600
600
#616FA9
oklch(55.5% 0.092 272.8)
-
Step 700
700 (this color)
#4B578B
oklch(47% 0.086 272.9)
-
Step 800
800
#424C76
oklch(42.7% 0.071 272.9)
-
Step 900
900
#38405F
oklch(37.8% 0.054 272.5)
-
Step 950
950
#212538
oklch(27% 0.036 274.6)
#4B578B 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) | #445D8D | 0.018 |
| Deuteranopia (no green cones) | #3F578A | 0.016 |
| Tritanopia (no blue cones) | #34626A | 0.077 |
| Achromatopsia (no color) | #5A5A5A | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B578B
#4B578B
oklch(47% 0.086 272.9)
- #6C5917
#6C5917
oklch(47% 0.085 92.2)
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 #4B578B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.017
- Twilight #4E518B ΔE 0.017
- Denim Blue #3B5B92 ΔE 0.023
- Dusky Blue #475F94 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.035
- Denim #3B638C ΔE 0.038
- Dusty Grape #545775 ΔE 0.038
- YInMn Blue #415A77 ΔE 0.039
Use #4B578B 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.