#4B3781
Closest named color: Dark Slate Blue (#483D8B). oklch(39.9% 0.12 292.6), rgb(75, 55, 129).
Aa
White text reads best on this color (9.71:1).
About this color
#4B3781 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.120 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.022 away. White text reads best on it, at 9.71:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.16:1 |
| White text | 9.71:1 |
Values
| HEX | #4B3781 |
| RGB | rgb(75, 55, 129) |
| HSL | hsl(256, 40%, 36%) |
| OKLCH | oklch(39.9% 0.12 292.6) |
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 #4B3781 | 9.71:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #4B3781 | 2.16:1 | Fails | Lc 11.7 | Not readable |
| #4B3781 text on white | 9.71:1 | AAA | Lc 92.2 | Preferred for body text |
| #4B3781 text on black | 2.16:1 | Fails | Lc -10.2 | Not readable |
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 900.
-
Step 50
50
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#EAE7FA
oklch(93.6% 0.026 293.1)
-
Step 200
200
#D9D4F8
oklch(88.5% 0.049 291.7)
-
Step 300
300
#C2B6F6
oklch(80.9% 0.09 292.9)
-
Step 400
400
#A48EF2
oklch(70.7% 0.144 292.4)
-
Step 500
500
#906EED
oklch(63.2% 0.184 292.7)
-
Step 600
600
#7B52DB
oklch(55.6% 0.199 292.5)
-
Step 700
700
#6841BE
oklch(49.1% 0.186 292.6)
-
Step 800
800
#55379A
oklch(42.8% 0.154 292.7)
-
Step 900
900 (this color)
#4B3781
oklch(39.9% 0.12 292.6)
-
Step 950
950
#281D48
oklch(26.9% 0.077 292.2)
#4B3781 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) | #124583 | 0.075 |
| Deuteranopia (no green cones) | #17437F | 0.071 |
| Tritanopia (no blue cones) | #3D4756 | 0.097 |
| Achromatopsia (no color) | #444444 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B3781
#4B3781
oklch(39.9% 0.12 292.6)
- #484C00
#484C00
oklch(39.9% 0.089 113.2)
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 #4B3781, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.022
- Blueberry #464196 ΔE 0.041
- Rebecca Purple #663399 ΔE 0.064
- Twilight #4E518B ΔE 0.070
- Cobalt #1E488F ΔE 0.071
- Twilight Blue #0A437A ΔE 0.080
- Dusk #4E5481 ΔE 0.081
- Dusk Blue #26538D ΔE 0.084
Use #4B3781 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.