#4B3B91
Closest named color: Dark Slate Blue (#483D8B). oklch(41.8% 0.136 287.6), rgb(75, 59, 145).
Aa
White text reads best on this color (8.99:1).
About this color
#4B3B91 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.136 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.012 away. White text reads best on it, at 8.99:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #4B3B91 |
| RGB | rgb(75, 59, 145) |
| HSL | hsl(251, 42%, 40%) |
| OKLCH | oklch(41.8% 0.136 287.6) |
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 #4B3B91 | 8.99:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #4B3B91 | 2.33:1 | Fails | Lc 13.6 | Not readable |
| #4B3B91 text on white | 8.99:1 | AAA | Lc 90.3 | Preferred for body text |
| #4B3B91 text on black | 2.33:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E8E8F9
oklch(93.6% 0.023 286)
-
Step 200
200
#D7D5F6
oklch(88.5% 0.045 288.2)
-
Step 300
300
#BDB9F2
oklch(80.9% 0.08 287.7)
-
Step 400
400
#9C93EB
oklch(70.7% 0.127 287.4)
-
Step 500
500
#8676E5
oklch(63.2% 0.162 287.4)
-
Step 600
600
#715BD3
oklch(55.5% 0.177 287.6)
-
Step 700
700
#5F4AB7
oklch(49.1% 0.165 287.6)
-
Step 800
800 (this color)
#4B3B91
oklch(41.8% 0.136 287.6)
-
Step 900
900
#403676
oklch(37.8% 0.105 287.4)
-
Step 950
950
#252045
oklch(27% 0.067 287.2)
#4B3B91 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) | #004B94 | 0.077 |
| Deuteranopia (no green cones) | #00478F | 0.076 |
| Tritanopia (no blue cones) | #344E60 | 0.112 |
| Achromatopsia (no color) | #494949 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B3B91
#4B3B91
oklch(41.8% 0.136 287.6)
- #524F00
#524F00
oklch(41.7% 0.089 107.2)
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 #4B3B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.012
- Blueberry #464196 ΔE 0.017
- Rebecca Purple #663399 ΔE 0.052
- Twilight #4E518B ΔE 0.062
- Cobalt #1E488F ΔE 0.063
- Sapphire #2138AB ΔE 0.074
- Dusk Blue #26538D ΔE 0.076
- Dusk #4E5481 ΔE 0.078
Use #4B3B91 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.