#4E3791
Closest named color: Dark Slate Blue (#483D8B). oklch(41.4% 0.142 290.6), rgb(78, 55, 145).
Aa
White text reads best on this color (9.21:1).
About this color
#4E3791 is a dark, vivid purple. In OKLCH its lightness is 41%, its chroma 0.142 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.020 away. White text reads best on it, at 9.21:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #4E3791 |
| RGB | rgb(78, 55, 145) |
| HSL | hsl(255, 45%, 39%) |
| OKLCH | oklch(41.4% 0.142 290.6) |
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 #4E3791 | 9.21:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #4E3791 | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #4E3791 text on white | 9.21:1 | AAA | Lc 90.9 | Preferred for body text |
| #4E3791 text on black | 2.27:1 | Fails | Lc -11.5 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E7F9
oklch(93.5% 0.024 291)
-
Step 200
200
#D8D5F6
oklch(88.6% 0.045 289.6)
-
Step 300
300
#C0B8F3
oklch(81% 0.083 290.6)
-
Step 400
400
#A191ED
oklch(70.8% 0.133 290.6)
-
Step 500
500
#8B72E7
oklch(63% 0.17 290.5)
-
Step 600
600
#7757D5
oklch(55.6% 0.185 290.8)
-
Step 700
700
#6447B8
oklch(49.1% 0.17 290.6)
-
Step 800
800 (this color)
#4E3791
oklch(41.4% 0.142 290.6)
-
Step 900
900
#433477
oklch(37.8% 0.11 290.5)
-
Step 950
950
#271F46
oklch(27.1% 0.07 290.3)
#4E3791 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) | #004994 | 0.085 |
| Deuteranopia (no green cones) | #00468F | 0.084 |
| Tritanopia (no blue cones) | #3A4C5E | 0.116 |
| Achromatopsia (no color) | #484848 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4E3791
#4E3791
oklch(41.4% 0.142 290.6)
- #4E4F00
#4E4F00
oklch(41.3% 0.091 110.6)
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 #4E3791, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.020
- Blueberry #464196 ΔE 0.027
- Rebecca Purple #663399 ΔE 0.046
- Twilight #4E518B ΔE 0.070
- Cobalt #1E488F ΔE 0.072
- Chrysanthemum #560BAD ΔE 0.075
- Imperial Purple #480CA8 ΔE 0.075
- Sapphire #2138AB ΔE 0.077
Use #4E3791 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.