#4B3388
Closest named color: Dark Slate Blue (#483D8B). oklch(39.7% 0.135 292.1), rgb(75, 51, 136).
Aa
White text reads best on this color (9.86:1).
About this color
#4B3388 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.135 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.024 away. White text reads best on it, at 9.86:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.135) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.12:1 |
| White text | 9.86:1 |
Values
| HEX | #4B3388 |
| RGB | rgb(75, 51, 136) |
| HSL | hsl(257, 45%, 37%) |
| OKLCH | oklch(39.7% 0.135 292.1) |
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 #4B3388 | 9.86:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #4B3388 | 2.12:1 | Fails | Lc 11.4 | Not readable |
| #4B3388 text on white | 9.86:1 | AAA | Lc 92.5 | Preferred for body text |
| #4B3388 text on black | 2.12:1 | Fails | Lc -9.9 | 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 900.
-
Step 50
50
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#EAE7FC
oklch(93.7% 0.028 292.4)
-
Step 200
200
#D9D3FC
oklch(88.5% 0.056 291.9)
-
Step 300
300
#C2B5FD
oklch(81% 0.101 292.3)
-
Step 400
400
#A48BFC
oklch(70.7% 0.162 291.9)
-
Step 500
500
#9068FA
oklch(63.1% 0.208 292)
-
Step 600
600
#7C49E9
oklch(55.5% 0.227 292)
-
Step 700
700
#6939CA
oklch(49.1% 0.209 292)
-
Step 800
800
#5531A4
oklch(42.7% 0.174 291.7)
-
Step 900
900 (this color)
#4B3388
oklch(39.7% 0.135 292.1)
-
Step 950
950
#291C4C
oklch(27.1% 0.085 292.3)
#4B3388 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) | #00448B | 0.084 |
| Deuteranopia (no green cones) | #004186 | 0.084 |
| Tritanopia (no blue cones) | #3A4658 | 0.109 |
| Achromatopsia (no color) | #434343 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B3388
#4B3388
oklch(39.7% 0.135 292.1)
- #484B00
#484B00
oklch(39.7% 0.088 112.4)
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 #4B3388, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.040
- Rebecca Purple #663399 ΔE 0.058
- Cobalt #1E488F ΔE 0.074
- Imperial Purple #480CA8 ΔE 0.076
- Indigo #4B0082 ΔE 0.077
- Twilight #4E518B ΔE 0.079
- Chrysanthemum #560BAD ΔE 0.080
Use #4B3388 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.