#3A3189
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.141 281.9), rgb(58, 49, 137).
Aa
White text reads best on this color (10.60:1).
About this color
#3A3189 is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.141 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.040 away. White text reads best on it, at 10.60:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.60:1 |
Values
| HEX | #3A3189 |
| RGB | rgb(58, 49, 137) |
| HSL | hsl(246, 47%, 36%) |
| OKLCH | oklch(37.9% 0.141 281.9) |
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 #3A3189 | 10.60:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #3A3189 | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #3A3189 text on white | 10.60:1 | AAA | Lc 94.2 | Preferred for body text |
| #3A3189 text on black | 1.98:1 | Fails | Lc -8.4 | 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
#F4F5FF
oklch(97.2% 0.013 281.6)
-
Step 100
100
#E6E8FE
oklch(93.6% 0.03 281.7)
-
Step 200
200
#D2D5FF
oklch(88.4% 0.058 281.9)
-
Step 300
300
#B6B9FF
oklch(80.9% 0.099 282.1)
-
Step 400
400
#9292FF
oklch(70.8% 0.157 281.6)
-
Step 500
500
#7B71FF
oklch(63.1% 0.204 282)
-
Step 600
600
#6750F5
oklch(55.7% 0.234 282)
-
Step 700
700
#563ED6
oklch(49.1% 0.219 281.9)
-
Step 800
800
#4635AD
oklch(42.7% 0.181 281.9)
-
Step 900
900 (this color)
#3A3189
oklch(37.9% 0.141 281.9)
-
Step 950
950
#211E50
oklch(27.1% 0.089 281.4)
#3A3189 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) | #00428C | 0.062 |
| Deuteranopia (no green cones) | #003B87 | 0.058 |
| Tritanopia (no blue cones) | #124758 | 0.121 |
| Achromatopsia (no color) | #3F3F3F | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3189
#3A3189
oklch(37.9% 0.141 281.9)
- #4B4300
#4B4300
oklch(37.9% 0.079 101.7)
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 #3A3189, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.040
- Blueberry #464196 ΔE 0.050
- Cobalt #1E488F ΔE 0.063
- Sapphire #2138AB ΔE 0.065
- Twilight Blue #0A437A ΔE 0.070
- Imperial Purple #480CA8 ΔE 0.072
- Indigo Blue #3A18B1 ΔE 0.074
- Indigo #4B0082 ΔE 0.078
Use #3A3189 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.