#3D3380
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.125 284.6), rgb(61, 51, 128).
Aa
White text reads best on this color (10.58:1).
About this color
#3D3380 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.125 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.58:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.58:1 |
Values
| HEX | #3D3380 |
| RGB | rgb(61, 51, 128) |
| HSL | hsl(248, 43%, 35%) |
| OKLCH | oklch(37.7% 0.125 284.6) |
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 #3D3380 | 10.58:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #3D3380 | 1.98:1 | Fails | Lc 9.7 | Not readable |
| #3D3380 text on white | 10.58:1 | AAA | Lc 94.2 | Preferred for body text |
| #3D3380 text on black | 1.98:1 | Fails | Lc -8.3 | 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
#F4F4FE
oklch(97% 0.013 286.1)
-
Step 100
100
#E7E8FC
oklch(93.6% 0.027 283.6)
-
Step 200
200
#D5D5FB
oklch(88.5% 0.052 285.3)
-
Step 300
300
#B9B9FB
oklch(80.9% 0.093 284.1)
-
Step 400
400
#9791FA
oklch(70.7% 0.151 284.4)
-
Step 500
500
#8172F7
oklch(63.2% 0.192 284.6)
-
Step 600
600
#6C55E5
oklch(55.5% 0.208 284.6)
-
Step 700
700
#5B44C7
oklch(49% 0.194 284.8)
-
Step 800
800
#4A39A1
oklch(42.6% 0.161 284.8)
-
Step 900
900 (this color)
#3D3380
oklch(37.7% 0.125 284.6)
-
Step 950
950
#231F4B
oklch(27.1% 0.079 283.9)
#3D3380 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) | #004183 | 0.064 |
| Deuteranopia (no green cones) | #003C7E | 0.063 |
| Tritanopia (no blue cones) | #244554 | 0.106 |
| Achromatopsia (no color) | #3F3F3F | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D3380
#3D3380
oklch(37.7% 0.125 284.6)
- #494300
#494300
oklch(37.7% 0.08 103.8)
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 #3D3380, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.052
- Cobalt #1E488F ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
- Marine Blue #01386A ΔE 0.077
- Sapphire #2138AB ΔE 0.080
- Indigo #4B0082 ΔE 0.080
- Light Navy #155084 ΔE 0.085
Use #3D3380 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.