#3F2F8D
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.148 284.8), rgb(63, 47, 141).
Aa
White text reads best on this color (10.48:1).
About this color
#3F2F8D is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.148 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.48:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.00:1 |
| White text | 10.48:1 |
Values
| HEX | #3F2F8D |
| RGB | rgb(63, 47, 141) |
| HSL | hsl(250, 50%, 37%) |
| OKLCH | oklch(38.3% 0.148 284.8) |
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 #3F2F8D | 10.48:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #3F2F8D | 2.00:1 | Fails | Lc 10.1 | Not readable |
| #3F2F8D text on white | 10.48:1 | AAA | Lc 93.8 | Preferred for body text |
| #3F2F8D text on black | 2.00:1 | Fails | Lc -8.7 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E7FF
oklch(93.5% 0.032 285.8)
-
Step 200
200
#D4D5FF
oklch(88.6% 0.058 284.1)
-
Step 300
300
#B9B8FF
oklch(80.9% 0.1 284.6)
-
Step 400
400
#9790FF
oklch(70.8% 0.159 284.4)
-
Step 500
500
#816EFF
oklch(63.1% 0.207 284.7)
-
Step 600
600
#6E48FA
oklch(55.6% 0.247 284.8)
-
Step 700
700
#5D37DA
oklch(49.1% 0.23 284.8)
-
Step 800
800
#4B30B0
oklch(42.7% 0.19 284.7)
-
Step 900
900 (this color)
#3F2F8D
oklch(38.3% 0.148 284.8)
-
Step 950
950
#241C51
oklch(27% 0.093 285.2)
#3F2F8D 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) | #004290 | 0.070 |
| Deuteranopia (no green cones) | #003C8B | 0.066 |
| Tritanopia (no blue cones) | #1D4659 | 0.124 |
| Achromatopsia (no color) | #3F3F3F | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2F8D
#3F2F8D
oklch(38.3% 0.148 284.8)
- #4A4500
#4A4500
oklch(38.3% 0.081 104.9)
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 #3F2F8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.048
- Imperial Purple #480CA8 ΔE 0.062
- Sapphire #2138AB ΔE 0.065
- Indigo Blue #3A18B1 ΔE 0.068
- Cobalt #1E488F ΔE 0.069
- Indigo #4B0082 ΔE 0.072
- Chrysanthemum #560BAD ΔE 0.075
Use #3F2F8D 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.