#3F2D8A
Closest named color: Dark Slate Blue (#483D8B). oklch(37.7% 0.147 285.9), rgb(63, 45, 138).
Aa
White text reads best on this color (10.74:1).
About this color
#3F2D8A is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.147 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 10.74:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #3F2D8A |
| RGB | rgb(63, 45, 138) |
| HSL | hsl(252, 51%, 36%) |
| OKLCH | oklch(37.7% 0.147 285.9) |
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 #3F2D8A | 10.74:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #3F2D8A | 1.95:1 | Fails | Lc 9.5 | Not readable |
| #3F2D8A text on white | 10.74:1 | AAA | Lc 94.4 | Preferred for body text |
| #3F2D8A text on black | 1.95:1 | Fails | Lc -8.2 | 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
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BAB7FF
oklch(80.8% 0.101 285.8)
-
Step 400
400
#998FFF
oklch(70.7% 0.16 285.6)
-
Step 500
500
#836DFF
oklch(63.1% 0.208 285.7)
-
Step 600
600
#7048F8
oklch(55.6% 0.245 285.7)
-
Step 700
700
#5F37D8
oklch(49.1% 0.227 285.9)
-
Step 800
800
#4D30AE
oklch(42.7% 0.188 285.9)
-
Step 900
900 (this color)
#3F2D8A
oklch(37.7% 0.147 285.9)
-
Step 950
950
#241C51
oklch(27% 0.093 285.2)
#3F2D8A 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) | #00408D | 0.071 |
| Deuteranopia (no green cones) | #003B88 | 0.069 |
| Tritanopia (no blue cones) | #214457 | 0.122 |
| Achromatopsia (no color) | #3E3E3E | 0.148 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2D8A
#3F2D8A
oklch(37.7% 0.147 285.9)
- #484400
#484400
oklch(37.8% 0.081 105.9)
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 #3F2D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.054
- Imperial Purple #480CA8 ΔE 0.063
- Indigo #4B0082 ΔE 0.067
- Sapphire #2138AB ΔE 0.071
- Indigo Blue #3A18B1 ΔE 0.071
- Cobalt #1E488F ΔE 0.074
- Chrysanthemum #560BAD ΔE 0.077
Use #3F2D8A 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.