#3F2F71
Closest named color: Dark Slate Blue (#483D8B). oklch(36% 0.109 291.1), rgb(63, 47, 113).
Aa
White text reads best on this color (11.31:1).
About this color
#3F2F71 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.109 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.057 away. White text reads best on it, at 11.31:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.85:1 |
| White text | 11.31:1 |
Values
| HEX | #3F2F71 |
| RGB | rgb(63, 47, 113) |
| HSL | hsl(255, 41%, 31%) |
| OKLCH | oklch(36% 0.109 291.1) |
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 #3F2F71 | 11.31:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #3F2F71 | 1.85:1 | Fails | Lc 8.0 | Not readable |
| #3F2F71 text on white | 11.31:1 | AAA | Lc 95.9 | Preferred for body text |
| #3F2F71 text on black | 1.85:1 | Fails | Lc 0.0 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E7F9
oklch(93.5% 0.024 291)
-
Step 200
200
#D9D4F6
oklch(88.5% 0.047 292.2)
-
Step 300
300
#C0B8F2
oklch(80.9% 0.081 290.8)
-
Step 400
400
#A191EC
oklch(70.7% 0.131 290.7)
-
Step 500
500
#8C72E5
oklch(63% 0.168 291.2)
-
Step 600
600
#7758D3
oklch(55.6% 0.181 290.9)
-
Step 700
700
#6547B7
oklch(49.1% 0.169 291.2)
-
Step 800
800
#523B94
oklch(42.7% 0.14 291.2)
-
Step 900
900 (this color)
#3F2F71
oklch(36% 0.109 291.1)
-
Step 950
950
#271F45
oklch(27% 0.069 290.8)
#3F2F71 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) | #0C3B73 | 0.066 |
| Deuteranopia (no green cones) | #103970 | 0.063 |
| Tritanopia (no blue cones) | #313D4B | 0.089 |
| Achromatopsia (no color) | #3A3A3A | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2F71
#3F2F71
oklch(36% 0.109 291.1)
- #3F4000
#3F4000
oklch(35.9% 0.079 110.8)
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 #3F2F71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.073
- Marine Blue #01386A ΔE 0.073
- Twilight Blue #0A437A ΔE 0.074
- Blueberry #464196 ΔE 0.076
- Indigo #4B0082 ΔE 0.078
- Royal Purple #4B006E ΔE 0.079
- Marine #042E60 ΔE 0.083
Use #3F2F71 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.