#3F3B71
Closest named color: Dark Slate Blue (#483D8B). oklch(38.4% 0.09 284.7), rgb(63, 59, 113).
Aa
White text reads best on this color (10.11:1).
About this color
#3F3B71 is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.090 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.11:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.07:1 |
| White text | 10.11:1 |
Values
| HEX | #3F3B71 |
| RGB | rgb(63, 59, 113) |
| HSL | hsl(244, 31%, 34%) |
| OKLCH | oklch(38.4% 0.09 284.7) |
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 #3F3B71 | 10.11:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #3F3B71 | 2.07:1 | Fails | Lc 10.6 | Not readable |
| #3F3B71 text on white | 10.11:1 | AAA | Lc 93.4 | Preferred for body text |
| #3F3B71 text on black | 2.07:1 | Fails | Lc -9.1 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D6D6F2
oklch(88.5% 0.038 285.6)
-
Step 300
300
#BBBBEB
oklch(80.8% 0.067 284.8)
-
Step 400
400
#9997E1
oklch(70.7% 0.107 284.5)
-
Step 500
500
#827BD9
oklch(63.1% 0.139 285.1)
-
Step 600
600
#6C63C6
oklch(55.7% 0.149 284.6)
-
Step 700
700
#5A51AB
oklch(49% 0.139 284.6)
-
Step 800
800
#4A438B
oklch(42.8% 0.116 284.8)
-
Step 900
900 (this color)
#3F3B71
oklch(38.4% 0.09 284.7)
-
Step 950
950
#242241
oklch(27.1% 0.057 284.9)
#3F3B71 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) | #264373 | 0.038 |
| Deuteranopia (no green cones) | #254070 | 0.038 |
| Tritanopia (no blue cones) | #304650 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3B71
#3F3B71
oklch(38.4% 0.09 284.7)
- #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 #3F3B71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.057
- Blueberry #464196 ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.064
- Cobalt #1E488F ΔE 0.066
- Marine Blue #01386A ΔE 0.070
- Prussian Blue #1D3557 ΔE 0.071
- Light Navy #155084 ΔE 0.071
Use #3F3B71 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.