#3F3E71
Closest named color: Dark Slate Blue (#483D8B). oklch(39% 0.085 282.6), rgb(63, 62, 113).
Aa
White text reads best on this color (9.81:1).
About this color
#3F3E71 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.085 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.047 away. White text reads best on it, at 9.81:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.13:1 |
| White text | 9.81:1 |
Values
| HEX | #3F3E71 |
| RGB | rgb(63, 62, 113) |
| HSL | hsl(241, 29%, 34%) |
| OKLCH | oklch(39% 0.085 282.6) |
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 #3F3E71 | 9.81:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #3F3E71 | 2.13:1 | Fails | Lc 11.3 | Not readable |
| #3F3E71 text on white | 9.81:1 | AAA | Lc 92.7 | Preferred for body text |
| #3F3E71 text on black | 2.13:1 | Fails | Lc -9.8 | 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
#E8E9F6
oklch(93.7% 0.018 282.5)
-
Step 200
200
#D5D7F1
oklch(88.6% 0.036 282.1)
-
Step 300
300
#BABCE9
oklch(80.9% 0.063 282.9)
-
Step 400
400
#9798DF
oklch(70.6% 0.103 282.8)
-
Step 500
500
#7F7ED5
oklch(63.2% 0.129 282.6)
-
Step 600
600
#6965C3
oklch(55.6% 0.142 282.7)
-
Step 700
700
#5853A8
oklch(49% 0.132 283)
-
Step 800
800
#474588
oklch(42.7% 0.108 282.1)
-
Step 900
900 (this color)
#3F3E71
oklch(39% 0.085 282.6)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#3F3E71 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) | #2B4573 | 0.032 |
| Deuteranopia (no green cones) | #294270 | 0.032 |
| Tritanopia (no blue cones) | #304852 | 0.072 |
| Achromatopsia (no color) | #434343 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3E71
#3F3E71
oklch(39% 0.085 282.6)
- #4E4600
#4E4600
oklch(39% 0.082 102)
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 #3F3E71, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.047
- Twilight Blue #0A437A ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.059
- Cobalt #1E488F ΔE 0.063
- Blueberry #464196 ΔE 0.063
- Light Navy #155084 ΔE 0.065
- Twilight #4E518B ΔE 0.070
- Dusk Blue #26538D ΔE 0.071
Use #3F3E71 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.