#3F3D71
Closest named color: Dark Slate Blue (#483D8B). oklch(38.8% 0.087 283.3), rgb(63, 61, 113).
Aa
White text reads best on this color (9.91:1).
About this color
#3F3D71 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.087 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 9.91:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.11:1 |
| White text | 9.91:1 |
Values
| HEX | #3F3D71 |
| RGB | rgb(63, 61, 113) |
| HSL | hsl(242, 30%, 34%) |
| OKLCH | oklch(38.8% 0.087 283.3) |
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 #3F3D71 | 9.91:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #3F3D71 | 2.11:1 | Fails | Lc 11.0 | Not readable |
| #3F3D71 text on white | 9.91:1 | AAA | Lc 92.9 | Preferred for body text |
| #3F3D71 text on black | 2.11:1 | Fails | Lc -9.6 | 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
#BABCEA
oklch(80.9% 0.065 282.9)
-
Step 400
400
#9898E0
oklch(70.8% 0.104 283.4)
-
Step 500
500
#807DD7
oklch(63.2% 0.133 283.4)
-
Step 600
600
#6A64C4
oklch(55.6% 0.145 283.4)
-
Step 700
700
#5953A9
oklch(49.2% 0.133 283.5)
-
Step 800
800
#484489
oklch(42.7% 0.111 283.2)
-
Step 900
900 (this color)
#3F3D71
oklch(38.8% 0.087 283.3)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#3F3D71 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) | #2A4573 | 0.034 |
| Deuteranopia (no green cones) | #284170 | 0.033 |
| Tritanopia (no blue cones) | #304851 | 0.076 |
| Achromatopsia (no color) | #434343 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3D71
#3F3D71
oklch(38.8% 0.087 283.3)
- #4D4600
#4D4600
oklch(38.9% 0.082 103)
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 #3F3D71, 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 0.056
- Dark Grey Blue #29465B ΔE 0.060
- Blueberry #464196 ΔE 0.063
- Cobalt #1E488F ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Marine Blue #01386A ΔE 0.072
- Twilight #4E518B ΔE 0.072
Use #3F3D71 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.