#3F3E81
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.11 280.9), rgb(63, 62, 129).
Aa
White text reads best on this color (9.47:1).
About this color
#3F3E81 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.110 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 9.47:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #3F3E81 |
| RGB | rgb(63, 62, 129) |
| HSL | hsl(241, 35%, 37%) |
| OKLCH | oklch(40.1% 0.11 280.9) |
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 #3F3E81 | 9.47:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #3F3E81 | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #3F3E81 text on white | 9.47:1 | AAA | Lc 91.7 | Preferred for body text |
| #3F3E81 text on black | 2.21:1 | Fails | Lc -10.7 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E8FA
oklch(93.5% 0.024 280.9)
-
Step 200
200
#D3D6F8
oklch(88.5% 0.047 281.4)
-
Step 300
300
#B6BBF5
oklch(80.8% 0.082 280.6)
-
Step 400
400
#9296F1
oklch(70.8% 0.132 280.5)
-
Step 500
500
#7A79EB
oklch(63.2% 0.167 280.9)
-
Step 600
600
#655EDA
oklch(55.6% 0.184 281.1)
-
Step 700
700
#544DBD
oklch(49.1% 0.17 280.9)
-
Step 800
800
#444099
oklch(42.7% 0.141 280.6)
-
Step 900
900 (this color)
#3F3E81
oklch(40.1% 0.11 280.9)
-
Step 950
950
#212147
oklch(27% 0.069 280.7)
#3F3E81 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) | #1E4883 | 0.045 |
| Deuteranopia (no green cones) | #194380 | 0.046 |
| Tritanopia (no blue cones) | #264D59 | 0.096 |
| Achromatopsia (no color) | #464646 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3E81
#3F3E81
oklch(40.1% 0.11 280.9)
- #524900
#524900
oklch(40.2% 0.084 101.3)
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 #3F3E81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.047
- Twilight Blue #0A437A ΔE 0.057
- Twilight #4E518B ΔE 0.061
- Light Navy #155084 ΔE 0.062
- Dusk Blue #26538D ΔE 0.062
- Dusk #4E5481 ΔE 0.070
Use #3F3E81 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.