#3F3783
Closest named color: Dark Slate Blue (#483D8B). oklch(38.9% 0.123 283.8), rgb(63, 55, 131).
Aa
White text reads best on this color (10.06:1).
About this color
#3F3783 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.123 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.026 away. White text reads best on it, at 10.06:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.06:1 |
Values
| HEX | #3F3783 |
| RGB | rgb(63, 55, 131) |
| HSL | hsl(246, 41%, 36%) |
| OKLCH | oklch(38.9% 0.123 283.8) |
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 #3F3783 | 10.06:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3F3783 | 2.08:1 | Fails | Lc 10.8 | Not readable |
| #3F3783 text on white | 10.06:1 | AAA | Lc 93.1 | Preferred for body text |
| #3F3783 text on black | 2.08:1 | Fails | Lc -9.4 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E7E8FC
oklch(93.6% 0.027 283.6)
-
Step 200
200
#D4D5FB
oklch(88.4% 0.052 284.1)
-
Step 300
300
#B9B9FB
oklch(80.9% 0.093 284.1)
-
Step 400
400
#9692F9
oklch(70.7% 0.148 283.7)
-
Step 500
500
#7F73F5
oklch(63.1% 0.188 283.8)
-
Step 600
600
#6B57E4
oklch(55.6% 0.205 284)
-
Step 700
700
#5946C6
oklch(49.1% 0.19 283.7)
-
Step 800
800
#493AA0
oklch(42.6% 0.158 284.2)
-
Step 900
900 (this color)
#3F3783
oklch(38.9% 0.123 283.8)
-
Step 950
950
#231F4B
oklch(27.1% 0.079 283.9)
#3F3783 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) | #044486 | 0.062 |
| Deuteranopia (no green cones) | #003F81 | 0.063 |
| Tritanopia (no blue cones) | #254857 | 0.104 |
| Achromatopsia (no color) | #424242 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3783
#3F3783
oklch(38.9% 0.123 283.8)
- #4C4600
#4C4600
oklch(38.8% 0.082 104)
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 #3F3783, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.026
- Blueberry #464196 ΔE 0.041
- Cobalt #1E488F ΔE 0.057
- Twilight Blue #0A437A ΔE 0.064
- Sapphire #2138AB ΔE 0.076
- Light Navy #155084 ΔE 0.077
- Twilight #4E518B ΔE 0.077
- Dusk Blue #26538D ΔE 0.078
Use #3F3783 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.