#3F3683
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.125 284.2), rgb(63, 54, 131).
Aa
White text reads best on this color (10.16:1).
About this color
#3F3683 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.125 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.028 away. White text reads best on it, at 10.16:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.06:1 |
| White text | 10.16:1 |
Values
| HEX | #3F3683 |
| RGB | rgb(63, 54, 131) |
| HSL | hsl(247, 42%, 36%) |
| OKLCH | oklch(38.7% 0.125 284.2) |
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 #3F3683 | 10.16:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #3F3683 | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #3F3683 text on white | 10.16:1 | AAA | Lc 93.3 | Preferred for body text |
| #3F3683 text on black | 2.06:1 | Fails | Lc -9.2 | 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
#F4F4FE
oklch(97% 0.013 286.1)
-
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
#9791FA
oklch(70.7% 0.151 284.4)
-
Step 500
500
#8072F6
oklch(63.1% 0.19 284.3)
-
Step 600
600
#6B56E5
oklch(55.6% 0.207 284.1)
-
Step 700
700
#5A45C7
oklch(49.1% 0.192 284.1)
-
Step 800
800
#493AA1
oklch(42.7% 0.159 284)
-
Step 900
900 (this color)
#3F3683
oklch(38.7% 0.125 284.2)
-
Step 950
950
#231F4B
oklch(27.1% 0.079 283.9)
#3F3683 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) | #004486 | 0.065 |
| Deuteranopia (no green cones) | #003F81 | 0.063 |
| Tritanopia (no blue cones) | #264857 | 0.106 |
| Achromatopsia (no color) | #414141 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3683
#3F3683
oklch(38.7% 0.125 284.2)
- #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 #3F3683, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.028
- Blueberry #464196 ΔE 0.043
- Cobalt #1E488F ΔE 0.059
- Twilight Blue #0A437A ΔE 0.065
- Sapphire #2138AB ΔE 0.076
- Light Navy #155084 ΔE 0.079
- Rebecca Purple #663399 ΔE 0.079
- Twilight #4E518B ΔE 0.080
Use #3F3683 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.