#3F3888
Closest named color: Dark Slate Blue (#483D8B). oklch(39.5% 0.129 282.7), rgb(63, 56, 136).
Aa
White text reads best on this color (9.84:1).
About this color
#3F3888 is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.129 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.021 away. White text reads best on it, at 9.84:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #3F3888 |
| RGB | rgb(63, 56, 136) |
| HSL | hsl(245, 42%, 38%) |
| OKLCH | oklch(39.5% 0.129 282.7) |
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 #3F3888 | 9.84:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #3F3888 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #3F3888 text on white | 9.84:1 | AAA | Lc 92.5 | Preferred for body text |
| #3F3888 text on black | 2.13:1 | Fails | Lc -9.9 | 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
#E7E8FD
oklch(93.7% 0.028 283.7)
-
Step 200
200
#D3D5FC
oklch(88.4% 0.054 282.9)
-
Step 300
300
#B7B9FE
oklch(80.9% 0.097 282.7)
-
Step 400
400
#9492FD
oklch(70.8% 0.154 282.6)
-
Step 500
500
#7D72FB
oklch(63.2% 0.197 282.8)
-
Step 600
600
#6855EA
oklch(55.6% 0.215 282.6)
-
Step 700
700
#5744CC
oklch(49.1% 0.2 282.5)
-
Step 800
800
#4739A5
oklch(42.7% 0.166 282.7)
-
Step 900
900 (this color)
#3F3888
oklch(39.5% 0.129 282.7)
-
Step 950
950
#221F4C
oklch(27% 0.081 282.6)
#3F3888 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) | #00468B | 0.063 |
| Deuteranopia (no green cones) | #004186 | 0.061 |
| Tritanopia (no blue cones) | #214A5A | 0.109 |
| Achromatopsia (no color) | #434343 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3888
#3F3888
oklch(39.5% 0.129 282.7)
- #4F4700
#4F4700
oklch(39.4% 0.082 102.1)
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 #3F3888, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.021
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.053
- Twilight Blue #0A437A ΔE 0.066
- Sapphire #2138AB ΔE 0.069
- Twilight #4E518B ΔE 0.074
- Dusk Blue #26538D ΔE 0.075
- Light Navy #155084 ΔE 0.076
Use #3F3888 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.