#3F3478
Closest named color: Dark Slate Blue (#483D8B). oklch(37.5% 0.112 287.2), rgb(63, 52, 120).
Aa
White text reads best on this color (10.63:1).
About this color
#3F3478 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.112 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.042 away. White text reads best on it, at 10.63:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #3F3478 |
| RGB | rgb(63, 52, 120) |
| HSL | hsl(250, 40%, 34%) |
| OKLCH | oklch(37.5% 0.112 287.2) |
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 #3F3478 | 10.63:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #3F3478 | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #3F3478 text on white | 10.63:1 | AAA | Lc 94.4 | Preferred for body text |
| #3F3478 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F7
oklch(88.4% 0.047 286.8)
-
Step 300
300
#BCB9F5
oklch(80.9% 0.084 286.6)
-
Step 400
400
#9C92EF
oklch(70.7% 0.134 287.4)
-
Step 500
500
#8574EA
oklch(63.1% 0.172 287)
-
Step 600
600
#7159D8
oklch(55.6% 0.186 287.4)
-
Step 700
700
#5F48BB
oklch(49.1% 0.173 287.4)
-
Step 800
800
#4D3C98
oklch(42.7% 0.144 287.1)
-
Step 900
900 (this color)
#3F3478
oklch(37.5% 0.112 287.2)
-
Step 950
950
#251F47
oklch(26.9% 0.072 287.4)
#3F3478 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) | #10407A | 0.060 |
| Deuteranopia (no green cones) | #103C77 | 0.059 |
| Tritanopia (no blue cones) | #2D4350 | 0.094 |
| Achromatopsia (no color) | #3E3E3E | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3478
#3F3478
oklch(37.5% 0.112 287.2)
- #464300
#464300
oklch(37.4% 0.08 106.8)
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 #3F3478, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.042
- Blueberry #464196 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.065
- Cobalt #1E488F ΔE 0.069
- Marine Blue #01386A ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.079
- Light Navy #155084 ΔE 0.084
- Indigo #4B0082 ΔE 0.084
Use #3F3478 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.