#3F3474
Closest named color: Dark Slate Blue (#483D8B). oklch(37.2% 0.106 288), rgb(63, 52, 116).
Aa
White text reads best on this color (10.74:1).
About this color
#3F3474 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.106 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.047 away. White text reads best on it, at 10.74:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #3F3474 |
| RGB | rgb(63, 52, 116) |
| HSL | hsl(250, 38%, 33%) |
| OKLCH | oklch(37.2% 0.106 288) |
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 #3F3474 | 10.74:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #3F3474 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #3F3474 text on white | 10.74:1 | AAA | Lc 94.7 | Preferred for body text |
| #3F3474 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#E9E8F9
oklch(93.7% 0.023 288.7)
-
Step 200
200
#D7D5F5
oklch(88.5% 0.044 288.3)
-
Step 300
300
#BDB9F2
oklch(80.9% 0.08 287.7)
-
Step 400
400
#9D93EB
oklch(70.7% 0.127 287.9)
-
Step 500
500
#8775E4
oklch(63% 0.162 288.3)
-
Step 600
600
#725BD2
oklch(55.6% 0.176 288.2)
-
Step 700
700
#604AB6
oklch(49.1% 0.164 288.2)
-
Step 800
800
#4E3D93
oklch(42.6% 0.136 288.3)
-
Step 900
900 (this color)
#3F3474
oklch(37.2% 0.106 288)
-
Step 950
950
#252045
oklch(27% 0.067 287.2)
#3F3474 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) | #163F76 | 0.056 |
| Deuteranopia (no green cones) | #163C73 | 0.055 |
| Tritanopia (no blue cones) | #2F424E | 0.090 |
| Achromatopsia (no color) | #3E3E3E | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3474
#3F3474
oklch(37.2% 0.106 288)
- #454300
#454300
oklch(37.3% 0.08 107.8)
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 #3F3474, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.047
- Blueberry #464196 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.066
- Marine Blue #01386A ΔE 0.071
- Cobalt #1E488F ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.074
- Dark Grey Blue #29465B ΔE 0.081
- Light Navy #155084 ΔE 0.086
Use #3F3474 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.