#3F307D
Closest named color: Dark Slate Blue (#483D8B). oklch(37.1% 0.125 287.7), rgb(63, 48, 125).
Aa
White text reads best on this color (10.87:1).
About this color
#3F307D is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.125 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.043 away. White text reads best on it, at 10.87:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #3F307D |
| RGB | rgb(63, 48, 125) |
| HSL | hsl(252, 45%, 34%) |
| OKLCH | oklch(37.1% 0.125 287.7) |
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 #3F307D | 10.87:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #3F307D | 1.93:1 | Fails | Lc 9.0 | Not readable |
| #3F307D text on white | 10.87:1 | AAA | Lc 94.9 | Preferred for body text |
| #3F307D text on black | 1.93:1 | Fails | Lc -7.8 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E8E7FC
oklch(93.5% 0.028 288)
-
Step 200
200
#D6D4FA
oklch(88.4% 0.052 287.7)
-
Step 300
300
#BDB8FA
oklch(81% 0.093 287.6)
-
Step 400
400
#9D8FF8
oklch(70.7% 0.15 288)
-
Step 500
500
#876FF5
oklch(63.1% 0.193 287.8)
-
Step 600
600
#7253E3
oklch(55.5% 0.208 287.5)
-
Step 700
700
#6042C5
oklch(49% 0.193 287.6)
-
Step 800
800
#4E38A0
oklch(42.8% 0.16 287.3)
-
Step 900
900 (this color)
#3F307D
oklch(37.1% 0.125 287.7)
-
Step 950
950
#251E4A
oklch(27% 0.079 287.2)
#3F307D 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) | #003F80 | 0.070 |
| Deuteranopia (no green cones) | #003B7B | 0.069 |
| Tritanopia (no blue cones) | #2A4251 | 0.105 |
| Achromatopsia (no color) | #3D3D3D | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F307D
#3F307D
oklch(37.1% 0.125 287.7)
- #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 #3F307D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.072
- Indigo #4B0082 ΔE 0.073
- Cobalt #1E488F ΔE 0.073
- Marine Blue #01386A ΔE 0.079
- Royal Purple #4B006E ΔE 0.084
- Imperial Purple #480CA8 ΔE 0.085
Use #3F307D 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.