#3F317E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.125 287.1), rgb(63, 49, 126).
Aa
White text reads best on this color (10.75:1).
About this color
#3F317E is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.125 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.75:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #3F317E |
| RGB | rgb(63, 49, 126) |
| HSL | hsl(251, 44%, 34%) |
| OKLCH | oklch(37.4% 0.125 287.1) |
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 #3F317E | 10.75:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #3F317E | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #3F317E text on white | 10.75:1 | AAA | Lc 94.6 | Preferred for body text |
| #3F317E text on black | 1.95:1 | Fails | Lc -8.0 | 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
#E8E8FC
oklch(93.7% 0.027 285.9)
-
Step 200
200
#D6D5FB
oklch(88.6% 0.052 286.5)
-
Step 300
300
#BCB8FB
oklch(81% 0.094 286.8)
-
Step 400
400
#9C90F8
oklch(70.8% 0.149 287.2)
-
Step 500
500
#8670F5
oklch(63.2% 0.191 287.2)
-
Step 600
600
#7153E4
oklch(55.5% 0.209 287)
-
Step 700
700
#5F42C6
oklch(49% 0.194 287)
-
Step 800
800
#4E38A0
oklch(42.8% 0.16 287.3)
-
Step 900
900 (this color)
#3F317E
oklch(37.4% 0.125 287.1)
-
Step 950
950
#251E4A
oklch(27% 0.079 287.2)
#3F317E 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) | #004081 | 0.069 |
| Deuteranopia (no green cones) | #003C7C | 0.068 |
| Tritanopia (no blue cones) | #2A4352 | 0.105 |
| Achromatopsia (no color) | #3E3E3E | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F317E
#3F317E
oklch(37.4% 0.125 287.1)
- #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 #3F317E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.057
- Cobalt #1E488F ΔE 0.071
- Twilight Blue #0A437A ΔE 0.071
- Indigo #4B0082 ΔE 0.075
- Marine Blue #01386A ΔE 0.079
- Sapphire #2138AB ΔE 0.085
- Imperial Purple #480CA8 ΔE 0.085
Use #3F317E 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.