#3F3174
Closest named color: Dark Slate Blue (#483D8B). oklch(36.6% 0.11 289.4), rgb(63, 49, 116).
Aa
White text reads best on this color (11.03:1).
About this color
#3F3174 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.110 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 11.03:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #3F3174 |
| RGB | rgb(63, 49, 116) |
| HSL | hsl(253, 41%, 32%) |
| OKLCH | oklch(36.6% 0.11 289.4) |
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 #3F3174 | 11.03:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #3F3174 | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #3F3174 text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #3F3174 text on black | 1.90:1 | Fails | Lc -7.4 | 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
#E9E8F9
oklch(93.7% 0.023 288.7)
-
Step 200
200
#D8D5F6
oklch(88.6% 0.045 289.6)
-
Step 300
300
#BFB8F3
oklch(80.9% 0.083 289.8)
-
Step 400
400
#9F91ED
oklch(70.6% 0.133 289.5)
-
Step 500
500
#8973E8
oklch(63.1% 0.17 289.2)
-
Step 600
600
#7558D6
oklch(55.6% 0.185 289.6)
-
Step 700
700
#6247B9
oklch(49% 0.172 289.4)
-
Step 800
800
#503B96
oklch(42.6% 0.143 289.6)
-
Step 900
900 (this color)
#3F3174
oklch(36.6% 0.11 289.4)
-
Step 950
950
#261F46
oklch(27% 0.07 289.1)
#3F3174 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) | #0D3D76 | 0.064 |
| Deuteranopia (no green cones) | #0F3A73 | 0.062 |
| Tritanopia (no blue cones) | #2F3F4D | 0.091 |
| Achromatopsia (no color) | #3C3C3C | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3174
#3F3174
oklch(36.6% 0.11 289.4)
- #424200
#424200
oklch(36.7% 0.08 109.8)
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 #3F3174, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Blueberry #464196 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.070
- Marine Blue #01386A ΔE 0.073
- Prussian Blue #1D3557 ΔE 0.075
- Cobalt #1E488F ΔE 0.078
- Indigo #4B0082 ΔE 0.080
- Royal Purple #4B006E ΔE 0.084
Use #3F3174 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.