#3F2A79
Closest named color: Dark Slate Blue (#483D8B). oklch(35.8% 0.128 290.7), rgb(63, 42, 121).
Aa
White text reads best on this color (11.54:1).
About this color
#3F2A79 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.128 and its hue 291°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.058 away. White text reads best on it, at 11.54:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.81:1 |
| White text | 11.54:1 |
Values
| HEX | #3F2A79 |
| RGB | rgb(63, 42, 121) |
| HSL | hsl(256, 48%, 32%) |
| OKLCH | oklch(35.8% 0.128 290.7) |
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 #3F2A79 | 11.54:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #3F2A79 | 1.81:1 | Fails | Lc 7.7 | Not readable |
| #3F2A79 text on white | 11.54:1 | AAA | Lc 96.2 | Preferred for body text |
| #3F2A79 text on black | 1.81:1 | Fails | Lc 0.0 | 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
#E9E7FC
oklch(93.6% 0.028 290.2)
-
Step 200
200
#D8D4FB
oklch(88.5% 0.053 290)
-
Step 300
300
#C0B6FB
oklch(80.9% 0.097 290.7)
-
Step 400
400
#A28DF8
oklch(70.7% 0.153 291)
-
Step 500
500
#8D6CF5
oklch(63.1% 0.197 290.8)
-
Step 600
600
#794FE4
oklch(55.7% 0.214 290.7)
-
Step 700
700
#663EC6
oklch(49.1% 0.199 290.7)
-
Step 800
800
#5335A0
oklch(42.8% 0.164 290.7)
-
Step 900
900 (this color)
#3F2A79
oklch(35.8% 0.128 290.7)
-
Step 950
950
#271D4A
oklch(27% 0.08 290.2)
#3F2A79 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) | #003A7C | 0.074 |
| Deuteranopia (no green cones) | #003777 | 0.074 |
| Tritanopia (no blue cones) | #2D3C4D | 0.103 |
| Achromatopsia (no color) | #393939 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2A79
#3F2A79
oklch(35.8% 0.128 290.7)
- #3F4000
#3F4000
oklch(35.9% 0.079 110.8)
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 #3F2A79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.058
- Indigo #4B0082 ΔE 0.062
- Royal Purple #4B006E ΔE 0.070
- Blueberry #464196 ΔE 0.074
- Marine Blue #01386A ΔE 0.082
- Twilight Blue #0A437A ΔE 0.082
- Midnight Blue #191970 ΔE 0.083
- Imperial Purple #480CA8 ΔE 0.085
Use #3F2A79 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.