#3F2F7A
Closest named color: Dark Slate Blue (#483D8B). oklch(36.7% 0.122 288.7), rgb(63, 47, 122).
Aa
White text reads best on this color (11.05:1).
About this color
#3F2F7A is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.122 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.048 away. White text reads best on it, at 11.05:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #3F2F7A |
| RGB | rgb(63, 47, 122) |
| HSL | hsl(253, 44%, 33%) |
| OKLCH | oklch(36.7% 0.122 288.7) |
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 #3F2F7A | 11.05:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #3F2F7A | 1.89:1 | Fails | Lc 8.6 | Not readable |
| #3F2F7A text on white | 11.05:1 | AAA | Lc 95.3 | Preferred for body text |
| #3F2F7A text on black | 1.89:1 | 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
#E9E7FB
oklch(93.5% 0.027 290.5)
-
Step 200
200
#D7D4FA
oklch(88.4% 0.052 288.9)
-
Step 300
300
#BEB7F9
oklch(80.8% 0.093 289)
-
Step 400
400
#9E8FF6
oklch(70.6% 0.148 288.7)
-
Step 500
500
#8970F2
oklch(63.2% 0.187 288.7)
-
Step 600
600
#7453E0
oklch(55.5% 0.204 288.7)
-
Step 700
700
#6243C3
oklch(49.2% 0.189 288.6)
-
Step 800
800
#50389D
oklch(42.7% 0.156 289)
-
Step 900
900 (this color)
#3F2F7A
oklch(36.7% 0.122 288.7)
-
Step 950
950
#261E49
oklch(27% 0.077 288.7)
#3F2F7A 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) | #003D7C | 0.070 |
| Deuteranopia (no green cones) | #003A78 | 0.070 |
| Tritanopia (no blue cones) | #2C404F | 0.101 |
| Achromatopsia (no color) | #3C3C3C | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2F7A
#3F2F7A
oklch(36.7% 0.122 288.7)
- #434200
#434200
oklch(36.8% 0.08 108.8)
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 #3F2F7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.048
- Blueberry #464196 ΔE 0.065
- Indigo #4B0082 ΔE 0.072
- Twilight Blue #0A437A ΔE 0.074
- Cobalt #1E488F ΔE 0.077
- Marine Blue #01386A ΔE 0.078
- Royal Purple #4B006E ΔE 0.080
- Prussian Blue #1D3557 ΔE 0.083
Use #3F2F7A 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.