#3F2F8A
Closest named color: Dark Slate Blue (#483D8B). oklch(38% 0.144 285.3), rgb(63, 47, 138).
Aa
White text reads best on this color (10.57:1).
About this color
#3F2F8A is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.144 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.57:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #3F2F8A |
| RGB | rgb(63, 47, 138) |
| HSL | hsl(251, 49%, 36%) |
| OKLCH | oklch(38% 0.144 285.3) |
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 #3F2F8A | 10.57:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #3F2F8A | 1.98:1 | Fails | Lc 9.8 | Not readable |
| #3F2F8A text on white | 10.57:1 | AAA | Lc 94.1 | Preferred for body text |
| #3F2F8A text on black | 1.98:1 | Fails | Lc -8.5 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E7FF
oklch(93.5% 0.032 285.8)
-
Step 200
200
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BAB8FF
oklch(81% 0.1 285.2)
-
Step 400
400
#988FFF
oklch(70.7% 0.16 285.2)
-
Step 500
500
#826DFF
oklch(63% 0.208 285.3)
-
Step 600
600
#6F4AF6
oklch(55.6% 0.241 285.4)
-
Step 700
700
#5E39D6
oklch(49.1% 0.223 285.6)
-
Step 800
800
#4C31AD
oklch(42.7% 0.185 285.5)
-
Step 900
900 (this color)
#3F2F8A
oklch(38% 0.144 285.3)
-
Step 950
950
#241C50
oklch(27% 0.091 285.5)
#3F2F8A 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) | #00418D | 0.070 |
| Deuteranopia (no green cones) | #003C88 | 0.067 |
| Tritanopia (no blue cones) | #204558 | 0.120 |
| Achromatopsia (no color) | #3F3F3F | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2F8A
#3F2F8A
oklch(38% 0.144 285.3)
- #494400
#494400
oklch(38% 0.08 104.9)
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 #3F2F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.050
- Imperial Purple #480CA8 ΔE 0.066
- Sapphire #2138AB ΔE 0.069
- Cobalt #1E488F ΔE 0.070
- Indigo #4B0082 ΔE 0.071
- Indigo Blue #3A18B1 ΔE 0.073
- Rebecca Purple #663399 ΔE 0.078
Use #3F2F8A 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.